| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <Z7i8Yf-Ic7DDYxOk@vaxr-BM6660-BM6360>
Date: Sat, 22 Feb 2025 01:48:17 +0800
From: I Hsin Cheng <richard120310@...il.com>
To: yury.norov@...il.com
Cc: anshuman.khandual@....com, arnd@...db.de, linux-kernel@...r.kernel.org,
jserv@...s.ncku.edu.tw, skhan@...uxfoundation.org, mka@...omium.org,
akpm@...ux-foundation.org
Subject: Re: [PATCH v2] uapi: Revert "bitops: avoid integer overflow in
GENMASK(_ULL)"
On Fri, Feb 21, 2025 at 03:41:49PM +0800, I Hsin Cheng wrote:
> This patch reverts 'commit c32ee3d9abd2("bitops: avoid integer overflow in
> GENMASK(_ULL)")'.
>
> The code generation can be shrink by over 1k by reverting the commit.
> Orginally the commit claims that clang will emit warnings using the
> implementation at that time.
>
> Numerous tests are done to verify the code size shrink result and
> whether the warnings are emitted.
>
> Signed-off-by: I Hsin Cheng <richard120310@...il.com>
> ---
> Tests performed on ubuntu 24.04 with AMD Ryzen 7 5700X3D 8-Core
> Processor on x86_64 with kernel version v6.14.0-rc1.
>
> Test compilation with gcc-13, gcc-12, gcc-11, gcc cross compiler,
> clang-17, clang-18 and clang-19. No warnings are emitted for W=1 and
> W=2. However, with W=0, many errors and warnings will pop out.
>
> For gcc-13 with W=0:
> In file included from <command-line>:
> ./include/linux/rwsem.h: In function ‘rwsem_assert_held_write_nolockdep’:
> ././include/linux/compiler_types.h:477:20: error: ‘asm’ operand 2 probably does not match constraints [-Werror]
> 477 | #define asm_inline asm __inline
> ...
>
> For clang-19 with W=0:
> ./arch/x86/include/asm/jump_label.h:36:11: error: invalid operand for inline asm constraint 'i'
> 36 | asm goto(ARCH_STATIC_BRANCH_ASM("%c0 + %c1", "%l[l_yes]")
> | ^
> ./arch/x86/include/asm/jump_label.h:26:2: note: expanded from macro 'ARCH_STATIC_BRANCH_ASM'
> 26 | "1: jmp " label " # objtool NOPs this \n\t" \
> ...
>
> However, these errors already exists before applying the change, I don't
> think this patch has anything to do with these errors. I'll send other
> patches to fix these errors.
>
> The following section shows the result of code size shrinking for
> different compilers, architectures and NR_CPUS. Additionally, I use QEMU
> to run an arm64 VM and perform some cpu-heavy workload to make sure no
> side effect or crashes will happen.
>
> * Code size shrinking ( gcc-13 for x86_64 NR_CPUS=64 ):
>
> x$ ./scripts/bloat-o-meter vmlinux_old vmlinux_new
> add/remove: 0/2 grow/shrink: 46/510 up/down: 464/-1733 (-1269)
> Function old new delta
> store_min_perf_pct 275 368 +93
> store_hwp_dynamic_boost 138 225 +87
> store_max_perf_pct 253 336 +83
> rcu_exp_wait_wake 2620 2651 +31
> hybrid_update_cpu_capacity_scaling 311 332 +21
> cpuset_mem_spread_node 283 297 +14
> perf_assign_events 901 914 +13
> xt_init 297 305 +8
> partition_sched_domains_locked 1126 1134 +8
> srcu_torture_stats_print 534 541 +7
> sock_prot_inuse_get 121 128 +7
> ring_buffer_empty 271 278 +7
> numa_policy_init 602 609 +7
> gnet_stats_add_basic 183 190 +7
> rcu_init 2383 2389 +6
> amd_uncore_ctx_move 286 292 +6
> vmalloc_init 1058 1062 +4
> reclaim_throttle 756 760 +4
> kstat_irqs_desc 118 122 +4
> hidinput_connect 20926 20930 +4
> dev_change_proto_down_reason 164 168 +4
> cgroup_propagate_control 403 407 +4
> tracing_total_entries_read 346 349 +3
> remove_siblinginfo 1038 1041 +3
> perf_event_init 838 841 +3
> qdisc_alloc 472 474 +2
> probes_profile_seq_show 387 389 +2
> clocksource_verify_percpu.part 1065 1067 +2
> blk_mq_init_allocated_queue 976 978 +2
> __lru_add_drain_all 502 504 +2
> zone_reclaimable_pages 692 693 +1
> tcp_orphan_count_sum 107 108 +1
> sock_inuse_get 102 103 +1
> sched_balance_rq 3745 3746 +1
> proc_nr_inodes 173 174 +1
> percpu_ref_switch_to_atomic_rcu 375 376 +1
> nr_processes 102 103 +1
> netdev_refcnt_read 102 103 +1
> mq_dump_class_stats 234 235 +1
> mnt_get_writers 96 97 +1
> mnt_get_count 99 100 +1
> get_nr_inodes 106 107 +1
> get_nr_dirty_inodes 153 154 +1
> allow_direct_reclaim 318 319 +1
> alloc_fd 376 377 +1
> __is_kernel_percpu_address 177 178 +1
> zoneinfo_show 823 822 -1
> zhaoxin_pmu_handle_irq 772 771 -1
> zhaoxin_arch_events_quirk 137 136 -1
> workqueue_init 927 926 -1
> wake_up_all_idle_cpus 142 141 -1
> uprobe_buffer_disable 165 164 -1
> update_per_cpu_data_slice_size 216 215 -1
> unregister_netdevice_many_notify 2299 2298 -1
> uncore_pmu_hrtimer 261 260 -1
> uncore_event_cpu_offline 344 343 -1
> uncore_device_to_die 163 162 -1
> tsc_store_and_check_tsc_adjust 507 506 -1
> tsc_restore_sched_clock_state 223 222 -1
> tsc_refine_calibration_work 938 937 -1
> try_to_unmap_one 2473 2472 -1
> try_to_migrate_one 2166 2165 -1
> trace_total_entries 192 191 -1
> trace_buffered_event_enable 347 346 -1
> tmigr_cpu_offline 404 403 -1
> timer_list_start 159 158 -1
> tick_handle_oneshot_broadcast 380 379 -1
> tick_clock_notify 109 108 -1
> tick_broadcast_setup_oneshot 288 287 -1
> thaw_secondary_cpus 424 423 -1
> tcp_sigpool_alloc_ahash 885 884 -1
> tc_fill_qdisc 1125 1124 -1
> sysctl_vm_numa_stat_handler 456 455 -1
> sync_runqueues_membarrier_state 319 318 -1
> sw_perf_event_destroy 133 132 -1
> svc_create_pooled 799 798 -1
> sugov_stop 141 140 -1
> store_no_turbo 641 640 -1
> snmp_fold_field 113 112 -1
> smp_call_function_any 261 260 -1
> show_stat 2323 2322 -1
> setup_swap_info 235 234 -1
> sched_update_numa 424 423 -1
> sbitmap_init_node 498 497 -1
> rto_next_cpu 137 136 -1
> rtm_new_nexthop 5249 5248 -1
> rt6_disable_ip 716 715 -1
> relay_reset 198 197 -1
> relay_flush 198 197 -1
> relay_close 358 357 -1
> reclaim_and_purge_vmap_areas 450 449 -1
> rdmacg_resource_set_max 892 891 -1
> rcu_tasks_trace_pregp_step 1143 1142 -1
> rcu_spawn_gp_kthread 645 644 -1
> rcu_spawn_exp_par_gp_kworker 387 386 -1
> rcu_report_exp_cpu_mult 175 174 -1
> rcu_barrier_tasks_generic 437 436 -1
> rcu_barrier 874 873 -1
> pull_dl_task 845 844 -1
> pti_init 554 553 -1
> print_ICs 299 298 -1
> pfifo_fast_reset 349 348 -1
> perf_trace_event_init 728 727 -1
> perf_reboot 106 105 -1
> perf_event_print_debug 1227 1226 -1
> percpu_counter_set 127 126 -1
> pcpu_setup_first_chunk 2020 2019 -1
> pcpu_depopulate_chunk 412 411 -1
> pcpu_alloc_noprof 1948 1947 -1
> p4_pmu_handle_irq 631 630 -1
> od_set_powersave_bias 216 215 -1
> node_dev_init 189 188 -1
> nh_fill_node 2439 2438 -1
> nfs_show_stats 1147 1146 -1
> neightbl_fill_info.constprop 1064 1063 -1
> native_stop_other_cpus 455 454 -1
> mm_init.isra 898 897 -1
> memory_tier_late_init 1762 1761 -1
> mem_init 520 519 -1
> kswapd_init 110 109 -1
> kmem_cache_init 369 368 -1
> kcompactd_init 242 241 -1
> irq_alloc_matrix 247 246 -1
> ipv6_add_dev 1303 1302 -1
> ipv4_mib_init_net 509 508 -1
> ip_rt_init 589 588 -1
> ip6_route_init 563 562 -1
> iova_domain_init_rcaches 458 457 -1
> iommu_put_dma_cookie 1044 1043 -1
> ioc_timer_fn 4908 4907 -1
> intel_pstate_driver_cleanup 223 222 -1
> intel_gt_mcr_init 886 885 -1
> intel_get_event_constraints 846 845 -1
> intel_arch_events_quirk 137 136 -1
> input_leds_connect 720 719 -1
> init_sched_rt_class 101 100 -1
> init_sched_dl_class 101 100 -1
> init_gi_nodes 132 131 -1
> inet6_net_init 644 643 -1
> i915_pmu_cpu_offline 230 229 -1
> hybrid_set_capacity_of_cpus 137 136 -1
> housekeeping_init 124 123 -1
> group_cpus_evenly 439 438 -1
> gnet_stats_add_queue 213 212 -1
> get_total_entries 199 198 -1
> get_nohz_timer_target 317 316 -1
> gen11_gt_irq_handler 924 923 -1
> free_acpi_perf_data 75 74 -1
> fpu__init_system_xstate 3179 3178 -1
> fold_vm_zone_numa_events 232 231 -1
> flow_limit_cpu_sysctl 525 524 -1
> filelock_init 396 395 -1
> ext4_mb_new_blocks 4028 4027 -1
> elf_coredump_extra_notes_size 107 106 -1
> ehci_hrtimer_func 233 232 -1
> dst_cache_reset_now 163 162 -1
> do_migrate_pages 807 806 -1
> dm_stats_init 195 194 -1
> dl_bw_cpus 136 135 -1
> disable_freq_invariance_workfn 118 117 -1
> default_send_IPI_mask_allbutself_phys 287 286 -1
> crash_prepare_elf64_headers 566 565 -1
> cpupri_init 182 181 -1
> cpupri_find_fitness 416 415 -1
> cpuhp_sysfs_init 265 264 -1
> cpuhp_smt_disable 213 212 -1
> cpuhp_rollback_install 186 185 -1
> cpufreq_set_policy 801 800 -1
> cpufreq_policy_free 385 384 -1
> cpufreq_online 2578 2577 -1
> cpufreq_notify_transition 281 280 -1
> cpufreq_driver_fast_switch 207 206 -1
> cpufreq_dbs_governor_start 443 442 -1
> cpufreq_dbs_governor_init 681 680 -1
> cpudl_init 159 158 -1
> cpuacct_stats_show 380 379 -1
> cpu_map_shared_cache 260 259 -1
> cpu_dev_init 228 227 -1
> cpc_write_ffh 167 166 -1
> compaction_zonelist_suitable 329 328 -1
> clock_was_set 561 560 -1
> cgroup_subtree_control_write 1008 1007 -1
> cgroup_rstat_init 168 167 -1
> cgroup_rstat_boot 105 104 -1
> cgroup_post_fork 634 633 -1
> cgroup_base_stat_cputime_show 760 759 -1
> can_migrate_task 519 518 -1
> call_function_init 171 170 -1
> calibrate_delay_is_known 237 236 -1
> build_all_zonelists_init 277 276 -1
> bpf_prog_alloc 166 165 -1
> blkg_alloc 481 480 -1
> blkcg_print_stat 880 879 -1
> blkcg_iolatency_done_bio 1775 1774 -1
> blkcg_css_alloc 568 567 -1
> blk_stat_timer_fn 378 377 -1
> blk_stat_add_callback 244 243 -1
> blk_mq_sysfs_deinit 123 122 -1
> blk_mq_map_hw_queues 175 174 -1
> blk_mq_init 358 357 -1
> blk_iocost_init 620 619 -1
> begin_new_exec 2857 2856 -1
> asym_cpu_capacity_scan 642 641 -1
> amd_uncore_umc_ctx_init 871 870 -1
> amd_pstate_change_mode_without_dvr_change 133 132 -1
> amd_pmu_v2_handle_irq 1053 1052 -1
> alloc_iova_fast 680 679 -1
> alloc_desc 492 491 -1
> addrconf_disable_policy_idev 322 321 -1
> add_to_avail_list 310 309 -1
> acpi_cpc_valid 130 129 -1
> _vm_unmap_aliases 646 645 -1
> __snmp6_fill_stats64.constprop 282 281 -1
> __percpu_ref_switch_mode 543 542 -1
> __i915_gem_object_set_pages 547 546 -1
> __ftrace_clear_event_pids 593 592 -1
> __drain_swap_slots_cache 90 89 -1
> __drain_all_pages 449 448 -1
> __copy_xstate_to_uabi_buf 2416 2415 -1
> __alloc_frozen_pages_noprof 3930 3929 -1
> ___gnet_stats_copy_basic.isra 387 386 -1
> zone_pcp_enable 127 125 -2
> xhci_bus_resume 1011 1009 -2
> xfrm_input_init 230 228 -2
> xfeature_get_offset 137 135 -2
> x86_release_hardware 322 320 -2
> workqueue_online_cpu 750 748 -2
> workqueue_offline_cpu 550 548 -2
> weighted_interleave_nodes 331 329 -2
> vmalloc_info_show 1000 998 -2
> update_or_create_fnhe 910 908 -2
> update_group_capacity 556 554 -2
> tsc_init 882 880 -2
> try_to_generate_entropy 629 627 -2
> tracing_set_cpumask 284 282 -2
> tracing_release 336 334 -2
> tracing_entries_read 453 451 -2
> trace_rb_cpu_prepare 213 211 -2
> toggle_bp_slot.constprop 2861 2859 -2
> timekeeping_get_mg_floor_swaps 111 109 -2
> tcf_idr_create 639 637 -2
> task_non_contending 837 835 -2
> task_mm_cid_work 498 496 -2
> srcu_readers_active 128 126 -2
> srcu_barrier 515 513 -2
> softirq_init 150 148 -2
> snmp_seq_show_ipstats.isra 374 372 -2
> snmp6_seq_show_item64.constprop 264 262 -2
> snapshot_write_next 2486 2484 -2
> snapshot_read_next 626 624 -2
> smp_prepare_cpus_common 339 337 -2
> skx_pmu_get_topology 313 311 -2
> show_slab_objects 1071 1069 -2
> show_numa_map 980 978 -2
> show_interrupts 817 815 -2
> shmem_cppc_enable 225 223 -2
> setup_zone_pageset 327 325 -2
> setup_per_cpu_pageset 266 264 -2
> set_cpus_allowed_dl 276 274 -2
> set_cpu_sibling_map 1693 1691 -2
> set_buffer_entries 93 91 -2
> seq_hlist_start_percpu 131 129 -2
> seq_hlist_next_percpu 202 200 -2
> send_pcc_cmd 656 654 -2
> select_task_rq_fair 4420 4418 -2
> scsi_show_rq 800 798 -2
> schedule_on_each_cpu 335 333 -2
> s_start 865 863 -2
> ring_buffer_subbuf_order_set 1200 1198 -2
> ring_buffer_overruns 107 105 -2
> ring_buffer_entries 124 122 -2
> recalc_bh_state.part 122 120 -2
> rcu_gp_cleanup 1556 1554 -2
> rcu_check_boost_fail 467 465 -2
> rcec_assoc_rciep.isra 116 114 -2
> pt_init 981 979 -2
> process_srcu 1676 1674 -2
> phys_package_first_cpu 122 120 -2
> perf_output_sample_regs 181 179 -2
> perf_event_mux_interval_ms_store 365 363 -2
> percpu_is_read_locked 126 124 -2
> per_cpu_ptr_to_phys 266 264 -2
> part_stat_read_all 193 191 -2
> part_inflight_show 308 306 -2
> part_in_flight 133 131 -2
> padata_do_serial 237 235 -2
> padata_do_multithreaded 877 875 -2
> padata_alloc_pd 482 480 -2
> p4_pmu_enable_all 132 130 -2
> numa_nearest_node 210 208 -2
> nr_iowait 105 103 -2
> nr_context_switches 112 110 -2
> node_read_distance 234 232 -2
> netif_get_num_default_rss_queues 157 155 -2
> native_smp_cpus_done 657 655 -2
> metadata_dst_alloc_percpu 370 368 -2
> memcpy_count_show 176 174 -2
> membarrier_global_expedited 330 328 -2
> mce_read_aux 394 392 -2
> loopback_get_stats64 145 143 -2
> kyber_timer_fn 599 597 -2
> kvm_flush_tlb_multi 149 147 -2
> kfree_rcu_shrink_count 157 155 -2
> kcore_update_ram.isra 783 781 -2
> iommu_dma_init_fq 450 448 -2
> iolatency_pd_init 495 493 -2
> interleave_nodes 166 164 -2
> interleave_nid 217 215 -2
> intel_pmu_init 14167 14165 -2
> intel_pmu_drain_pebs_icl 866 864 -2
> intel_gt_init_workarounds 4139 4137 -2
> input_register_device 1348 1346 -2
> init_sched_fair_class 213 211 -2
> init_cpu_to_node 284 282 -2
> inactive_task_timer 967 965 -2
> ieee80211_sta_last_active 147 145 -2
> ieee80211_rx_mgmt_beacon 5755 5753 -2
> ieee80211_add_rx_radiotap_header 2267 2265 -2
> idle_threads_init 181 179 -2
> icl_display_core_init 2347 2345 -2
> hw_breakpoint_is_used 210 208 -2
> gro_cells_destroy 342 340 -2
> ftrace_dump_one 731 729 -2
> free_policy_dbs_info 124 122 -2
> free_iova_rcaches 285 283 -2
> free_area_init 4062 4060 -2
> fq_flush_timeout 234 232 -2
> flush_tlb_mm_range 427 425 -2
> ext4_update_super 942 940 -2
> ext4_mb_init 1965 1963 -2
> ext4_journal_commit_callback 470 468 -2
> ext4_fill_super 12856 12854 -2
> drv_change_sta_links 621 619 -2
> drop_slab 223 221 -2
> do_ipt_set_ctl 1565 1563 -2
> do_ip6t_set_ctl 1589 1587 -2
> dma_channel_table_init 279 277 -2
> dm_wait_for_completion 409 407 -2
> dm_stats_message 4382 4380 -2
> dl_cpuset_cpumask_can_shrink 268 266 -2
> dl_clear_root_domain 176 174 -2
> dl_add_task_root_domain 337 335 -2
> dev_lstats_read 137 135 -2
> dev_fetch_sw_netstats 179 177 -2
> detect_cache_attributes 795 793 -2
> del_gendisk 849 847 -2
> default_hugepagesz_setup 454 452 -2
> cpuusage_write 199 197 -2
> cpuusage_user_read 120 118 -2
> cpuusage_sys_read 125 123 -2
> cpuusage_read 111 109 -2
> cpuidle_driver_state_disabled 234 232 -2
> cpufreq_show_cpus 172 170 -2
> cpuacct_all_seq_show 292 290 -2
> cpu_stop_init 178 176 -2
> cpu_rmap_copy_neigh 140 138 -2
> cpu_init_debugfs 277 275 -2
> cppc_allow_fast_switch 133 131 -2
> core_pmu_enable_all 399 397 -2
> cleanup_srcu_struct 424 422 -2
> cgroup_rstat_exit 191 189 -2
> cgroup_release 302 300 -2
> cgroup_exit 416 414 -2
> cgroup_can_fork 1282 1280 -2
> bytes_transferred_show 177 175 -2
> blkcg_reset_stats 481 479 -2
> blk_mq_update_queue_map 192 190 -2
> blk_mq_sysfs_init 158 156 -2
> blk_mq_hw_sysfs_cpus_show 289 287 -2
> arch_tlbbatch_flush 248 246 -2
> arch_enable_hybrid_capacity_scale 241 239 -2
> apply_wqattrs_prepare 502 500 -2
> apply_wqattrs_commit 408 406 -2
> amd_uncore_ctx_init 516 514 -2
> amd_pmu_enable_all 132 130 -2
> amd_pmu_cpu_prepare 340 338 -2
> amd_pmu_check_overflow 177 175 -2
> amd_numa_init 901 899 -2
> amd_detect_prefcore 306 304 -2
> alloc_pages_bulk_mempolicy_noprof 1530 1528 -2
> alloc_cpu_rmap 200 198 -2
> all_vm_events 180 178 -2
> ahci_reset_controller 301 299 -2
> add_del_listener 565 563 -2
> acpi_processor_power_state_has_changed 418 416 -2
> acpi_map_cpuid 147 145 -2
> acpi_get_psd_map 367 365 -2
> acpi_cpufreq_probe 490 488 -2
> _ieee80211_set_active_links 1341 1339 -2
> __zone_set_pageset_high_and_batch 104 102 -2
> __sync_rcu_exp_select_node_cpus 954 952 -2
> __sched_clock_work 261 259 -2
> __percpu_counter_sum 136 134 -2
> __log_error 494 492 -2
> __dm_stat_init_temporary_percpu_totals 443 441 -2
> slabs_cpu_partial_show 326 323 -3
> show_rcu_tasks_generic_gp_kthread 473 470 -3
> show_free_areas 2871 2868 -3
> sched_balance_trigger 923 920 -3
> ring_buffer_reset_online_cpus 323 320 -3
> relay_open 667 664 -3
> register_netdevice 2022 2019 -3
> refresh_zone_stat_thresholds 372 369 -3
> rebind_subsystems 1264 1261 -3
> page_alloc_init_late 754 751 -3
> out_of_memory 1780 1777 -3
> mgts_show 328 325 -3
> init_mm_internals 689 686 -3
> ieee80211_subif_start_xmit 1121 1118 -3
> hugetlb_init 1602 1599 -3
> hugetlb_acct_memory.part 1112 1109 -3
> dm_stat_free 247 244 -3
> crypto_scomp_init_tfm 261 258 -3
> blk_mq_map_queues 213 210 -3
> blk_mq_hw_queue_to_node 123 120 -3
> amd_pmu_cpu_starting 379 376 -3
> update_qos_request 250 246 -4
> tracing_open 955 951 -4
> snmp6_seq_show_item 369 365 -4
> shrink_dcache_sb 327 323 -4
> show_rcu_gp_kthreads 834 830 -4
> set_pgdat_percpu_threshold 182 178 -4
> select_fallback_rq 718 714 -4
> sched_dl_do_global 347 343 -4
> sbitmap_queue_show 405 401 -4
> ring_buffer_reset 230 226 -4
> rcu_tasks_kthread 191 187 -4
> probe_event_enable 862 858 -4
> perf_swevent_init 492 488 -4
> pcpu_populate_chunk 1017 1013 -4
> netstat_seq_show 717 713 -4
> mce_end 651 647 -4
> intel_psr_invalidate 667 663 -4
> intel_pmu_cpu_starting 1706 1702 -4
> intel_dp_compute_link_config 1317 1313 -4
> ieee80211_vif_update_links 2562 2558 -4
> hpet_open 491 487 -4
> housekeeping_setup 617 613 -4
> ext4_attr_show 1006 1002 -4
> elf_coredump_extra_notes_write 453 449 -4
> cpc_read_ffh 89 85 -4
> apply_wqattrs_cleanup.part 233 229 -4
> zone_pcp_reset 178 173 -5
> xt_free_table_info 134 129 -5
> x86_pmu_enable_all 377 372 -5
> wq_affn_dfl_set 253 248 -5
> workqueue_init_topology 271 266 -5
> try_check_zero 438 433 -5
> swapfile_init 220 215 -5
> start_kernel 1996 1991 -5
> sta_get_last_rx_stats 124 119 -5
> smpboot_register_percpu_thread 233 228 -5
> ring_buffer_free 145 140 -5
> release_callchain_buffers_rcu 111 106 -5
> rcu_dump_cpu_stacks 433 428 -5
> padata_do_parallel 532 527 -5
> load_module 9704 9699 -5
> kvm_alloc_cpumask 177 172 -5
> kvfree_rcu_init 571 566 -5
> gro_cells_init 257 252 -5
> free_fair_sched_group 162 157 -5
> dst_cache_destroy 141 136 -5
> cpuhp_smt_enable 243 238 -5
> cgroup_print_ss_mask 182 177 -5
> alloc_buffer 1345 1340 -5
> __list_lru_init 179 174 -5
> __group_cpus_evenly 1254 1249 -5
> __fib6_drop_pcpu_from.part 209 204 -5
> x86_pmu_disable_all 411 405 -6
> trace_empty 233 227 -6
> tcp_v4_init 273 267 -6
> svc_seq_show 328 322 -6
> snmp_seq_show_tcp_udp.isra 942 936 -6
> schedstat_next 131 125 -6
> ring_buffer_wake_waiters 191 185 -6
> perf_event_exit_cpu_context 600 594 -6
> percpu_down_write 400 394 -6
> pcpu_free_pages.isra 169 163 -6
> pcpu_build_alloc_info 1307 1301 -6
> packet_read_pending.isra 105 99 -6
> nv_get_stats64 402 396 -6
> net_dev_init 795 789 -6
> kvm_smp_send_call_func_ipi 100 94 -6
> irq_migrate_all_off_this_cpu 722 716 -6
> intel_engines_init_mmio 3432 3426 -6
> init_timers 170 164 -6
> icmpv6_init 289 283 -6
> dma_channel_rebalance 788 782 -6
> dl_bw_manage 805 799 -6
> cpufreq_dbs_governor_stop 142 136 -6
> blk_mq_map_swqueue 1057 1051 -6
> acpi_processor_throttling_init 788 782 -6
> __percpu_counter_limited_add 481 475 -6
> __do_sys_swapon 4260 4254 -6
> __cpuacct_percpu_seq_show 163 157 -6
> wq_update_node_max_active 529 522 -7
> sysrq_timer_list_show 277 270 -7
> smpboot_destroy_threads 150 143 -7
> smp_call_function_many_cond 1320 1313 -7
> setup_cpu_entry_areas 932 925 -7
> regmap_field_init 122 115 -7
> mst_stream_compute_config 1659 1652 -7
> lpit_read_residency_counter_us 309 302 -7
> free_node_nr_active 165 158 -7
> dl_server_apply_params 972 965 -7
> cpu_down_maps_locked 203 196 -7
> alloc_workqueue 2078 2071 -7
> __is_module_percpu_address 283 276 -7
> sta_set_sinfo 3014 3006 -8
> show_softirqs 334 326 -8
> populate_cache_leaves 1389 1381 -8
> is_mddev_idle 471 463 -8
> irq_matrix_reserve_managed 350 342 -8
> intel_psr_flush 982 974 -8
> get_callchain_buffers 414 406 -8
> find_next_best_node 275 267 -8
> drv_change_vif_links 635 627 -8
> core_guest_get_msrs 347 339 -8
> check_hw_exists 1074 1066 -8
> __do_sys_swapoff 3766 3758 -8
> __dl_server_attach_root 238 230 -8
> x86_reserve_hardware 680 671 -9
> smp_shutdown_nonboot_cpus 198 189 -9
> schedstat_start 125 116 -9
> do_kmem_cache_create 1252 1243 -9
> cache_shared_cpu_map_remove 340 331 -9
> bioset_exit 381 372 -9
> reserve_ds_buffers 1595 1585 -10
> hugetlb_cgroup_free 127 117 -10
> flush_all_cpus_locked 349 339 -10
> cpu_rmap_update 573 563 -10
> compaction_proactiveness_sysctl_handler 298 288 -10
> ahci_save_initial_config 1170 1160 -10
> __build_all_zonelists 229 219 -10
> numa_set_distance 578 567 -11
> init_pod_type 588 577 -11
> del_from_avail_list 220 209 -11
> weighted_interleave_nid 385 373 -12
> sched_dl_overflow 1326 1314 -12
> rcu_sched_clock_irq 4343 4331 -12
> icmp_init 286 274 -12
> hugetlb_cgroup_read_numa_stat 607 595 -12
> acpi_processor_preregister_performance 1174 1162 -12
> sysctl_compaction_handler 196 183 -13
> release_ds_buffers 310 297 -13
> mempolicy_sysfs_init 664 651 -13
> intel_drrs_activate 392 379 -13
> cgroup_migrate_execute 1151 1138 -13
> sched_init_numa 1916 1902 -14
> dev_get_stats 816 802 -14
> __reserve_bp_slot 679 664 -15
> dl_task_timer 1511 1495 -16
> __pfx_intel_pstate_update_policies 16 - -16
> numa_init 729 712 -17
> __acpi_processor_set_throttling 1132 1112 -20
> ring_buffer_resize 1319 1292 -27
> cppc_perf_ctrs_in_pcc 309 276 -33
> intel_pstate_update_policies 90 - -90
> Total: Before=22438085, After=22436816, chg -0.01%
>
> * Code size shrkinking ( gcc-12 for x86_64 NR_CPUS=64 ):
>
> $ ./scripts/bloat-o-meter vmlinux_old vmlinux_new
> add/remove: 4/4 grow/shrink: 57/500 up/down: 1026/-2028 (-1002)
> Function old new delta
> lpit_read_residency_counter_us - 302 +302
> trace_total_entries 107 208 +101
> get_total_entries_cpu - 101 +101
> store_min_perf_pct 275 368 +93
> store_hwp_dynamic_boost 138 225 +87
> store_max_perf_pct 253 336 +83
> alloc_pages_bulk_mempolicy_noprof 1556 1589 +33
> rcu_exp_wait_wake 2620 2651 +31
> hybrid_update_cpu_capacity_scaling 311 332 +21
> __pfx_lpit_read_residency_counter_us - 16 +16
> __pfx_get_total_entries_cpu - 16 +16
> get_total_entries 203 215 +12
> apply_wqattrs_prepare 516 524 +8
> sock_prot_inuse_get 121 128 +7
> ring_buffer_empty 271 278 +7
> numa_policy_init 602 609 +7
> gnet_stats_add_basic 183 190 +7
> amd_uncore_ctx_move 286 292 +6
> rebind_subsystems 1261 1266 +5
> blk_mq_flush_busy_ctxs 463 468 +5
> __i915_gem_object_set_pages 545 550 +5
> select_task_rq_fair 4447 4451 +4
> reclaim_throttle 756 760 +4
> rcu_init 2387 2391 +4
> kstat_irqs_desc 118 122 +4
> dev_change_proto_down_reason 164 168 +4
> calibrate_delay_is_known 237 241 +4
> x86_reserve_hardware 648 651 +3
> tracing_total_entries_read 346 349 +3
> remove_siblinginfo 1038 1041 +3
> cpuset_mem_spread_node 297 300 +3
> qdisc_alloc 472 474 +2
> probes_profile_seq_show 387 389 +2
> low_power_idle_cpu_residency_us_show 100 102 +2
> clocksource_verify_percpu.part 1071 1073 +2
> cgroup_propagate_control 405 407 +2
> blk_mq_init_allocated_queue 976 978 +2
> __lru_add_drain_all 502 504 +2
> zone_reclaimable_pages 692 693 +1
> tcp_orphan_count_sum 107 108 +1
> srcu_torture_stats_print 537 538 +1
> sock_inuse_get 102 103 +1
> sched_balance_rq 3682 3683 +1
> proc_nr_inodes 173 174 +1
> percpu_ref_switch_to_atomic_rcu 370 371 +1
> nr_processes 102 103 +1
> netdev_refcnt_read 102 103 +1
> mq_dump_class_stats 234 235 +1
> mnt_get_writers 96 97 +1
> mnt_get_count 99 100 +1
> intel_engines_init_mmio 3389 3390 +1
> input_register_device 1291 1292 +1
> ieee80211_rx_mgmt_beacon 6109 6110 +1
> hpet_open 491 492 +1
> get_nr_inodes 106 107 +1
> get_nr_dirty_inodes 153 154 +1
> cache_shared_cpu_map_remove 297 298 +1
> allow_direct_reclaim 318 319 +1
> alloc_fd 376 377 +1
> acpi_extract_apple_properties 973 974 +1
> __is_kernel_percpu_address 177 178 +1
> zoneinfo_show 823 822 -1
> zhaoxin_pmu_handle_irq 776 775 -1
> zhaoxin_arch_events_quirk 137 136 -1
> xt_init 297 296 -1
> x86_pmu_handle_irq 484 483 -1
> x86_pmu_enable_all 382 381 -1
> wake_up_all_idle_cpus 142 141 -1
> uprobe_buffer_disable 165 164 -1
> update_per_cpu_data_slice_size 216 215 -1
> unregister_netdevice_many_notify 2299 2298 -1
> uncore_pmu_hrtimer 261 260 -1
> uncore_event_cpu_offline 349 348 -1
> uncore_device_to_die 163 162 -1
> tsc_store_and_check_tsc_adjust 507 506 -1
> tsc_restore_sched_clock_state 223 222 -1
> tsc_refine_calibration_work 938 937 -1
> try_to_unmap_one 2485 2484 -1
> try_to_migrate_one 2162 2161 -1
> trace_buffered_event_enable 347 346 -1
> tmigr_cpu_offline 404 403 -1
> timer_list_start 159 158 -1
> tick_handle_oneshot_broadcast 380 379 -1
> tick_clock_notify 109 108 -1
> tick_broadcast_setup_oneshot 288 287 -1
> thaw_secondary_cpus 424 423 -1
> tcp_sigpool_alloc_ahash 934 933 -1
> tc_fill_qdisc 1125 1124 -1
> sysctl_vm_numa_stat_handler 456 455 -1
> sync_runqueues_membarrier_state 319 318 -1
> sw_perf_event_destroy 133 132 -1
> svc_create_pooled 807 806 -1
> sugov_stop 141 140 -1
> store_no_turbo 653 652 -1
> snmp_fold_field 113 112 -1
> smp_call_function_any 261 260 -1
> show_stat 2316 2315 -1
> show_rcu_tasks_generic_gp_kthread 455 454 -1
> setup_swap_info 235 234 -1
> sched_update_numa 426 425 -1
> sbitmap_init_node 498 497 -1
> rto_next_cpu 137 136 -1
> rtm_new_nexthop 5400 5399 -1
> rt6_disable_ip 716 715 -1
> relay_reset 198 197 -1
> relay_flush 198 197 -1
> relay_close 358 357 -1
> reclaim_and_purge_vmap_areas 450 449 -1
> rdmacg_resource_set_max 894 893 -1
> rcu_tasks_trace_pregp_step 1143 1142 -1
> rcu_spawn_gp_kthread 645 644 -1
> rcu_spawn_exp_par_gp_kworker 387 386 -1
> rcu_report_exp_cpu_mult 175 174 -1
> rcu_barrier_tasks_generic 463 462 -1
> rcu_barrier 874 873 -1
> pull_dl_task 845 844 -1
> pti_init 535 534 -1
> print_ICs 299 298 -1
> pfifo_fast_reset 349 348 -1
> perf_trace_event_init 735 734 -1
> perf_reboot 106 105 -1
> perf_event_print_debug 1219 1218 -1
> percpu_counter_set 127 126 -1
> pcpu_setup_first_chunk 1989 1988 -1
> pcpu_free_pages.constprop 176 175 -1
> pcpu_depopulate_chunk 412 411 -1
> pcpu_alloc_noprof 1945 1944 -1
> partition_sched_domains_locked 1127 1126 -1
> p4_pmu_handle_irq 682 681 -1
> od_set_powersave_bias 216 215 -1
> node_dev_init 189 188 -1
> nh_fill_node 2439 2438 -1
> nfs_show_stats 1147 1146 -1
> netstat_seq_show 720 719 -1
> neightbl_fill_info.constprop 1064 1063 -1
> native_stop_other_cpus 421 420 -1
> mm_init.constprop 898 897 -1
> memory_tier_late_init 1763 1762 -1
> mem_init 520 519 -1
> kswapd_init 110 109 -1
> kmem_cache_init 369 368 -1
> kcompactd_init 242 241 -1
> irq_alloc_matrix 247 246 -1
> ipv6_add_dev 1303 1302 -1
> ipv4_mib_init_net 509 508 -1
> ip_rt_init 589 588 -1
> ip6_route_init 563 562 -1
> iova_domain_init_rcaches 458 457 -1
> intel_pstate_driver_cleanup 223 222 -1
> intel_gt_mcr_init 886 885 -1
> intel_get_event_constraints 846 845 -1
> intel_arch_events_quirk 137 136 -1
> input_leds_connect 724 723 -1
> init_sched_rt_class 101 100 -1
> init_sched_dl_class 101 100 -1
> init_gi_nodes 132 131 -1
> inet6_net_init 651 650 -1
> ieee80211_subif_start_xmit 1127 1126 -1
> i915_pmu_cpu_offline 230 229 -1
> hybrid_set_capacity_of_cpus 137 136 -1
> housekeeping_init 124 123 -1
> group_cpus_evenly 430 429 -1
> gnet_stats_add_queue 213 212 -1
> gen11_gt_irq_handler 911 910 -1
> free_acpi_perf_data 75 74 -1
> fold_vm_zone_numa_events 232 231 -1
> flow_limit_cpu_sysctl 525 524 -1
> filelock_init 396 395 -1
> elf_coredump_extra_notes_size 107 106 -1
> dst_cache_reset_now 163 162 -1
> do_migrate_pages 807 806 -1
> dm_stats_init 195 194 -1
> dl_cpuset_cpumask_can_shrink 267 266 -1
> dl_bw_cpus 136 135 -1
> disable_freq_invariance_workfn 118 117 -1
> default_send_IPI_mask_allbutself_phys 287 286 -1
> crash_prepare_elf64_headers 566 565 -1
> cpupri_init 182 181 -1
> cpupri_find_fitness 416 415 -1
> cpuhp_sysfs_init 265 264 -1
> cpuhp_smt_disable 213 212 -1
> cpuhp_rollback_install 186 185 -1
> cpufreq_set_policy 801 800 -1
> cpufreq_policy_free 385 384 -1
> cpufreq_online 2578 2577 -1
> cpufreq_dbs_governor_start 443 442 -1
> cpufreq_dbs_governor_init 681 680 -1
> cpudl_init 159 158 -1
> cpuacct_stats_show 380 379 -1
> cpu_map_shared_cache 260 259 -1
> cpu_dev_init 228 227 -1
> cpc_write_ffh 167 166 -1
> compaction_zonelist_suitable 329 328 -1
> clock_was_set 561 560 -1
> cgroup_subtree_control_write 997 996 -1
> cgroup_rstat_init 168 167 -1
> cgroup_rstat_boot 105 104 -1
> cgroup_print_ss_mask 182 181 -1
> cgroup_post_fork 614 613 -1
> cgroup_base_stat_cputime_show 760 759 -1
> can_migrate_task 519 518 -1
> call_function_init 171 170 -1
> build_all_zonelists_init 277 276 -1
> bpf_prog_alloc 166 165 -1
> blkg_alloc 481 480 -1
> blkcg_print_stat 880 879 -1
> blkcg_iolatency_done_bio 1826 1825 -1
> blkcg_css_alloc 568 567 -1
> blk_stat_timer_fn 372 371 -1
> blk_stat_add_callback 249 248 -1
> blk_mq_sysfs_deinit 123 122 -1
> blk_mq_map_hw_queues 175 174 -1
> blk_mq_init 358 357 -1
> blk_iocost_init 621 620 -1
> begin_new_exec 2860 2859 -1
> asym_cpu_capacity_scan 605 604 -1
> amd_uncore_umc_ctx_init 896 895 -1
> amd_pstate_change_mode_without_dvr_change 133 132 -1
> amd_pmu_v2_handle_irq 1101 1100 -1
> amd_pmu_enable_all 139 138 -1
> alloc_iova_fast 680 679 -1
> alloc_desc 492 491 -1
> ahci_save_initial_config 1164 1163 -1
> addrconf_disable_policy_idev 322 321 -1
> add_to_avail_list 310 309 -1
> acpi_cpc_valid 130 129 -1
> _vm_unmap_aliases 647 646 -1
> __percpu_ref_switch_mode 543 542 -1
> __ftrace_clear_event_pids 605 604 -1
> __drain_swap_slots_cache 90 89 -1
> __drain_all_pages 449 448 -1
> __dm_stat_init_temporary_percpu_totals 442 441 -1
> __copy_xstate_to_uabi_buf 2457 2456 -1
> __alloc_frozen_pages_noprof 4020 4019 -1
> ___gnet_stats_copy_basic.isra 387 386 -1
> zone_pcp_enable 127 125 -2
> xhci_bus_resume 1011 1009 -2
> xfrm_input_init 230 228 -2
> xfeature_get_offset 137 135 -2
> x86_release_hardware 289 287 -2
> workqueue_online_cpu 756 754 -2
> workqueue_offline_cpu 550 548 -2
> weighted_interleave_nodes 311 309 -2
> vmalloc_init 1064 1062 -2
> vmalloc_info_show 1000 998 -2
> update_or_create_fnhe 902 900 -2
> update_group_capacity 556 554 -2
> tsc_init 882 880 -2
> try_to_generate_entropy 633 631 -2
> tracing_set_cpumask 284 282 -2
> tracing_release 336 334 -2
> tracing_entries_read 453 451 -2
> trace_rb_cpu_prepare 213 211 -2
> toggle_bp_slot.constprop 2625 2623 -2
> timekeeping_get_mg_floor_swaps 111 109 -2
> tcf_idr_create 639 637 -2
> task_non_contending 829 827 -2
> task_mm_cid_work 498 496 -2
> srcu_readers_active 128 126 -2
> srcu_barrier 515 513 -2
> softirq_init 150 148 -2
> snmp_seq_show_ipstats.constprop.isra 374 372 -2
> snmp6_seq_show_item64.constprop 264 262 -2
> snapshot_write_next 2486 2484 -2
> snapshot_read_next 626 624 -2
> smp_prepare_cpus_common 339 337 -2
> skx_pmu_get_topology 313 311 -2
> show_slab_objects 1071 1069 -2
> show_numa_map 980 978 -2
> show_interrupts 817 815 -2
> shmem_cppc_enable 225 223 -2
> setup_zone_pageset 327 325 -2
> setup_per_cpu_pageset 266 264 -2
> set_cpus_allowed_dl 276 274 -2
> set_cpu_sibling_map 1693 1691 -2
> set_buffer_entries 93 91 -2
> seq_hlist_next_percpu 202 200 -2
> send_pcc_cmd 656 654 -2
> scsi_show_rq 800 798 -2
> schedule_on_each_cpu 335 333 -2
> s_start 865 863 -2
> ring_buffer_subbuf_order_set 1229 1227 -2
> ring_buffer_overruns 107 105 -2
> ring_buffer_entries 124 122 -2
> recalc_bh_state.part 122 120 -2
> rcu_gp_cleanup 1556 1554 -2
> rcu_dump_cpu_stacks 370 368 -2
> rcu_check_boost_fail 467 465 -2
> rcec_assoc_rciep.isra 116 114 -2
> pt_init 981 979 -2
> process_srcu 1679 1677 -2
> phys_package_first_cpu 122 120 -2
> perf_output_sample_regs 181 179 -2
> perf_event_mux_interval_ms_store 365 363 -2
> percpu_is_read_locked 126 124 -2
> per_cpu_ptr_to_phys 266 264 -2
> part_stat_read_all 193 191 -2
> part_inflight_show 308 306 -2
> part_in_flight 133 131 -2
> padata_do_serial 225 223 -2
> padata_do_multithreaded 867 865 -2
> padata_alloc_pd 482 480 -2
> p4_pmu_enable_all 139 137 -2
> numa_nearest_node 210 208 -2
> nr_iowait 105 103 -2
> nr_context_switches 112 110 -2
> node_read_distance 234 232 -2
> netif_get_num_default_rss_queues 157 155 -2
> net_dev_init 795 793 -2
> native_smp_cpus_done 657 655 -2
> metadata_dst_alloc_percpu 370 368 -2
> memcpy_count_show 176 174 -2
> membarrier_global_expedited 330 328 -2
> mce_read_aux 394 392 -2
> loopback_get_stats64 145 143 -2
> kyber_timer_fn 596 594 -2
> kvm_flush_tlb_multi 149 147 -2
> kfree_rcu_shrink_count 157 155 -2
> kcore_update_ram.isra 783 781 -2
> iommu_dma_init_fq 500 498 -2
> iolatency_pd_init 495 493 -2
> interleave_nodes 163 161 -2
> interleave_nid 217 215 -2
> intel_pmu_drain_pebs_icl 866 864 -2
> intel_gt_init_workarounds 4160 4158 -2
> init_timers 173 171 -2
> init_sched_fair_class 213 211 -2
> init_cpu_to_node 284 282 -2
> inactive_task_timer 971 969 -2
> ieee80211_sta_last_active 152 150 -2
> ieee80211_add_rx_radiotap_header 2290 2288 -2
> idle_threads_init 181 179 -2
> icl_display_core_init 2340 2338 -2
> hw_breakpoint_is_used 207 205 -2
> get_nohz_timer_target 317 315 -2
> ftrace_dump_one 731 729 -2
> free_policy_dbs_info 124 122 -2
> free_iova_rcaches 285 283 -2
> free_area_init 3984 3982 -2
> fq_flush_timeout 234 232 -2
> flush_tlb_mm_range 427 425 -2
> ext4_update_super 942 940 -2
> ext4_mb_init 1965 1963 -2
> ext4_journal_commit_callback 470 468 -2
> ext4_fill_super 13081 13079 -2
> drv_change_sta_links 621 619 -2
> drop_slab 223 221 -2
> do_ipt_set_ctl 1559 1557 -2
> do_ip6t_set_ctl 1583 1581 -2
> dma_channel_table_init 279 277 -2
> dm_wait_for_completion 409 407 -2
> dl_clear_root_domain 176 174 -2
> dl_add_task_root_domain 337 335 -2
> dev_lstats_read 137 135 -2
> dev_fetch_sw_netstats 179 177 -2
> detect_cache_attributes 756 754 -2
> del_gendisk 849 847 -2
> default_hugepagesz_setup 454 452 -2
> cpuusage_write 199 197 -2
> cpuusage_user_read 120 118 -2
> cpuusage_sys_read 125 123 -2
> cpuusage_read 111 109 -2
> cpuidle_driver_state_disabled 234 232 -2
> cpufreq_show_cpus 172 170 -2
> cpufreq_notify_transition 281 279 -2
> cpufreq_driver_fast_switch 220 218 -2
> cpuacct_all_seq_show 292 290 -2
> cpu_stop_init 178 176 -2
> cpu_rmap_copy_neigh 140 138 -2
> cpu_init_debugfs 277 275 -2
> cppc_allow_fast_switch 133 131 -2
> cleanup_srcu_struct 424 422 -2
> cgroup_rstat_exit 191 189 -2
> cgroup_release 302 300 -2
> cgroup_exit 416 414 -2
> cgroup_can_fork 1277 1275 -2
> bytes_transferred_show 177 175 -2
> blkcg_reset_stats 481 479 -2
> blk_mq_update_queue_map 192 190 -2
> blk_mq_sysfs_init 158 156 -2
> blk_mq_hw_sysfs_cpus_show 289 287 -2
> arch_tlbbatch_flush 253 251 -2
> arch_enable_hybrid_capacity_scale 245 243 -2
> apply_wqattrs_commit 408 406 -2
> amd_uncore_ctx_init 516 514 -2
> amd_pmu_cpu_prepare 340 338 -2
> amd_pmu_check_overflow 173 171 -2
> amd_numa_init 892 890 -2
> alloc_cpu_rmap 200 198 -2
> all_vm_events 180 178 -2
> add_del_listener 565 563 -2
> acpi_processor_power_state_has_changed 418 416 -2
> acpi_map_cpuid 147 145 -2
> acpi_get_psd_map 367 365 -2
> acpi_cpufreq_probe 493 491 -2
> _ieee80211_set_active_links 1341 1339 -2
> __zone_set_pageset_high_and_batch 104 102 -2
> __sync_rcu_exp_select_node_cpus 954 952 -2
> __sched_clock_work 261 259 -2
> __percpu_counter_sum 136 134 -2
> __log_error 494 492 -2
> __do_sys_swapon 4497 4495 -2
> smp_call_function_many_cond 1320 1317 -3
> slabs_cpu_partial_show 326 323 -3
> show_free_areas 2826 2823 -3
> ring_buffer_reset_online_cpus 323 320 -3
> relay_open 667 664 -3
> register_netdevice 2041 2038 -3
> refresh_zone_stat_thresholds 372 369 -3
> perf_event_init 841 838 -3
> page_alloc_init_late 754 751 -3
> out_of_memory 1759 1756 -3
> netdev_rx_queue_set_rps_mask 292 289 -3
> mgts_show 328 325 -3
> ioc_timer_fn 4933 4930 -3
> init_mm_internals 689 686 -3
> ieee80211_vif_update_links 2506 2503 -3
> hugetlb_init 1565 1562 -3
> hugetlb_acct_memory.part 1112 1109 -3
> dm_stat_free 247 244 -3
> crypto_scomp_init_tfm 261 258 -3
> blk_mq_map_queues 204 201 -3
> blk_mq_hw_queue_to_node 123 120 -3
> amd_pmu_cpu_starting 379 376 -3
> workqueue_init 930 926 -4
> update_qos_request 250 246 -4
> tracing_open 972 968 -4
> snmp6_seq_show_item 369 365 -4
> shrink_dcache_sb 327 323 -4
> show_rcu_gp_kthreads 834 830 -4
> set_pgdat_percpu_threshold 182 178 -4
> select_fallback_rq 718 714 -4
> sched_dl_do_global 347 343 -4
> sbitmap_queue_show 405 401 -4
> ring_buffer_reset 230 226 -4
> rcu_tasks_kthread 191 187 -4
> perf_swevent_init 492 488 -4
> mce_end 651 647 -4
> intel_pmu_cpu_starting 1721 1717 -4
> intel_dp_compute_link_config 1331 1327 -4
> housekeeping_setup 617 613 -4
> ext4_mb_new_blocks 3703 3699 -4
> ext4_attr_show 1011 1007 -4
> elf_coredump_extra_notes_write 453 449 -4
> cpc_read_ffh 89 85 -4
> apply_wqattrs_cleanup.part 233 229 -4
> zone_pcp_reset 178 173 -5
> xt_free_table_info 134 129 -5
> wq_affn_dfl_set 253 248 -5
> workqueue_init_topology 271 266 -5
> try_check_zero 438 433 -5
> swapfile_init 220 215 -5
> start_kernel 1994 1989 -5
> sta_get_last_rx_stats 124 119 -5
> smpboot_register_percpu_thread 233 228 -5
> ring_buffer_free 145 140 -5
> release_callchain_buffers_rcu 111 106 -5
> probe_event_enable 872 867 -5
> pcpu_populate_chunk 1088 1083 -5
> padata_do_parallel 520 515 -5
> kvm_alloc_cpumask 177 172 -5
> kvfree_rcu_init 571 566 -5
> init_pod_type 586 581 -5
> gro_cells_init 257 252 -5
> gro_cells_destroy 342 337 -5
> free_fair_sched_group 162 157 -5
> dst_cache_destroy 141 136 -5
> cpuhp_smt_enable 243 238 -5
> amd_detect_prefcore 304 299 -5
> alloc_buffer 1352 1347 -5
> __list_lru_init 179 174 -5
> __fib6_drop_pcpu_from.part 209 204 -5
> __acpi_processor_set_throttling 1117 1112 -5
> trace_empty 233 227 -6
> tcp_v4_init 273 267 -6
> svc_seq_show 331 325 -6
> snmp_seq_show_tcp_udp.constprop.isra 942 936 -6
> seq_hlist_start_percpu 138 132 -6
> schedstat_next 131 125 -6
> ring_buffer_wake_waiters 191 185 -6
> perf_event_exit_cpu_context 593 587 -6
> percpu_down_write 400 394 -6
> pcpu_build_alloc_info 1315 1309 -6
> packet_read_pending.isra 105 99 -6
> nv_get_stats64 402 396 -6
> kvm_smp_send_call_func_ipi 100 94 -6
> irq_migrate_all_off_this_cpu 722 716 -6
> icmpv6_init 289 283 -6
> dl_bw_manage 785 779 -6
> cpufreq_dbs_governor_stop 142 136 -6
> blk_mq_map_swqueue 1057 1051 -6
> ahci_reset_controller 308 302 -6
> acpi_processor_throttling_init 788 782 -6
> __cpuacct_percpu_seq_show 163 157 -6
> wq_update_node_max_active 529 522 -7
> sysrq_timer_list_show 277 270 -7
> smpboot_destroy_threads 150 143 -7
> setup_cpu_entry_areas 932 925 -7
> regmap_field_init 135 128 -7
> mst_stream_compute_config 1659 1652 -7
> free_node_nr_active 165 158 -7
> drv_change_vif_links 635 628 -7
> do_ipt_get_ctl 1181 1174 -7
> cpu_down_maps_locked 203 196 -7
> core_guest_get_msrs 374 367 -7
> alloc_workqueue 1929 1922 -7
> __is_module_percpu_address 283 276 -7
> sta_set_sinfo 3023 3015 -8
> show_softirqs 334 326 -8
> populate_cache_leaves 1389 1381 -8
> is_mddev_idle 471 463 -8
> irq_matrix_reserve_managed 350 342 -8
> intel_psr_flush 985 977 -8
> get_callchain_buffers 414 406 -8
> find_next_best_node 276 268 -8
> core_pmu_enable_all 402 394 -8
> __percpu_counter_limited_add 435 427 -8
> __do_sys_swapoff 3799 3791 -8
> __dl_server_attach_root 238 230 -8
> smp_shutdown_nonboot_cpus 198 189 -9
> schedstat_start 125 116 -9
> reserve_ds_buffers 1597 1588 -9
> do_kmem_cache_create 1239 1230 -9
> dma_channel_rebalance 761 752 -9
> bioset_exit 381 372 -9
> __group_cpus_evenly 1264 1255 -9
> sched_balance_trigger 900 890 -10
> hugetlb_cgroup_free 127 117 -10
> flush_all_cpus_locked 349 339 -10
> dl_server_apply_params 976 966 -10
> compaction_proactiveness_sysctl_handler 301 291 -10
> __build_all_zonelists 229 219 -10
> numa_set_distance 578 567 -11
> do_ip6t_get_ctl 1206 1195 -11
> del_from_avail_list 220 209 -11
> cpu_rmap_update 623 612 -11
> x86_pmu_disable_all 422 410 -12
> weighted_interleave_nid 385 373 -12
> rcu_sched_clock_irq 4324 4312 -12
> icmp_init 286 274 -12
> hugetlb_cgroup_read_numa_stat 607 595 -12
> check_hw_exists 1060 1048 -12
> cgroup_migrate_execute 1136 1124 -12
> acpi_processor_preregister_performance 1174 1162 -12
> __reserve_bp_slot 593 581 -12
> sysctl_compaction_handler 196 183 -13
> sched_dl_overflow 1308 1295 -13
> release_ds_buffers 310 297 -13
> mempolicy_sysfs_init 664 651 -13
> intel_drrs_activate 392 379 -13
> sched_init_numa 1874 1860 -14
> dev_get_stats 816 802 -14
> perf_assign_events 927 912 -15
> dl_task_timer 1540 1524 -16
> __pfx_lpit_read_residency_counter_us.part 16 - -16
> __pfx_intel_pstate_update_policies 16 - -16
> numa_init 739 722 -17
> dm_stats_message 4430 4410 -20
> fpu__init_system_xstate 3798 3774 -24
> low_power_idle_system_residency_us_show 130 105 -25
> ring_buffer_resize 1319 1292 -27
> cppc_perf_ctrs_in_pcc 309 276 -33
> load_module 9691 9631 -60
> intel_pstate_update_policies 90 - -90
> lpit_read_residency_counter_us.part 191 - -191
> Total: Before=22453915, After=22452913, chg -0.00%
>
> * Code size shrinking ( gcc-11 for x86_64 NR_CPUS=64 ):
>
> $ ./scripts/bloat-o-meter vmlinux_old vmlinux_new
> add/remove: 0/2 grow/shrink: 36/518 up/down: 564/-1771 (-1207)
> Function old new delta
> metadata_dst_free_percpu 165 276 +111
> store_min_perf_pct 267 371 +104
> store_max_perf_pct 245 345 +100
> store_hwp_dynamic_boost 130 223 +93
> intel_psr_invalidate 645 662 +17
> hybrid_update_cpu_capacity_scaling 291 307 +16
> proc_nr_dentry 387 402 +15
> __alloc_frozen_pages_noprof 4069 4084 +15
> show_slab_objects 1067 1081 +14
> pcpu_build_alloc_info 1336 1348 +12
> tracing_total_entries_read 364 371 +7
> sbitmap_queue_show 406 412 +6
> ieee80211_subif_start_xmit 1124 1129 +5
> ieee80211_rx_mgmt_beacon 6008 6013 +5
> __i915_gem_object_set_pages 567 572 +5
> rcu_init 2429 2433 +4
> tracing_set_cpumask 284 287 +3
> numa_policy_init 569 572 +3
> can_migrate_task 537 540 +3
> amd_uncore_ctx_move 323 326 +3
> unregister_fair_sched_group 546 548 +2
> tsc_store_and_check_tsc_adjust 503 505 +2
> sched_dl_overflow 1309 1311 +2
> part_stat_read_all 254 256 +2
> intel_engines_init_mmio 3368 3370 +2
> gnet_stats_add_queue 212 214 +2
> cpc_write_ffh 157 159 +2
> workqueue_init 881 882 +1
> snmp6_seq_show_item64.constprop 261 262 +1
> seq_hlist_next_percpu 196 197 +1
> reclaim_throttle 763 764 +1
> hswep_uncore_sbox_msr_init_box 192 193 +1
> dev_change_proto_down_reason 153 154 +1
> cleanup_srcu_struct 409 410 +1
> alloc_fd 411 412 +1
> __snmp6_fill_stats64.constprop 304 305 +1
> zoneinfo_show 853 852 -1
> zone_watermark_ok_safe 175 174 -1
> zone_pcp_reset 181 180 -1
> zhaoxin_arch_events_quirk 139 138 -1
> xt_init 317 316 -1
> x86_pmu_enable_all 380 379 -1
> wq_affn_dfl_set 266 265 -1
> wake_up_all_idle_cpus 144 143 -1
> uprobe_buffer_disable 167 166 -1
> uncore_event_cpu_offline 395 394 -1
> tsc_refine_calibration_work 886 885 -1
> try_to_unmap_one 2424 2423 -1
> try_to_migrate_one 2138 2137 -1
> try_check_zero 399 398 -1
> tracing_entries_read 461 460 -1
> trace_empty 233 232 -1
> tmigr_cpu_offline 398 397 -1
> timer_list_start 180 179 -1
> timekeeping_get_mg_floor_swaps 106 105 -1
> tick_handle_oneshot_broadcast 401 400 -1
> tick_clock_notify 109 108 -1
> tick_broadcast_setup_oneshot 304 303 -1
> thaw_secondary_cpus 421 420 -1
> tcp_sigpool_alloc_ahash 954 953 -1
> tc_fill_qdisc 1103 1102 -1
> sysctl_vm_numa_stat_handler 448 447 -1
> sysctl_compaction_handler 201 200 -1
> sw_perf_event_destroy 135 134 -1
> sugov_stop 143 142 -1
> store_no_turbo 652 651 -1
> sta_get_last_rx_stats 122 121 -1
> srcu_torture_stats_print 542 541 -1
> sock_inuse_get 106 105 -1
> snmp_fold_field 108 107 -1
> smpboot_destroy_threads 143 142 -1
> smp_call_function_any 265 264 -1
> show_stat 2330 2329 -1
> show_rcu_tasks_generic_gp_kthread 447 446 -1
> setup_swap_info 234 233 -1
> sched_update_numa 426 425 -1
> sched_balance_rq 3651 3650 -1
> rto_next_cpu 144 143 -1
> ring_buffer_overruns 102 101 -1
> ring_buffer_free 148 147 -1
> ring_buffer_entries 119 118 -1
> reserve_lbr_buffers 209 208 -1
> release_callchain_buffers_rcu 109 108 -1
> relay_close 367 366 -1
> reclaim_and_purge_vmap_areas 452 451 -1
> rebind_subsystems 1310 1309 -1
> rdmacg_resource_set_max 867 866 -1
> rcu_tasks_kthread 202 201 -1
> rcu_spawn_gp_kthread 644 643 -1
> rcu_spawn_exp_par_gp_kworker 382 381 -1
> rcu_report_exp_cpu_mult 176 175 -1
> rcu_gp_cleanup 1551 1550 -1
> rcu_barrier_tasks_generic 465 464 -1
> pull_dl_task 795 794 -1
> pti_init 537 536 -1
> pt_init 1015 1014 -1
> process_srcu 1537 1536 -1
> pfifo_fast_reset 338 337 -1
> perf_trace_event_init 753 752 -1
> perf_reboot 108 107 -1
> perf_event_exit_cpu_context 577 576 -1
> percpu_counter_set 140 139 -1
> pcpu_setup_first_chunk 1991 1990 -1
> pcpu_free_pages.constprop 176 175 -1
> pcpu_depopulate_chunk 412 411 -1
> part_inflight_show 323 322 -1
> packet_read_pending.isra 111 110 -1
> p4_pmu_enable_all 136 135 -1
> od_set_powersave_bias 216 215 -1
> nr_processes 106 105 -1
> nr_context_switches 107 106 -1
> node_dev_init 191 190 -1
> nh_fill_node 2443 2442 -1
> nfs_show_stats 1187 1186 -1
> netdev_refcnt_read 106 105 -1
> neightbl_fill_info.constprop 1091 1090 -1
> native_stop_other_cpus 429 428 -1
> mnt_get_writers 100 99 -1
> mnt_get_count 103 102 -1
> mm_init.constprop 878 877 -1
> metadata_dst_alloc_percpu 374 373 -1
> memory_tier_late_init 1929 1928 -1
> membarrier_private_expedited 640 639 -1
> mem_init 533 532 -1
> kvm_alloc_cpumask 188 187 -1
> kswapd_init 112 111 -1
> kstat_irqs_desc 123 122 -1
> knc_pmu_handle_irq 650 649 -1
> kmem_cache_init 384 383 -1
> kcompactd_init 244 243 -1
> ipv6_add_dev 1375 1374 -1
> ipv4_mib_init_net 523 522 -1
> ip_rt_init 605 604 -1
> ip6_route_init 571 570 -1
> intel_pmu_handle_irq 1508 1507 -1
> intel_gt_mcr_init 909 908 -1
> intel_arch_events_quirk 139 138 -1
> input_leds_connect 736 735 -1
> init_sched_rt_class 101 100 -1
> init_sched_dl_class 101 100 -1
> init_gi_nodes 137 136 -1
> init_cpu_to_node 284 283 -1
> inet6_net_init 661 660 -1
> icl_display_core_init 2329 2328 -1
> i915_pmu_cpu_offline 268 267 -1
> hybrid_set_capacity_of_cpus 139 138 -1
> hugetlb_cgroup_free 120 119 -1
> housekeeping_init 126 125 -1
> group_cpus_evenly 431 430 -1
> gov_update_cpu_data 263 262 -1
> free_iova_rcaches 266 265 -1
> free_fair_sched_group 164 163 -1
> free_acpi_perf_data 80 79 -1
> fpu__init_system_xstate 3089 3088 -1
> fold_vm_zone_numa_events 218 217 -1
> flush_all_cpus_locked 320 319 -1
> flow_limit_cpu_sysctl 519 518 -1
> filelock_init 377 376 -1
> ext4_mb_new_blocks 3688 3687 -1
> do_migrate_pages 826 825 -1
> do_ipt_set_ctl 1501 1500 -1
> do_ip6t_set_ctl 1525 1524 -1
> dm_stats_init 195 194 -1
> dl_cpuset_cpumask_can_shrink 274 273 -1
> dl_clear_root_domain 175 174 -1
> dl_bw_cpus 135 134 -1
> disable_freq_invariance_workfn 118 117 -1
> dev_fetch_sw_netstats 177 176 -1
> default_send_IPI_mask_allbutself_phys 267 266 -1
> crash_prepare_elf64_headers 584 583 -1
> cpupri_init 182 181 -1
> cpupri_find_fitness 298 297 -1
> cpuhp_sysfs_init 273 272 -1
> cpuhp_smt_enable 252 251 -1
> cpuhp_smt_disable 225 224 -1
> cpufreq_set_policy 802 801 -1
> cpufreq_policy_free 403 402 -1
> cpufreq_driver_fast_switch 243 242 -1
> cpufreq_dbs_governor_start 449 448 -1
> cpufreq_dbs_governor_init 689 688 -1
> cpudl_init 159 158 -1
> cpudl_find 349 348 -1
> cpu_map_shared_cache.part 284 283 -1
> cpu_down_maps_locked 200 199 -1
> cpu_dev_init 230 229 -1
> cppc_allow_fast_switch 135 134 -1
> core_guest_get_msrs 369 368 -1
> clocksource_verify_percpu.part 1015 1014 -1
> cgroup_subtree_control_write 1023 1022 -1
> cgroup_rstat_init 170 169 -1
> cgroup_rstat_exit 177 176 -1
> cgroup_rstat_boot 105 104 -1
> cgroup_release 319 318 -1
> cgroup_exit 429 428 -1
> cgroup_base_stat_cputime_show 792 791 -1
> call_function_init 115 114 -1
> build_all_zonelists_init 280 279 -1
> bpf_prog_alloc 175 174 -1
> blkg_alloc 446 445 -1
> blkcg_reset_stats 491 490 -1
> blkcg_css_alloc 569 568 -1
> blk_stat_add_callback 251 250 -1
> blk_mq_sysfs_deinit 123 122 -1
> blk_mq_init_allocated_queue 1010 1009 -1
> bioset_exit 396 395 -1
> begin_new_exec 2881 2880 -1
> apply_wqattrs_commit 417 416 -1
> amd_uncore_umc_ctx_init 853 852 -1
> amd_pstate_change_mode_without_dvr_change 133 132 -1
> alloc_desc 503 502 -1
> alloc_buffer 1380 1379 -1
> ahci_save_initial_config 1139 1138 -1
> ahci_reset_controller 338 337 -1
> add_to_avail_list 320 319 -1
> acpi_cpc_valid 132 131 -1
> _vm_unmap_aliases 615 614 -1
> __sched_clock_work 271 270 -1
> __purge_vmap_area_lazy 869 868 -1
> __percpu_ref_switch_mode 500 499 -1
> __percpu_counter_sum 139 138 -1
> __ftrace_clear_event_pids 563 562 -1
> __drain_swap_slots_cache 92 91 -1
> __dm_stat_init_temporary_percpu_totals 442 441 -1
> xhci_bus_resume 1011 1009 -2
> xfrm_input_init 232 230 -2
> xfeature_get_offset 144 142 -2
> x86_release_hardware 312 310 -2
> weighted_interleave_nid 458 456 -2
> vmalloc_init 1017 1015 -2
> vmalloc_info_show 1003 1001 -2
> update_per_cpu_data_slice_size 222 220 -2
> update_group_capacity 546 544 -2
> uncore_pmu_hrtimer 264 262 -2
> uncore_device_to_die 158 156 -2
> tsc_restore_sched_clock_state 229 227 -2
> tsc_init 862 860 -2
> try_to_generate_entropy 592 590 -2
> trace_rb_cpu_prepare 219 217 -2
> trace_buffered_event_enable 353 351 -2
> tcp_orphan_count_sum 109 107 -2
> tcf_idr_create 671 669 -2
> task_mm_cid_work 510 508 -2
> svc_seq_show 332 330 -2
> svc_create_pooled 815 813 -2
> start_kernel 1989 1987 -2
> srcu_readers_active 130 128 -2
> speculative_store_bypass_ht_init 202 200 -2
> softirq_init 152 150 -2
> sock_prot_inuse_get 124 122 -2
> snmp_seq_show_ipstats.constprop.isra 382 380 -2
> snmp6_seq_show_item.part 268 266 -2
> snapshot_read_next 628 626 -2
> smp_call_function_many_cond 1282 1280 -2
> show_numa_map 979 977 -2
> setup_zone_pageset 328 326 -2
> setup_per_cpu_pageset 269 267 -2
> set_pgdat_percpu_threshold 185 183 -2
> set_buffer_entries 96 94 -2
> seq_hlist_start_percpu 135 133 -2
> send_pcc_cmd 655 653 -2
> scsi_show_rq 793 791 -2
> schedule_on_each_cpu 318 316 -2
> sbitmap_init_node 506 504 -2
> rtm_new_nexthop 5429 5427 -2
> ring_buffer_subbuf_order_set 1162 1160 -2
> relay_open 704 702 -2
> recalc_bh_state.part 123 121 -2
> rcu_barrier 875 873 -2
> rcec_assoc_rciep.isra 116 114 -2
> proc_nr_inodes 177 175 -2
> probe_event_enable 874 872 -2
> perf_event_print_debug 1273 1271 -2
> percpu_ref_switch_to_atomic_rcu 380 378 -2
> percpu_is_read_locked 136 134 -2
> percpu_down_write 405 403 -2
> per_cpu_ptr_to_phys 267 265 -2
> pcpu_alloc_noprof 1904 1902 -2
> partition_sched_domains_locked 1068 1066 -2
> part_in_flight 135 133 -2
> page_alloc_init_late 771 769 -2
> padata_do_serial 225 223 -2
> padata_do_parallel 534 532 -2
> padata_do_multithreaded 856 854 -2
> padata_alloc_pd 521 519 -2
> out_of_memory 1699 1697 -2
> nv_get_stats64 404 402 -2
> numa_nearest_node 210 208 -2
> nr_running 103 101 -2
> nr_iowait 110 108 -2
> node_read_distance 236 234 -2
> netif_get_num_default_rss_queues 170 168 -2
> net_dev_init 808 806 -2
> native_smp_cpus_done 667 665 -2
> mq_dump_class_stats 239 237 -2
> memcpy_count_show 174 172 -2
> membarrier_global_expedited 322 320 -2
> mce_read_aux 394 392 -2
> kyber_timer_fn 583 581 -2
> kvm_flush_tlb_multi 151 149 -2
> kvfree_rcu_barrier 341 339 -2
> kcore_update_ram.isra 781 779 -2
> irq_migrate_all_off_this_cpu 797 795 -2
> irq_matrix_alloc_managed 370 368 -2
> irq_matrix_alloc 334 332 -2
> irq_alloc_matrix 259 257 -2
> interleave_nodes 188 186 -2
> interleave_nid 209 207 -2
> input_register_device 1248 1246 -2
> init_timers 179 177 -2
> init_sched_fair_class 215 213 -2
> inactive_task_timer 975 973 -2
> ieee80211_add_rx_radiotap_header 2252 2250 -2
> idle_threads_init 177 175 -2
> hw_breakpoint_is_used 206 204 -2
> hpet_open 500 498 -2
> gnet_stats_add_basic 183 181 -2
> get_total_entries 196 194 -2
> get_nr_inodes 108 106 -2
> get_nr_dirty_inodes 141 139 -2
> get_nohz_timer_target 315 313 -2
> gen11_gt_irq_handler 867 865 -2
> ftrace_dump_one 771 769 -2
> free_policy_dbs_info 126 124 -2
> free_area_init 3826 3824 -2
> force_qs_rnp 764 762 -2
> flush_tlb_mm_range 400 398 -2
> ext4_update_super 997 995 -2
> ext4_mb_init 1958 1956 -2
> ext4_fill_super 13483 13481 -2
> elf_coredump_extra_notes_size 107 105 -2
> drv_change_vif_links 639 637 -2
> drv_change_sta_links 606 604 -2
> drop_slab 209 207 -2
> dma_channel_table_init 286 284 -2
> dm_wait_for_completion 399 397 -2
> dev_lstats_read 137 135 -2
> detect_cache_attributes 729 727 -2
> del_gendisk 822 820 -2
> default_hugepagesz_setup 456 454 -2
> cpuusage_write 198 196 -2
> cpumask_next_wrap 110 108 -2
> cpuidle_driver_state_disabled 238 236 -2
> cpufreq_online 2582 2580 -2
> cpu_stop_init 184 182 -2
> cpu_rmap_copy_neigh 151 149 -2
> cpu_init_debugfs 251 249 -2
> core_pmu_enable_all 399 397 -2
> compaction_zonelist_suitable 392 390 -2
> clock_was_set 551 549 -2
> cgroup_post_fork 662 660 -2
> cgroup_can_fork 1397 1395 -2
> cfg80211_any_usable_channels 166 164 -2
> calibrate_delay_is_known 250 248 -2
> cache_shared_cpu_map_remove 313 311 -2
> bytes_transferred_show 175 173 -2
> blk_stat_timer_fn 369 367 -2
> blk_mq_update_queue_map 204 202 -2
> blk_mq_map_hw_queues 188 186 -2
> blk_mq_init 364 362 -2
> blk_mq_hw_queue_to_node 131 129 -2
> blk_mq_delay_run_hw_queue 411 409 -2
> arch_tlbbatch_flush 246 244 -2
> arch_enable_hybrid_capacity_scale 252 250 -2
> apply_wqattrs_prepare 586 584 -2
> amd_uncore_ctx_init.part 524 522 -2
> amd_put_event_constraints 151 149 -2
> amd_pmu_cpu_starting 382 380 -2
> amd_pmu_cpu_prepare 353 351 -2
> amd_pmu_check_overflow 171 169 -2
> amd_numa_init 891 889 -2
> amd_detect_prefcore 341 339 -2
> alloc_pages_bulk_mempolicy_noprof 1553 1551 -2
> alloc_iova_fast 666 664 -2
> alloc_cpu_rmap 206 204 -2
> all_vm_events 193 191 -2
> addrconf_disable_policy_idev 337 335 -2
> add_del_listener 583 581 -2
> acpi_get_psd_map 352 350 -2
> acpi_cpufreq_probe 486 484 -2
> __zone_set_pageset_high_and_batch 104 102 -2
> __sync_rcu_exp_select_node_cpus 961 959 -2
> __percpu_counter_limited_add 483 481 -2
> __log_error 476 474 -2
> __is_module_percpu_address 281 279 -2
> __is_kernel_percpu_address 184 182 -2
> __do_sys_swapon 4491 4489 -2
> __do_sys_swapoff 3463 3461 -2
> __dl_server_attach_root 239 237 -2
> ___gnet_stats_copy_basic.isra 399 397 -2
> x86_reserve_hardware 668 665 -3
> update_or_create_fnhe 921 918 -3
> smp_prepare_cpus_common 314 311 -3
> select_task_rq_fair 4362 4359 -3
> reserve_ds_buffers 1607 1604 -3
> register_netdevice 2057 2054 -3
> refresh_zone_stat_thresholds 399 396 -3
> rcu_tasks_trace_pregp_step 1171 1168 -3
> pcpu_populate_chunk 1058 1055 -3
> numa_init 697 694 -3
> mgts_show 347 344 -3
> irq_matrix_reserve_managed 362 359 -3
> ioc_timer_fn 4929 4926 -3
> intel_dp_compute_link_config 1224 1221 -3
> init_mm_internals 716 713 -3
> ieee80211_vif_update_links 2023 2020 -3
> hugetlb_init 1468 1465 -3
> dst_cache_destroy 150 147 -3
> dl_server_apply_params 963 960 -3
> cpufreq_show_cpus 175 172 -3
> cpu_rmap_update 507 504 -3
> cppc_perf_ctrs_in_pcc 315 312 -3
> blk_mq_map_queues 206 203 -3
> workqueue_offline_cpu 531 527 -4
> workqueue_init_topology 282 278 -4
> update_qos_request 249 245 -4
> unregister_netdevice_many_notify 2229 2225 -4
> tracing_release 342 338 -4
> toggle_bp_slot.constprop 2658 2654 -4
> sync_runqueues_membarrier_state.part 270 266 -4
> smpboot_register_percpu_thread 274 270 -4
> shrink_dcache_sb 344 340 -4
> show_rcu_gp_kthreads 823 819 -4
> show_free_areas 2755 2751 -4
> set_cpus_allowed_dl 278 274 -4
> set_cpu_sibling_map 1600 1596 -4
> select_fallback_rq 627 623 -4
> s_start 857 853 -4
> release_ds_buffers 305 301 -4
> qdisc_alloc 521 517 -4
> probes_profile_seq_show 369 365 -4
> phys_package_first_cpu 126 122 -4
> perf_swevent_init 575 571 -4
> netstat_seq_show 768 764 -4
> kvm_smp_send_call_func_ipi 102 98 -4
> intel_pmu_cpu_starting 1713 1709 -4
> hw_breakpoint_arch_parse 659 655 -4
> hugetlb_acct_memory.part 1113 1109 -4
> fq_flush_timeout 236 232 -4
> ext4_attr_show 991 987 -4
> elf_coredump_extra_notes_write 435 431 -4
> dst_cache_reset_now 163 159 -4
> cpc_read_ffh 89 85 -4
> alloc_workqueue 1971 1967 -4
> _ieee80211_set_active_links 1298 1294 -4
> __drain_all_pages 429 425 -4
> xt_free_table_info 136 131 -5
> tcp_v4_init 261 256 -5
> swapfile_init 224 219 -5
> srcu_barrier 519 514 -5
> slabs_cpu_partial_show 348 343 -5
> show_interrupts 871 866 -5
> ring_buffer_reset_online_cpus 338 333 -5
> relay_reset 195 190 -5
> relay_flush 195 190 -5
> rcu_check_boost_fail 459 454 -5
> perf_event_mux_interval_ms_store 352 347 -5
> mce_end 666 661 -5
> kvfree_rcu_init 579 574 -5
> iommu_dma_init_fq 494 489 -5
> intel_pstate_driver_cleanup 223 218 -5
> icmpv6_init 285 280 -5
> housekeeping_setup 645 640 -5
> gro_cells_destroy 342 337 -5
> get_callchain_buffers 430 425 -5
> dm_stats_message 4299 4294 -5
> dm_stat_free 290 285 -5
> dl_add_task_root_domain 334 329 -5
> cpufreq_dbs_governor_stop 144 139 -5
> cpuacct_stats_show 374 369 -5
> cgroup_propagate_control 342 337 -5
> cgroup_print_ss_mask 186 181 -5
> blkcg_print_stat 816 811 -5
> blk_mq_sysfs_init 160 155 -5
> apply_wqattrs_cleanup.part 232 227 -5
> amd_pmu_enable_all 140 135 -5
> __list_lru_init 179 174 -5
> __group_cpus_evenly 1298 1293 -5
> __blkg_release 276 271 -5
> weighted_interleave_nodes 326 320 -6
> snmp_seq_show_tcp_udp.constprop.isra 1005 999 -6
> setup_cpu_entry_areas 1159 1153 -6
> schedstat_next 131 125 -6
> sched_dl_do_global 349 343 -6
> sched_balance_trigger 943 937 -6
> ring_buffer_wake_waiters 191 185 -6
> ring_buffer_reset 238 232 -6
> rcu_sched_clock_irq 4063 4057 -6
> print_ICs 302 296 -6
> perf_output_sample_regs 172 166 -6
> netdev_rx_queue_set_rps_mask 313 307 -6
> kfree_rcu_shrink_count 172 166 -6
> iova_domain_init_rcaches 454 448 -6
> iolatency_pd_init 519 513 -6
> init_pod_type 546 540 -6
> gro_cells_init 260 254 -6
> crypto_scomp_init_tfm 261 255 -6
> cpuacct_all_seq_show 294 288 -6
> cgroup_migrate_execute 1179 1173 -6
> allow_direct_reclaim.part 308 302 -6
> __cpuusage_read 127 121 -6
> __cpuacct_percpu_seq_show 165 159 -6
> wq_update_node_max_active 536 529 -7
> sysrq_timer_list_show 285 278 -7
> sta_set_sinfo 3039 3032 -7
> regmap_field_init 129 122 -7
> populate_cache_leaves 1347 1340 -7
> mst_stream_compute_config 1599 1592 -7
> lpit_read_residency_counter_us 309 302 -7
> is_mddev_idle 525 518 -7
> free_node_nr_active 167 160 -7
> check_hw_exists 1041 1034 -7
> blk_mq_map_swqueue 1090 1083 -7
> acpi_processor_throttling_init 775 768 -7
> zone_reclaimable_pages 808 800 -8
> ring_buffer_empty 280 272 -8
> perf_assign_events 838 830 -8
> intel_pmu_init 14230 14222 -8
> dma_channel_rebalance 752 744 -8
> cpufreq_notify_transition 302 294 -8
> __reserve_bp_slot 599 591 -8
> snapshot_write_next 2467 2458 -9
> smp_shutdown_nonboot_cpus 213 204 -9
> skx_pmu_get_topology 338 329 -9
> schedstat_start 125 116 -9
> intel_psr_flush 976 967 -9
> icmp_init 276 267 -9
> find_next_best_node 291 282 -9
> tracing_open 986 976 -10
> remove_siblinginfo 807 797 -10
> dl_task_timer 1557 1547 -10
> compaction_proactiveness_sysctl_handler 299 289 -10
> show_softirqs 362 351 -11
> hugetlb_cgroup_read_numa_stat 634 623 -11
> dev_get_stats 818 807 -11
> del_from_avail_list 241 230 -11
> acpi_processor_power_state_has_changed 447 436 -11
> acpi_map_cpuid 157 146 -11
> numa_set_distance 601 589 -12
> intel_drrs_activate 376 364 -12
> task_non_contending 840 827 -13
> dl_bw_manage 837 823 -14
> intel_get_event_constraints 870 855 -15
> do_kmem_cache_create 1245 1230 -15
> acpi_processor_preregister_performance 1131 1116 -15
> __build_all_zonelists 241 226 -15
> ring_buffer_resize 1325 1309 -16
> __pfx_intel_pstate_update_policies 16 - -16
> sched_init_numa 1951 1932 -19
> intel_gt_init_workarounds 4277 4257 -20
> workqueue_online_cpu 746 724 -22
> blk_iocost_init 650 628 -22
> __acpi_processor_set_throttling 1056 1031 -25
> build_sched_domains 5361 5335 -26
> amd_pmu_v2_handle_irq 1018 989 -29
> load_module 8010 7973 -37
> intel_pstate_update_policies 96 - -96
> Total: Before=22302033, After=22300826, chg -0.01%
>
> * Code size shrinking ( gcc-13 for x86_64 with NR_CPUS=1024 ):
>
> $ ./scripts/bloat-o-meter vmlinux_old vmlinux_new
> add/remove: 0/0 grow/shrink: 9/132 up/down: 51/-503 (-452)
> Function old new delta
> cpuset_mem_spread_node 283 297 +14
> perf_assign_events 901 914 +13
> numa_policy_init 602 609 +7
> hidinput_connect 20926 20930 +4
> dev_change_proto_down_reason 164 168 +4
> cgroup_propagate_control 403 407 +4
> ext4_fill_super 12742 12745 +3
> alloc_fd 376 377 +1
> alloc_buffer 1357 1358 +1
> zhaoxin_pmu_handle_irq 772 771 -1
> zhaoxin_arch_events_quirk 137 136 -1
> wq_update_node_max_active 618 617 -1
> uncore_pmu_hrtimer 261 260 -1
> svc_create_pooled 772 771 -1
> show_free_areas 2802 2801 -1
> setup_swap_info 235 234 -1
> sched_update_numa 433 432 -1
> rdmacg_resource_set_max 892 891 -1
> rcu_report_exp_cpu_mult 175 174 -1
> perf_event_print_debug 1227 1226 -1
> p4_pmu_handle_irq 631 630 -1
> node_dev_init 189 188 -1
> memory_tier_late_init 1762 1761 -1
> mem_init 520 519 -1
> kswapd_init 110 109 -1
> kmem_cache_init 369 368 -1
> kcompactd_init 242 241 -1
> intel_gt_mcr_init 886 885 -1
> intel_get_event_constraints 846 845 -1
> intel_arch_events_quirk 137 136 -1
> input_leds_connect 720 719 -1
> init_mm_internals 654 653 -1
> init_gi_nodes 132 131 -1
> housekeeping_init 153 152 -1
> gen11_gt_irq_handler 924 923 -1
> fpu__init_system_xstate 3179 3178 -1
> elf_coredump_extra_notes_size 107 106 -1
> ehci_hrtimer_func 233 232 -1
> do_migrate_pages 807 806 -1
> cpc_write_ffh 167 166 -1
> cgroup_subtree_control_write 1008 1007 -1
> cgroup_post_fork 634 633 -1
> amd_pmu_v2_handle_irq 1053 1052 -1
> add_to_avail_list 310 309 -1
> __i915_gem_object_set_pages 547 546 -1
> __do_sys_swapon 4230 4229 -1
> __copy_xstate_to_uabi_buf 2416 2415 -1
> xhci_bus_resume 1011 1009 -2
> xfeature_get_offset 137 135 -2
> x86_release_hardware 322 320 -2
> weighted_interleave_nodes 331 329 -2
> vmalloc_info_show 1000 998 -2
> snapshot_write_next 2486 2484 -2
> snapshot_read_next 626 624 -2
> show_numa_map 980 978 -2
> scsi_show_rq 800 798 -2
> rcu_gp_cleanup 1556 1554 -2
> rcec_assoc_rciep.isra 116 114 -2
> perf_output_sample_regs 181 179 -2
> padata_do_multithreaded 877 875 -2
> p4_pmu_enable_all 132 130 -2
> numa_nearest_node 210 208 -2
> node_read_distance 234 232 -2
> mce_read_aux 394 392 -2
> kcore_update_ram.isra 783 781 -2
> interleave_nodes 166 164 -2
> interleave_nid 217 215 -2
> intel_pmu_init 14167 14165 -2
> intel_pmu_drain_pebs_icl 866 864 -2
> intel_gt_init_workarounds 4139 4137 -2
> input_register_device 1348 1346 -2
> ieee80211_rx_mgmt_beacon 5755 5753 -2
> ieee80211_add_rx_radiotap_header 2267 2265 -2
> icl_display_core_init 2347 2345 -2
> free_area_init 4062 4060 -2
> drv_change_sta_links 621 619 -2
> drop_slab 223 221 -2
> dma_channel_table_init 279 277 -2
> default_hugepagesz_setup 454 452 -2
> core_pmu_enable_all 399 397 -2
> cgroup_release 302 300 -2
> cgroup_exit 416 414 -2
> cgroup_can_fork 1282 1280 -2
> amd_pmu_enable_all 132 130 -2
> amd_pmu_cpu_prepare 340 338 -2
> amd_pmu_check_overflow 177 175 -2
> amd_numa_init 901 899 -2
> alloc_workqueue 1964 1962 -2
> alloc_pages_bulk_mempolicy_noprof 1530 1528 -2
> ahci_reset_controller 301 299 -2
> _ieee80211_set_active_links 1341 1339 -2
> __sync_rcu_exp_select_node_cpus 954 952 -2
> __log_error 494 492 -2
> rebind_subsystems 1264 1261 -3
> page_alloc_init_late 754 751 -3
> out_of_memory 1780 1777 -3
> ieee80211_subif_start_xmit 1121 1118 -3
> hugetlb_init 1608 1605 -3
> hugetlb_acct_memory.part 1112 1109 -3
> housekeeping_setup 764 761 -3
> __group_cpus_evenly 1372 1369 -3
> shrink_dcache_sb 327 323 -4
> intel_psr_invalidate 667 663 -4
> intel_dp_compute_link_config 1317 1313 -4
> ieee80211_vif_update_links 2562 2558 -4
> hpet_open 491 487 -4
> elf_coredump_extra_notes_write 453 449 -4
> cpc_read_ffh 89 85 -4
> x86_pmu_enable_all 377 372 -5
> swapfile_init 220 215 -5
> cgroup_print_ss_mask 182 177 -5
> __list_lru_init 179 174 -5
> x86_pmu_disable_all 411 405 -6
> intel_engines_init_mmio 3432 3426 -6
> regmap_field_init 122 115 -7
> mst_stream_compute_config 1659 1652 -7
> lpit_read_residency_counter_us 309 302 -7
> free_node_nr_active 165 158 -7
> intel_psr_flush 982 974 -8
> drv_change_vif_links 635 627 -8
> do_kmem_cache_create 1217 1209 -8
> core_guest_get_msrs 347 339 -8
> check_hw_exists 1074 1066 -8
> __do_sys_swapoff 3766 3758 -8
> x86_reserve_hardware 680 671 -9
> hugetlb_cgroup_free 127 117 -10
> compaction_proactiveness_sysctl_handler 298 288 -10
> ahci_save_initial_config 1170 1160 -10
> __build_all_zonelists 229 219 -10
> numa_set_distance 578 567 -11
> del_from_avail_list 220 209 -11
> weighted_interleave_nid 385 373 -12
> hugetlb_cgroup_read_numa_stat 607 595 -12
> sysctl_compaction_handler 196 183 -13
> mempolicy_sysfs_init 664 651 -13
> intel_drrs_activate 392 379 -13
> find_next_best_node 313 300 -13
> cgroup_migrate_execute 1151 1138 -13
> sched_init_numa 1926 1910 -16
> numa_init 729 712 -17
> rtm_new_nexthop 5805 5785 -20
> Total: Before=22493682, After=22493230, chg -0.00%
>
> * Code size shrinking ( gcc-12 for x86_64 with NR_CPUS=1024 ):
>
> $ ./scripts/bloat-o-meter vmlinux_old vmlinux_new
> add/remove: 2/2 grow/shrink: 17/124 up/down: 396/-721 (-325)
> Function old new delta
> lpit_read_residency_counter_us - 302 +302
> alloc_pages_bulk_mempolicy_noprof 1556 1589 +33
> __pfx_lpit_read_residency_counter_us - 16 +16
> numa_policy_init 602 609 +7
> rebind_subsystems 1261 1266 +5
> blk_mq_flush_busy_ctxs 463 468 +5
> __i915_gem_object_set_pages 545 550 +5
> dev_change_proto_down_reason 164 168 +4
> x86_reserve_hardware 648 651 +3
> netstat_seq_show 662 665 +3
> cpuset_mem_spread_node 297 300 +3
> low_power_idle_cpu_residency_us_show 100 102 +2
> cgroup_propagate_control 405 407 +2
> intel_engines_init_mmio 3389 3390 +1
> input_register_device 1291 1292 +1
> ieee80211_rx_mgmt_beacon 6109 6110 +1
> hpet_open 491 492 +1
> alloc_fd 376 377 +1
> acpi_extract_apple_properties 973 974 +1
> zhaoxin_pmu_handle_irq 776 775 -1
> zhaoxin_arch_events_quirk 137 136 -1
> x86_pmu_handle_irq 484 483 -1
> x86_pmu_enable_all 382 381 -1
> wq_update_node_max_active 607 606 -1
> uncore_pmu_hrtimer 261 260 -1
> svc_create_pooled 790 789 -1
> show_free_areas 2757 2756 -1
> setup_swap_info 235 234 -1
> sched_update_numa 435 434 -1
> rdmacg_resource_set_max 894 893 -1
> rcu_report_exp_cpu_mult 175 174 -1
> perf_event_print_debug 1219 1218 -1
> p4_pmu_handle_irq 682 681 -1
> node_dev_init 189 188 -1
> memory_tier_late_init 1763 1762 -1
> mem_init 520 519 -1
> kswapd_init 110 109 -1
> kmem_cache_init 369 368 -1
> kcompactd_init 242 241 -1
> intel_gt_mcr_init 886 885 -1
> intel_get_event_constraints 846 845 -1
> intel_arch_events_quirk 137 136 -1
> input_leds_connect 724 723 -1
> init_mm_internals 654 653 -1
> init_gi_nodes 132 131 -1
> ieee80211_subif_start_xmit 1127 1126 -1
> housekeeping_init 153 152 -1
> gen11_gt_irq_handler 911 910 -1
> elf_coredump_extra_notes_size 107 106 -1
> do_migrate_pages 807 806 -1
> cpc_write_ffh 167 166 -1
> cgroup_subtree_control_write 997 996 -1
> cgroup_print_ss_mask 182 181 -1
> cgroup_post_fork 614 613 -1
> amd_pmu_v2_handle_irq 1101 1100 -1
> amd_pmu_enable_all 139 138 -1
> alloc_buffer 1358 1357 -1
> ahci_save_initial_config 1164 1163 -1
> add_to_avail_list 310 309 -1
> __copy_xstate_to_uabi_buf 2457 2456 -1
> xhci_bus_resume 1011 1009 -2
> xfeature_get_offset 137 135 -2
> x86_release_hardware 289 287 -2
> weighted_interleave_nodes 311 309 -2
> vmalloc_info_show 1000 998 -2
> snapshot_write_next 2486 2484 -2
> snapshot_read_next 626 624 -2
> show_numa_map 980 978 -2
> scsi_show_rq 800 798 -2
> rcu_gp_cleanup 1556 1554 -2
> rcec_assoc_rciep.isra 116 114 -2
> perf_output_sample_regs 181 179 -2
> padata_do_multithreaded 867 865 -2
> p4_pmu_enable_all 139 137 -2
> numa_nearest_node 210 208 -2
> node_read_distance 234 232 -2
> mce_read_aux 394 392 -2
> kcore_update_ram.isra 783 781 -2
> interleave_nodes 163 161 -2
> interleave_nid 217 215 -2
> intel_pmu_drain_pebs_icl 866 864 -2
> intel_gt_init_workarounds 4160 4158 -2
> ieee80211_add_rx_radiotap_header 2290 2288 -2
> icl_display_core_init 2340 2338 -2
> free_area_init 3984 3982 -2
> drv_change_sta_links 621 619 -2
> drop_slab 223 221 -2
> dma_channel_table_init 279 277 -2
> default_hugepagesz_setup 454 452 -2
> cgroup_release 302 300 -2
> cgroup_exit 416 414 -2
> cgroup_can_fork 1277 1275 -2
> amd_pmu_cpu_prepare 340 338 -2
> amd_pmu_check_overflow 173 171 -2
> amd_numa_init 892 890 -2
> alloc_workqueue 1792 1790 -2
> _ieee80211_set_active_links 1341 1339 -2
> __sync_rcu_exp_select_node_cpus 954 952 -2
> __log_error 494 492 -2
> __group_cpus_evenly 1378 1376 -2
> page_alloc_init_late 754 751 -3
> out_of_memory 1759 1756 -3
> ieee80211_vif_update_links 2506 2503 -3
> hugetlb_init 1571 1568 -3
> hugetlb_acct_memory.part 1112 1109 -3
> housekeeping_setup 764 761 -3
> shrink_dcache_sb 327 323 -4
> intel_dp_compute_link_config 1331 1327 -4
> elf_coredump_extra_notes_write 453 449 -4
> cpc_read_ffh 89 85 -4
> __do_sys_swapon 4497 4493 -4
> swapfile_init 220 215 -5
> __list_lru_init 179 174 -5
> ahci_reset_controller 308 302 -6
> regmap_field_init 135 128 -7
> mst_stream_compute_config 1659 1652 -7
> free_node_nr_active 165 158 -7
> drv_change_vif_links 635 628 -7
> core_guest_get_msrs 374 367 -7
> intel_psr_flush 985 977 -8
> do_kmem_cache_create 1208 1200 -8
> core_pmu_enable_all 402 394 -8
> __do_sys_swapoff 3799 3791 -8
> hugetlb_cgroup_free 127 117 -10
> compaction_proactiveness_sysctl_handler 301 291 -10
> __build_all_zonelists 229 219 -10
> numa_set_distance 578 567 -11
> ext4_fill_super 12858 12847 -11
> del_from_avail_list 220 209 -11
> x86_pmu_disable_all 422 410 -12
> weighted_interleave_nid 385 373 -12
> hugetlb_cgroup_read_numa_stat 607 595 -12
> check_hw_exists 1060 1048 -12
> cgroup_migrate_execute 1136 1124 -12
> sysctl_compaction_handler 196 183 -13
> mempolicy_sysfs_init 664 651 -13
> intel_drrs_activate 392 379 -13
> find_next_best_node 316 303 -13
> perf_assign_events 927 912 -15
> sched_init_numa 1884 1868 -16
> __pfx_lpit_read_residency_counter_us.part 16 - -16
> numa_init 739 722 -17
> fpu__init_system_xstate 3798 3774 -24
> low_power_idle_system_residency_us_show 130 105 -25
> lpit_read_residency_counter_us.part 191 - -191
> Total: Before=22509812, After=22509487, chg -0.00%
>
>
> * Code size shrinking ( gcc-11 for x86_64 with NR_CPUS=1024 ):
>
> $ ./scripts/bloat-o-meter vmlinux_old vmlinux_new
> add/remove: 0/0 grow/shrink: 11/126 up/down: 64/-475 (-411)
> Function old new delta
> alloc_buffer 1386 1408 +22
> intel_psr_invalidate 645 662 +17
> ieee80211_subif_start_xmit 1124 1129 +5
> ieee80211_rx_mgmt_beacon 6008 6013 +5
> __i915_gem_object_set_pages 567 572 +5
> numa_policy_init 569 572 +3
> intel_engines_init_mmio 3368 3370 +2
> cpc_write_ffh 157 159 +2
> hswep_uncore_sbox_msr_init_box 192 193 +1
> dev_change_proto_down_reason 153 154 +1
> alloc_fd 411 412 +1
> zhaoxin_arch_events_quirk 139 138 -1
> x86_pmu_enable_all 380 379 -1
> wq_update_node_max_active 631 630 -1
> sysctl_compaction_handler 201 200 -1
> svc_create_pooled 786 785 -1
> show_free_areas 2661 2660 -1
> setup_swap_info 234 233 -1
> sched_update_numa 435 434 -1
> rebind_subsystems 1310 1309 -1
> rdmacg_resource_set_max 867 866 -1
> rcu_report_exp_cpu_mult 176 175 -1
> rcu_gp_cleanup 1551 1550 -1
> p4_pmu_enable_all 136 135 -1
> node_dev_init 191 190 -1
> memory_tier_late_init 1929 1928 -1
> mem_init 533 532 -1
> kswapd_init 112 111 -1
> knc_pmu_handle_irq 650 649 -1
> kmem_cache_init 384 383 -1
> kcompactd_init 244 243 -1
> intel_pmu_handle_irq 1508 1507 -1
> intel_gt_mcr_init 909 908 -1
> intel_arch_events_quirk 139 138 -1
> input_leds_connect 736 735 -1
> init_mm_internals 678 677 -1
> init_gi_nodes 137 136 -1
> icl_display_core_init 2329 2328 -1
> hugetlb_cgroup_free 120 119 -1
> housekeeping_init 155 154 -1
> fpu__init_system_xstate 3089 3088 -1
> do_migrate_pages 826 825 -1
> core_guest_get_msrs 369 368 -1
> cgroup_subtree_control_write 1023 1022 -1
> cgroup_release 319 318 -1
> cgroup_exit 429 428 -1
> alloc_workqueue 1850 1849 -1
> ahci_save_initial_config 1139 1138 -1
> ahci_reset_controller 338 337 -1
> add_to_avail_list 320 319 -1
> __do_sys_swapon 4503 4502 -1
> xhci_bus_resume 1011 1009 -2
> xfeature_get_offset 144 142 -2
> x86_release_hardware 312 310 -2
> weighted_interleave_nid 458 456 -2
> vmalloc_info_show 1003 1001 -2
> uncore_pmu_hrtimer 264 262 -2
> snapshot_read_next 628 626 -2
> show_numa_map 979 977 -2
> scsi_show_rq 793 791 -2
> rcec_assoc_rciep.isra 116 114 -2
> perf_event_print_debug 1273 1271 -2
> page_alloc_init_late 771 769 -2
> padata_do_multithreaded 856 854 -2
> out_of_memory 1699 1697 -2
> numa_nearest_node 210 208 -2
> node_read_distance 236 234 -2
> mce_read_aux 394 392 -2
> kcore_update_ram.isra 781 779 -2
> interleave_nodes 188 186 -2
> interleave_nid 209 207 -2
> input_register_device 1248 1246 -2
> ieee80211_add_rx_radiotap_header 2252 2250 -2
> hpet_open 500 498 -2
> gen11_gt_irq_handler 867 865 -2
> free_area_init 3826 3824 -2
> force_qs_rnp 764 762 -2
> elf_coredump_extra_notes_size 107 105 -2
> drv_change_vif_links 639 637 -2
> drv_change_sta_links 606 604 -2
> drop_slab 209 207 -2
> dma_channel_table_init 286 284 -2
> default_hugepagesz_setup 456 454 -2
> core_pmu_enable_all 399 397 -2
> cgroup_post_fork 662 660 -2
> cgroup_can_fork 1397 1395 -2
> cfg80211_any_usable_channels 166 164 -2
> amd_put_event_constraints 151 149 -2
> amd_pmu_cpu_prepare 353 351 -2
> amd_pmu_check_overflow 171 169 -2
> amd_numa_init 891 889 -2
> alloc_pages_bulk_mempolicy_noprof 1553 1551 -2
> __sync_rcu_exp_select_node_cpus 961 959 -2
> __log_error 476 474 -2
> __do_sys_swapoff 3463 3461 -2
> x86_reserve_hardware 668 665 -3
> numa_init 697 694 -3
> intel_dp_compute_link_config 1224 1221 -3
> ieee80211_vif_update_links 2023 2020 -3
> hugetlb_init 1474 1471 -3
> shrink_dcache_sb 344 340 -4
> hugetlb_acct_memory.part 1113 1109 -4
> ext4_fill_super 14258 14254 -4
> elf_coredump_extra_notes_write 435 431 -4
> cpc_read_ffh 89 85 -4
> _ieee80211_set_active_links 1298 1294 -4
> swapfile_init 224 219 -5
> cgroup_propagate_control 342 337 -5
> cgroup_print_ss_mask 186 181 -5
> amd_pmu_enable_all 140 135 -5
> __list_lru_init 179 174 -5
> weighted_interleave_nodes 326 320 -6
> perf_output_sample_regs 172 166 -6
> housekeeping_setup 756 750 -6
> cgroup_migrate_execute 1179 1173 -6
> regmap_field_init 129 122 -7
> mst_stream_compute_config 1599 1592 -7
> lpit_read_residency_counter_us 309 302 -7
> free_node_nr_active 167 160 -7
> check_hw_exists 1041 1034 -7
> perf_assign_events 838 830 -8
> intel_pmu_init 14230 14222 -8
> snapshot_write_next 2467 2458 -9
> intel_psr_flush 976 967 -9
> compaction_proactiveness_sysctl_handler 299 289 -10
> __group_cpus_evenly 1355 1345 -10
> hugetlb_cgroup_read_numa_stat 634 623 -11
> del_from_avail_list 241 230 -11
> numa_set_distance 601 589 -12
> intel_drrs_activate 376 364 -12
> find_next_best_node 328 316 -12
> do_kmem_cache_create 1219 1205 -14
> intel_get_event_constraints 870 855 -15
> __build_all_zonelists 241 226 -15
> sched_init_numa 2010 1991 -19
> intel_gt_init_workarounds 4277 4257 -20
> amd_pmu_v2_handle_irq 1018 989 -29
> Total: Before=22357661, After=22357250, chg -0.00%
>
>
> * Code size shrinking ( clang-19 for x86_64 ):
>
> $ ./scripts/bloat-o-meter vmlinux_old vmlinux_new
> add/remove: 0/0 grow/shrink: 0/0 up/down: 0/0 (0)
> Function old new delta
> Total: Before=23144745, After=23144745, chg +0.00%
>
> * Code size shrinking ( clang-18 for x86_64 ):
>
> $ ./scripts/bloat-o-meter vmlinux_old vmlinux_new
> add/remove: 0/0 grow/shrink: 0/0 up/down: 0/0 (0)
> Function old new delta
> Total: Before=23106698, After=23106698, chg +0.00%
>
> * Code size shrinking ( clang-17 for x86_64 ):
>
> $ ./scripts/bloat-o-meter vmlinux_old vmlinux_new
> add/remove: 0/0 grow/shrink: 0/0 up/down: 0/0 (0)
> Function old new delta
> Total: Before=23106698, After=23106698, chg +0.00%
>
> * Code size shrinking ( gcc cross compiler for arm64 ):
>
> $ ./scripts/bloat-o-meter vmlinux_old vmlinux_new
> add/remove: 3/4 grow/shrink: 80/256 up/down: 832/-2776 (-1944)
> Function old new delta
> perf_output_sample 2180 2340 +160
> devlink_reload 640 720 +80
> devlink_remote_reload_actions_performed 72 132 +60
> __mark_chain_precision 4080 4124 +44
> force_qs_rnp 836 872 +36
> __perf_event_task_sched_in 548 580 +32
> sched_update_numa 428 452 +24
> numa_nearest_node 260 284 +24
> iproc_gpio_irq_handler 612 628 +16
> at803x_cable_test_get_status 472 488 +16
> rockchip_usb2phy_otg_sm_work 824 836 +12
> armv8pmu_handle_irq 368 380 +12
> vf610_gpio_irq_handler 280 288 +8
> rtm_new_nexthop 4632 4640 +8
> rtd_gpio_irq_handle 580 588 +8
> e843419@...0_0000e55c_6b0 - 8 +8
> e843419@...5_00004868_19f8 - 8 +8
> e843419@...3_000040f7_173c - 8 +8
> aqr_phy_led_polarity_set 208 216 +8
> alloc_charge_folio 680 688 +8
> wait_for_completion_interruptible_timeout 352 356 +4
> vgic_v3_set_redist_base 756 760 +4
> tegra_xhci_id_notify 164 168 +4
> tcs_tx_done 436 440 +4
> sunxi_sram_show 568 572 +4
> stm32_pmx_set_mux 208 212 +4
> states_equal 1352 1356 +4
> snapshot_write_next 2488 2492 +4
> shrink_lruvec 2752 2756 +4
> sched_domains_numa_masks_set 312 316 +4
> rpmh_rsc_invalidate 192 196 +4
> rockchip_gpio_probe 2648 2652 +4
> rcu_gp_fqs_loop 1224 1228 +4
> qcom_mpm_init 1368 1372 +4
> phylink_create 2304 2308 +4
> pfifo_fast_dequeue 1024 1028 +4
> perf_pending_task 336 340 +4
> owl_gpio_direction_input 236 240 +4
> numa_policy_init 680 684 +4
> numa_init 608 612 +4
> node_map_pfn_alignment 360 364 +4
> nand_maximize_ecc 412 416 +4
> mvpp2_flow_set_hek_fields 308 312 +4
> mvpp22_rss_context_create.isra 212 216 +4
> mtk_clk_register_plls 420 424 +4
> msm_config_group_get 560 564 +4
> mpc8xxx_probe 876 880 +4
> migrate_folio_add 276 280 +4
> max77620_gpio_irq_init_hw 156 160 +4
> list_lru_destroy 428 432 +4
> kvm_walk_nested_s2 1180 1184 +4
> kvm_pmu_nested_transition 264 268 +4
> kvm_arm_pmu_v3_set_attr 1092 1096 +4
> kvm_apply_hyp_relocations 152 156 +4
> ksz9031_of_load_skew_values.isra 400 404 +4
> kcompactd 784 788 +4
> its_create_device 944 948 +4
> init_mm_internals 796 800 +4
> hugetlb_vm_op_close 472 476 +4
> hugetlb_cma_reserve 724 728 +4
> hugetlb_cgroup_css_offline 400 404 +4
> hmat_register_target 360 364 +4
> hclge_clear_fd_rules_in_list 360 364 +4
> group_cpus_evenly 788 792 +4
> dwapb_gpio_resume 980 984 +4
> do_migrate_pages 800 804 +4
> devm_regmap_field_bulk_alloc 288 292 +4
> cgroup_apply_control_enable 784 788 +4
> ccu_nkmp_round_rate 404 408 +4
> ccu_nk_round_rate 232 236 +4
> ccu_mp_round_rate 632 636 +4
> build_overlap_sched_groups 1196 1200 +4
> bcm2835_gpio_irq_handler 368 372 +4
> asym_cpu_capacity_scan 904 908 +4
> armv8pmu_read_counter 216 220 +4
> aer_recover_work_func 316 320 +4
> __update_idle_core 312 316 +4
> __reset_isolation_pfn 524 528 +4
> __regmap_init 3208 3212 +4
> __netdev_update_lower_level 132 136 +4
> __hugetlb_cgroup_charge_cgroup 648 652 +4
> __enqueue_entity 496 500 +4
> __arm64_sys_process_mrelease 588 592 +4
> wq_update_node_max_active 624 620 -4
> weighted_interleave_nodes 308 304 -4
> wait_for_completion_state 492 488 -4
> update_64bit_reg 76 72 -4
> unregister_node 264 260 -4
> uniphier_u3ssphy_init 528 524 -4
> tegra_xusb_mbox_thread 1152 1148 -4
> tegra_gpio_irq_handler 692 688 -4
> tegra186_pmc_wake_syscore_suspend 932 928 -4
> tegra186_pmc_wake_syscore_resume 360 356 -4
> sysctl_compaction_handler 272 268 -4
> sync_rcu_exp_select_cpus 676 672 -4
> swapfile_init 232 228 -4
> svc_process_common 1456 1452 -4
> sunxi_sram_claim 336 332 -4
> sunxi_pmx_request 904 900 -4
> sunxi_pinctrl_irq_handler 384 380 -4
> stm32_pconf_dbg_show 900 896 -4
> snapshot_read_next 568 564 -4
> smsm_intr 296 292 -4
> show_free_areas 2716 2712 -4
> sh_pfc_register_pinctrl 392 388 -4
> sh_pfc_pinconf_set 788 784 -4
> rockchip_usb2phy_probe 2520 2516 -4
> rockchip_usb2phy_power_off 200 196 -4
> rockchip_pcie_intx_handler 260 256 -4
> rockchip_irq_demux 432 428 -4
> remove_pool_hugetlb_folio 288 284 -4
> relax_cpu_ftr_reg 144 140 -4
> regmap_field_alloc 188 184 -4
> regmap_exit 372 368 -4
> rcu_report_exp_cpu_mult 228 224 -4
> rcec_assoc_rciep.isra 108 104 -4
> qh_urb_transaction 1164 1160 -4
> qcom_mpm_handler 284 280 -4
> qcom_l3_cache__handle_irq 188 184 -4
> phylink_validate_mask 288 284 -4
> pfifo_fast_reset 344 340 -4
> owl_gpio_irq_unmask 280 276 -4
> out_of_memory 1408 1404 -4
> node_read_distance 276 272 -4
> nand_extract_bits 184 180 -4
> mvpp2_ethtool_rxfh_get 628 624 -4
> mvpp22_port_rss_init 320 316 -4
> mvebu_sei_handle_cascade_irq 324 320 -4
> mvebu_pic_handle_cascade_irq 236 232 -4
> mtk_smi_larb_config_port_gen2_general 476 472 -4
> mtk_pll_set_rate 416 412 -4
> msm_pinmux_set_mux 1132 1128 -4
> mpc8xxx_gpio_irq_cascade 160 156 -4
> mobiveil_pcie_isr 576 572 -4
> mobiveil_pcie_host_probe 1120 1116 -4
> meson_vclk_gate_is_enabled 156 152 -4
> meson_vclk_div_recalc_rate 196 192 -4
> meson_vclk_div_is_enabled 156 152 -4
> meson_clk_cpu_dyndiv_recalc_rate 196 192 -4
> memory_numa_stat_show 444 440 -4
> memcg_reparent_list_lrus 612 608 -4
> mem_cgroup_css_released 68 64 -4
> max77620_gpio_irqhandler 256 252 -4
> kvm_vcpu_pmu_enable_el0 164 160 -4
> kvm_vcpu_pmu_disable_el0 172 168 -4
> kvm_pmu_hyp_counter_mask 188 184 -4
> kvm_pmu_handle_pmcr 340 336 -4
> kvm_pmu_create_perf_event 800 796 -4
> kvm_compute_layout 364 360 -4
> kvm_auth_eretax 908 904 -4
> ksz9x31_cable_test_get_status 924 920 -4
> its_vpe_irq_domain_deactivate 312 308 -4
> ipi_mux_process 176 172 -4
> interleave_nid 264 260 -4
> init_cgroup_housekeeping 252 248 -4
> imx_pgc_power_up 864 860 -4
> imx_pgc_power_down 876 872 -4
> imx_irqsteer_resume 228 224 -4
> imx_irqsteer_irq_handler 440 436 -4
> imx_intmux_runtime_resume 204 200 -4
> imx_intmux_irq_handler 288 284 -4
> iio_free_chan_devattr_list 148 144 -4
> iio_device_add_info_mask_type 352 348 -4
> idle_cull_fn 428 424 -4
> hugetlb_init 1504 1500 -4
> hugetlb_cgroup_read_numa_stat 620 616 -4
> hugetlb_cgroup_css_alloc 432 428 -4
> hugetlb_acct_memory.part 1104 1100 -4
> housekeeping_init 192 188 -4
> hmat_parse_subtable 2152 2148 -4
> hmat_init 1000 996 -4
> hclge_config_key.constprop 772 768 -4
> get_reg_by_id 200 196 -4
> free_shrinker_info 240 236 -4
> free_area_init 3816 3812 -4
> fmt_stack_mask.constprop 192 188 -4
> fmt_reg_mask.constprop 188 184 -4
> fdget 312 308 -4
> enetc_msix 248 244 -4
> enetc_alloc_rx_resources 356 352 -4
> ehci_hrtimer_func 284 280 -4
> dwapb_do_irq 316 312 -4
> drop_slab 284 280 -4
> devm_regmap_field_alloc 180 176 -4
> demote_store 1656 1652 -4
> default_hugepagesz_setup 504 500 -4
> current_objcg_update 484 480 -4
> cpu_pm_pmu_setup 228 224 -4
> cpc_read_ffh 256 252 -4
> compute_tlb_inval_range 512 508 -4
> compaction_proactiveness_sysctl_handler 264 260 -4
> cgroup_setup_root 760 756 -4
> cgroup_propagate_control 388 384 -4
> cgroup_print_ss_mask 180 176 -4
> brcmstb_gpio_irq_handler 456 452 -4
> bcmasp_netfilt_suspend 1144 1140 -4
> bcm7120_l2_intc_irq_handle 396 392 -4
> bcm7038_l1_irq_handle 360 356 -4
> bcm2835_gpio_irq_handle_bank 168 164 -4
> armpmu_request_irq 728 724 -4
> arm_smmu_probe_device 2000 1996 -4
> aqr107_config_init 556 552 -4
> alloc_workqueue 1840 1836 -4
> alloc_pool_huge_folio 324 320 -4
> alloc_gigantic_folio.isra 612 608 -4
> alloc_fd 476 472 -4
> ahci_save_initial_config 1080 1076 -4
> ahci_reset_controller 392 388 -4
> add_reservation_in_range 872 868 -4
> _regmap_raw_multi_reg_write 384 380 -4
> __show_mem 244 240 -4
> __pi___parse_cmdline 968 964 -4
> __nvmem_cell_entry_write 824 820 -4
> __netdev_update_upper_level 136 132 -4
> __mem_cgroup_free 228 224 -4
> __list_lru_init 288 284 -4
> __invalidate_reclaim_iterators 144 140 -4
> __hmat_register_target_initiators.constprop 172 168 -4
> __group_cpus_evenly 1532 1528 -4
> __arm64_sys_swapon 4148 4144 -4
> __arm64_sys_swapoff 3676 3672 -4
> __aer_print_error 524 520 -4
> vmalloc_info_show 1080 1072 -8
> vgic_v3_dispatch_sgi 348 340 -8
> trans_pgd_idmap_page 436 428 -8
> task_numa_migrate.isra 1980 1972 -8
> stm32_pconf_set_speed 272 264 -8
> stm32_pconf_set_bias 272 264 -8
> stm32_pconf_get_speed 132 124 -8
> sprd_mux_helper_set_parent 216 208 -8
> sprd_div_helper_set_rate 244 236 -8
> shrink_slab 1128 1120 -8
> setup_swap_info 252 244 -8
> sdhci_arasan_syscon_write.isra 196 188 -8
> scsi_show_rq 776 768 -8
> rockchip_usb2phy_power_on 348 340 -8
> rockchip_usb2phy_clk480m_unprepare 108 100 -8
> rockchip_usb2phy_clk480m_prepared 208 200 -8
> rcu_gp_cleanup 1428 1420 -8
> rcar_gen4_cpg_clk_register 1196 1188 -8
> owl_mux_set_parent 192 184 -8
> owl_mux_helper_set_parent 204 196 -8
> owl_divider_helper_set_rate 232 224 -8
> numa_set_distance 540 532 -8
> mux_set_parent 200 192 -8
> musb_interrupt 3540 3532 -8
> meson_vclk_gate_disable 96 88 -8
> meson_vclk_div_set_rate 152 144 -8
> memory_tier_late_init 220 212 -8
> memcg_list_lru_alloc 692 684 -8
> kvm_pmu_vcpu_reset 196 188 -8
> ksz886x_cable_test_get_status 996 988 -8
> kswapd_init 152 144 -8
> input_dev_toggle 388 380 -8
> hugetlb_cgroup_free 168 160 -8
> housekeeping_setup 820 812 -8
> gic_set_affinity 912 904 -8
> free_node_nr_active 196 188 -8
> establish_demotion_targets 1060 1052 -8
> e843419@...9_000035b8_450 8 - -8
> e843419@...3_000023a7_1870 8 - -8
> dw_handle_msi_irq 220 212 -8
> dma_channel_table_init 412 404 -8
> del_from_avail_list 348 340 -8
> check_update_ftr_reg 388 380 -8
> cgroup_release 300 292 -8
> cgroup_exit 372 364 -8
> cgroup_can_fork 1144 1136 -8
> ccu_phase_set_phase 284 276 -8
> ccu_mux_helper_set_parent 216 208 -8
> ccu_mult_set_rate 396 388 -8
> ccu_div_set_rate 236 228 -8
> bcm2835_clock_choose_div 148 140 -8
> balloon_init 596 588 -8
> alloc_shrinker_info 476 468 -8
> alloc_pages_bulk_mempolicy_noprof 1304 1296 -8
> add_to_avail_list 392 384 -8
> __cpg_z_clk_register 340 332 -8
> __clk_lucid_pll_postdiv_set_rate 368 360 -8
> xhci_bus_resume 1204 1192 -12
> task_scan_start 340 328 -12
> stm32_pmx_set_mode 376 364 -12
> stm32_pmx_get_mode 240 228 -12
> set_max_huge_pages 1016 1004 -12
> set_id_reg 804 792 -12
> sched_init_numa 2024 2012 -12
> rockchip_usb2phy_bvalid_irq 284 272 -12
> rebind_subsystems 1136 1124 -12
> pll_get_refin 280 268 -12
> mpll_recalc_rate 288 276 -12
> meson_vid_pll_div_recalc_rate 352 340 -12
> meson_clk_pll_recalc_rate 412 400 -12
> init_cpu_ftr_reg 620 608 -12
> i2c_dw_handle_tx_abort 304 292 -12
> ccu_nk_set_rate 488 476 -12
> ccu_mp_set_rate 464 452 -12
> bcmasp_netfilt_wr_m_wake.part.isra 576 564 -12
> __pack 488 476 -12
> weighted_interleave_nid 416 400 -16
> walk_s1 844 828 -16
> uniphier_u3hsphy_init 952 936 -16
> task_scan_max 356 340 -16
> shrink_dcache_sb 408 392 -16
> rtd_pconf_parse_conf 1232 1216 -16
> rockchip_usb2phy_otg_mux_irq 308 292 -16
> rockchip_usb2phy_clk480m_prepare 316 300 -16
> rockchip_muxgrf_set_parent 128 112 -16
> regmap_field_bulk_alloc 304 288 -16
> mvpp2_probe 3912 3896 -16
> meson_vclk_gate_enable 252 236 -16
> meson_vclk_div_enable 188 172 -16
> meson_vclk_div_disable 184 168 -16
> meson_clk_pll_is_enabled 372 356 -16
> meson_clk_pll_init 284 268 -16
> meson_clk_pcie_pll_enable 284 268 -16
> meson_clk_cpu_dyndiv_set_rate 276 260 -16
> cgroup_migrate_execute 1064 1048 -16
> ccu_nkm_set_rate 560 544 -16
> __unpack 412 396 -16
> __sync_rcu_exp_select_node_cpus 932 916 -16
> mpll_set_rate 280 260 -20
> sprd_pll_set_rate 1312 1288 -24
> rockchip_usb2phy_sm_work 580 556 -24
> rockchip_usb2phy_linestate_irq 404 380 -24
> meson_clk_pll_set_rate 644 620 -24
> meson_clk_dualdiv_set_rate 440 416 -24
> ccu_nm_set_rate 920 896 -24
> sprd_pll_recalc_rate 936 908 -28
> meson_clk_dualdiv_recalc_rate 540 512 -28
> ccu_nkmp_set_rate 784 756 -28
> __arm_smmu_cmdq_poll_set_valid_map 324 296 -28
> mpll_init 344 312 -32
> meson_clk_pll_disable 300 268 -32
> select_task_rq_fair 5956 5916 -40
> rockchip_usb2phy_init 1040 1000 -40
> svc_create_pooled 812 768 -44
> rockchip_usb2phy_id_irq 716 668 -48
> meson_clk_pll_enable 764 700 -64
> rockchip_usb2phy_irq 1204 1128 -76
> task_numa_fault 3760 3676 -84
> __devlink_reload_stats_update 116 - -116
> rockchip_chg_detect_work 1684 1564 -120
> perf_output_sample_regs 212 - -212
> Total: Before=31660668, After=31658724, chg -0.01%
>
>
> Every compiler, architectures combinations above can shrink the code
> size around 1k, except clang, which doesn't change anything before and
> after the change.
>
> Analyzation of multiple functions of gcc-13 on x86_64 are performed,
> trying to summarize what's the positive/negative effect of this change.
>
> * free_acpi_perf_data
> From bloat-o-meter, we can see the function has been shrink by 1 byte.
> ...
> free_acpi_perf_data 75 74 -1
> ...
>
> Disasembly it using
> $ objdump --disassemble=free_acpi_perf_data vmlinux_old > free_acpi_perf_data.old
> ...
> ffffffff81d632c3: 74 1a je ffffffff81d632df <free_acpi_perf_data+0x3f>
> ffffffff81d632c5: 48 89 f8 mov %rdi,%rax
> ffffffff81d632c8: 48 d3 e0 shl %cl,%rax
> ffffffff81d632cb: 48 f7 d8 neg %rax
> ffffffff81d632ce: 48 21 d0 and %rdx,%rax
> ffffffff81d632d1: 74 0c je ffffffff81d632df <free_acpi_perf_data+0x3f>
> ...
>
> $ objdump --disassemble=free_acpi_perf_data vmlinux_new > free_acpi_perf_data.new
> ...
> ffffffff81d62ec5: 74 17 je ffffffff81d62ede <free_acpi_perf_data+0x3e>
> ffffffff81d62ec7: 48 89 fa mov %rdi,%rdx
> ffffffff81d62eca: 48 d3 e2 shl %cl,%rdx
> ffffffff81d62ecd: 48 21 c2 and %rax,%rdx
> ffffffff81d62ed0: 74 0c je ffffffff81d62ede <free_acpi_perf_data+0x3e>
> ...
>
> Revert GENMASK() saves one negation here.
>
> * tick_clock_notify
> From bloat-o-meter, the shrink size is
> ...
> tick_clock_notify 109 108 -1
> ...
>
> $ objdump --disassemble=tick_clock_notify vmlinux_old > tick_clock_notify.old
> ...
> ffffffff81360694: 48 8b 05 05 fc 4d 01 mov 0x14dfc05(%rip),%rax # ffffffff828402a0 <__cpu_possible_mask>
> ffffffff8136069b: 48 85 c0 test %rax,%rax
> ffffffff8136069e: 74 58 je ffffffff813606f8 <tick_clock_notify+0x68>
> ffffffff813606a0: f3 48 0f bc c0 tzcnt %rax,%rax
> ffffffff813606a5: 89 c1 mov %eax,%ecx
> ffffffff813606a7: 83 f8 3f cmp $0x3f,%eax
> ffffffff813606aa: 77 4c ja ffffffff813606f8 <tick_clock_notify+0x68>
> ffffffff813606ac: be 01 00 00 00 mov $0x1,%esi
> ffffffff813606b1: 48 c7 c2 c0 0a 02 00 mov $0x20ac0,%rdx
> ffffffff813606b8: 48 63 c1 movslq %ecx,%rax
> ffffffff813606bb: 48 8b 3c c5 a0 fb 83 mov -0x7d7c0460(,%rax,8),%rdi
> ffffffff813606c2: 82
> ffffffff813606c3: 48 01 d7 add %rdx,%rdi
> ffffffff813606c6: f0 80 8f e0 00 00 00 lock orb $0x1,0xe0(%rdi)
> ffffffff813606cd: 01
> ffffffff813606ce: 83 c1 01 add $0x1,%ecx
> ffffffff813606d1: 48 63 c1 movslq %ecx,%rax
> ffffffff813606d4: 48 83 f8 3f cmp $0x3f,%rax
> ffffffff813606d8: 77 1e ja ffffffff813606f8 <tick_clock_notify+0x68>
> ffffffff813606da: 48 89 f0 mov %rsi,%rax
> ffffffff813606dd: 48 d3 e0 shl %cl,%rax
> ffffffff813606e0: 48 f7 d8 neg %rax
> ffffffff813606e3: 48 23 05 b6 fb 4d 01 and 0x14dfbb6(%rip),%rax # ffffffff828402a0 <__cpu_possible_mask>
> ...
>
> $ objdump --disassemble=tick_clock_notify vmlinux_new > tick_clock_notify.new
> ...
> ffffffff81360564: 48 8b 05 35 fd 4d 01 mov 0x14dfd35(%rip),%rax # ffffffff828402a0 <__cpu_possible_mask>
> ffffffff8136056b: 48 85 c0 test %rax,%rax
> ffffffff8136056e: 74 57 je ffffffff813605c7 <tick_clock_notify+0x67>
> ffffffff81360570: f3 48 0f bc c0 tzcnt %rax,%rax
> ffffffff81360575: 89 c1 mov %eax,%ecx
> ffffffff81360577: 83 f8 3f cmp $0x3f,%eax
> ffffffff8136057a: 77 4b ja ffffffff813605c7 <tick_clock_notify+0x67>
> ffffffff8136057c: 48 c7 c6 ff ff ff ff mov $0xffffffffffffffff,%rsi
> ffffffff81360583: 48 c7 c2 c0 0a 02 00 mov $0x20ac0,%rdx
> ffffffff8136058a: 48 63 c1 movslq %ecx,%rax
> ffffffff8136058d: 48 8b 3c c5 a0 fb 83 mov -0x7d7c0460(,%rax,8),%rdi
> ffffffff81360594: 82
> ffffffff81360595: 48 01 d7 add %rdx,%rdi
> ffffffff81360598: f0 80 8f e0 00 00 00 lock orb $0x1,0xe0(%rdi)
> ffffffff8136059f: 01
> ffffffff813605a0: 83 c1 01 add $0x1,%ecx
> ffffffff813605a3: 48 63 c1 movslq %ecx,%rax
> ffffffff813605a6: 48 83 f8 3f cmp $0x3f,%rax
> ffffffff813605aa: 77 1b ja ffffffff813605c7 <tick_clock_notify+0x67>
> ffffffff813605ac: 48 89 f0 mov %rsi,%rax
> ffffffff813605af: 48 d3 e0 shl %cl,%rax
> ffffffff813605b2: 48 23 05 e7 fc 4d 01 and 0x14dfce7(%rip),%rax # ffffffff828402a0 <__cpu_possible_mask>
> ...
>
> One negation is saved here, I also try to reproduce it on godbolt, the
> link is https://godbolt.org/z/ac4h1ov7f .
>
> For negative impact, we pick the following function
>
> * kstat_irqs_desc
> ...
> kstat_irqs_desc 118 122 +4
> ...
>
> $ objdump --disassemble=kstat_irqs_desc vmlinux_old > kstat_irqs_desc.old
> ...
> Disassembly of section .text:
>
> ffffffff8130c320 <kstat_irqs_desc>:
> ffffffff8130c320: f3 0f 1e fa endbr64
> ffffffff8130c324: f7 47 78 00 02 02 00 testl $0x20200,0x78(%rdi)
> ffffffff8130c32b: 74 5b je ffffffff8130c388 <kstat_irqs_desc+0x68>
> ffffffff8130c32d: 48 8b 36 mov (%rsi),%rsi
> ffffffff8130c330: 31 d2 xor %edx,%edx
> ffffffff8130c332: 48 85 f6 test %rsi,%rsi
> ffffffff8130c335: 74 4a je ffffffff8130c381 <kstat_irqs_desc+0x61>
> ffffffff8130c337: f3 48 0f bc c6 tzcnt %rsi,%rax
> ffffffff8130c33c: 89 c1 mov %eax,%ecx
> ffffffff8130c33e: 83 f8 3f cmp $0x3f,%eax
> ffffffff8130c341: 77 3e ja ffffffff8130c381 <kstat_irqs_desc+0x61>
> ffffffff8130c343: 41 b8 01 00 00 00 mov $0x1,%r8d
> ffffffff8130c349: 48 8b 7f 60 mov 0x60(%rdi),%rdi
> ffffffff8130c34d: 48 63 c1 movslq %ecx,%rax
> ffffffff8130c350: 83 c1 01 add $0x1,%ecx
> ffffffff8130c353: 48 8b 04 c5 a0 fb 83 mov -0x7d7c0460(,%rax,8),%rax
> ffffffff8130c35a: 82
> ffffffff8130c35b: 03 14 38 add (%rax,%rdi,1),%edx
> ffffffff8130c35e: 48 63 c1 movslq %ecx,%rax
> ffffffff8130c361: 48 83 f8 3f cmp $0x3f,%rax
> ffffffff8130c365: 77 1a ja ffffffff8130c381 <kstat_irqs_desc+0x61>
> ffffffff8130c367: 4c 89 c0 mov %r8,%rax
> ffffffff8130c36a: 48 d3 e0 shl %cl,%rax
> ffffffff8130c36d: 48 f7 d8 neg %rax
> ffffffff8130c370: 48 21 f0 and %rsi,%rax
> ffffffff8130c373: 74 0c je ffffffff8130c381 <kstat_irqs_desc+0x61>
> ffffffff8130c375: f3 48 0f bc c0 tzcnt %rax,%rax
> ffffffff8130c37a: 89 c1 mov %eax,%ecx
> ffffffff8130c37c: 83 f8 3f cmp $0x3f,%eax
> ffffffff8130c37f: 76 cc jbe ffffffff8130c34d <kstat_irqs_desc+0x2d>
> ffffffff8130c381: 89 d0 mov %edx,%eax
> ffffffff8130c383: e9 58 93 e8 00 jmp ffffffff821956e0 <__x86_return_thunk>
> ffffffff8130c388: f6 47 7d 20 testb $0x20,0x7d(%rdi)
> ffffffff8130c38c: 75 9f jne ffffffff8130c32d <kstat_irqs_desc+0xd>
> ffffffff8130c38e: 8b 97 88 00 00 00 mov 0x88(%rdi),%edx
> ffffffff8130c394: eb eb jmp ffffffff8130c381 <kstat_irqs_desc+0x61>
> ...
>
> $ objdump --disassemble=kstat_irqs_desc vmlinux_new >
> kstat_irqs_desc.new
> ...
> Disassembly of section .text:
>
> ffffffff8130c240 <kstat_irqs_desc>:
> ffffffff8130c240: f3 0f 1e fa endbr64
> ffffffff8130c244: f7 47 78 00 02 02 00 testl $0x20200,0x78(%rdi)
> ffffffff8130c24b: 74 57 je ffffffff8130c2a4 <kstat_irqs_desc+0x64>
> ffffffff8130c24d: 48 8b 36 mov (%rsi),%rsi
> ffffffff8130c250: 31 c0 xor %eax,%eax
> ffffffff8130c252: 48 85 f6 test %rsi,%rsi
> ffffffff8130c255: 74 48 je ffffffff8130c29f <kstat_irqs_desc+0x5f>
> ffffffff8130c257: f3 48 0f bc d6 tzcnt %rsi,%rdx
> ffffffff8130c25c: 89 d1 mov %edx,%ecx
> ffffffff8130c25e: 83 fa 3f cmp $0x3f,%edx
> ffffffff8130c261: 77 52 ja ffffffff8130c2b5 <kstat_irqs_desc+0x75>
> ffffffff8130c263: 49 c7 c0 ff ff ff ff mov $0xffffffffffffffff,%r8
> ffffffff8130c26a: 48 8b 7f 60 mov 0x60(%rdi),%rdi
> ffffffff8130c26e: 48 63 d1 movslq %ecx,%rdx
> ffffffff8130c271: 83 c1 01 add $0x1,%ecx
> ffffffff8130c274: 48 8b 14 d5 a0 fb 83 mov -0x7d7c0460(,%rdx,8),%rdx
> ffffffff8130c27b: 82
> ffffffff8130c27c: 03 04 3a add (%rdx,%rdi,1),%eax
> ffffffff8130c27f: 48 63 d1 movslq %ecx,%rdx
> ffffffff8130c282: 48 83 fa 3f cmp $0x3f,%rdx
> ffffffff8130c286: 77 17 ja ffffffff8130c29f <kstat_irqs_desc+0x5f>
> ffffffff8130c288: 4c 89 c2 mov %r8,%rdx
> ffffffff8130c28b: 48 d3 e2 shl %cl,%rdx
> ffffffff8130c28e: 48 21 f2 and %rsi,%rdx
> ffffffff8130c291: 74 0c je ffffffff8130c29f <kstat_irqs_desc+0x5f>
> ffffffff8130c293: f3 48 0f bc d2 tzcnt %rdx,%rdx
> ffffffff8130c298: 89 d1 mov %edx,%ecx
> ffffffff8130c29a: 83 fa 3f cmp $0x3f,%edx
> ffffffff8130c29d: 76 cf jbe ffffffff8130c26e <kstat_irqs_desc+0x2e>
> ffffffff8130c29f: e9 3c 94 e8 00 jmp ffffffff821956e0 <__x86_return_thunk>
> ffffffff8130c2a4: f6 47 7d 20 testb $0x20,0x7d(%rdi)
> ffffffff8130c2a8: 75 a3 jne ffffffff8130c24d <kstat_irqs_desc+0xd>
> ffffffff8130c2aa: 8b 87 88 00 00 00 mov 0x88(%rdi),%eax
> ffffffff8130c2b0: e9 2b 94 e8 00 jmp ffffffff821956e0 <__x86_return_thunk>
> ffffffff8130c2b5: e9 26 94 e8 00 jmp ffffffff821956e0 <__x86_return_thunk>
> ...
>
> We can find that GENMASK() indeed saves 1 negation and one "mov", but at
> thee same time it generate one more "jmp" and make another "jmp"
> instruction become "e9 2b 94 e8 00" instead of "eb eb".
>
> * nr_processes
> $ objdump --disassemble=nr_processes vmlinux_old > nr_processes.old
> ...
> ffffffff812873c3: 77 1a ja ffffffff812873df <nr_processes+0x5f>
> ffffffff812873c5: 4c 89 c0 mov %r8,%rax
> ffffffff812873c8: 48 d3 e0 shl %cl,%rax
> ffffffff812873cb: 48 f7 d8 neg %rax
> ffffffff812873ce: 48 21 d0 and %rdx,%rax
> ffffffff812873d1: 74 0c je ffffffff812873df <nr_processes+0x5f>
> ffffffff812873d3: f3 48 0f bc c0 tzcnt %rax,%rax
> ffffffff812873d8: 89 c1 mov %eax,%ecx
> ffffffff812873da: 83 f8 3f cmp $0x3f,%eax
> ffffffff812873dd: 76 cc jbe ffffffff812873ab <nr_processes+0x2b>
> ffffffff812873df: 89 f0 mov %esi,%eax
> ffffffff812873e1: e9 fa e2 f0 00 jmp ffffffff821956e0 <__x86_return_thunk>
> ...
>
> $ objdump --disassemble=nr_processes vmlinux_new > nr_processes.new
> ...
> ffffffff812873c4: 77 1a ja ffffffff812873e0 <nr_processes+0x60>
> ffffffff812873c6: 4c 89 c6 mov %r8,%rsi
> ffffffff812873c9: 48 d3 e6 shl %cl,%rsi
> ffffffff812873cc: 48 89 f1 mov %rsi,%rcx
> ffffffff812873cf: 48 21 c1 and %rax,%rcx
> ffffffff812873d2: 74 0c je ffffffff812873e0 <nr_processes+0x60>
> ffffffff812873d4: f3 48 0f bc f1 tzcnt %rcx,%rsi
> ffffffff812873d9: 89 f1 mov %esi,%ecx
> ffffffff812873db: 83 fe 3f cmp $0x3f,%esi
> ffffffff812873de: 76 cc jbe ffffffff812873ac <nr_processes+0x2c>
> ffffffff812873e0: 89 d0 mov %edx,%eax
> ffffffff812873e2: e9 f9 e2 f0 00 jmp ffffffff821956e0 <__x86_return_thunk>
> ...
>
> GENMASK() can save 1 negation but generate 1 more "mov" thus adds 1 more
> register to use.
>
> In summary, GENMASK() can elimate 1 negation for almost every use cases,
> but some use cases may generate additional "mov" or register in use.
> The use of "~_UL(0) << (l)" may even result in use of %r* registers instead of
> using $e* which is 32 bits registers, because compiler can't make
> assumption that the higher bits are zeroes. ( I'm not super sure whether
> it's the true cause, let me know if anything needs to be corrected or
> need more tests, thanks. )
>
> v1 -> v2:
> - Refer the patch explicitly as a revert of commit c32ee3d
> - Squash commits into 1 commit
> - Perform compilation for numerous compilers, architectures and
> compare code size shrink for each of them
> - Perform cpu-heavy workload test inside x86_64 VM and ARM64 VM
> - Analyze the result of disassembly of several small use cases
>
> ---
> include/uapi/linux/bits.h | 6 ++----
> 1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/include/uapi/linux/bits.h b/include/uapi/linux/bits.h
> index 5ee30f882736..39e344a1227e 100644
> --- a/include/uapi/linux/bits.h
> +++ b/include/uapi/linux/bits.h
> @@ -5,12 +5,10 @@
> #define _UAPI_LINUX_BITS_H
>
> #define __GENMASK(h, l) \
> - (((~_UL(0)) - (_UL(1) << (l)) + 1) & \
> - (~_UL(0) >> (__BITS_PER_LONG - 1 - (h))))
> +(((~_UL(0)) << (l)) & (~_UL(0) >> (BITS_PER_LONG - 1 - (h))))
>
> #define __GENMASK_ULL(h, l) \
> - (((~_ULL(0)) - (_ULL(1) << (l)) + 1) & \
> - (~_ULL(0) >> (__BITS_PER_LONG_LONG - 1 - (h))))
> +(((~_ULL(0)) << (l)) & (~_ULL(0) >> (BITS_PER_LONG_LONG - 1 - (h))))
>
> #define __GENMASK_U128(h, l) \
> ((_BIT128((h)) << 1) - (_BIT128(l)))
> --
> 2.43.0
>
So I ammend the part for different warning levels. I test against
gcc-11, gcc-12, gcc-13, clang-17, clang-18 and clang-19.
For every version of gcc, no warnings or errors will be emitted for
-W=0,-W=1,-W=2.
For clang-17, clang-18, clang-19 with -W=0, the following warning will
be emitted. The compilation can be completed.
vmlinux.o: warning: objtool: .discard.annotate_insn: dodgy linker, sh_entsize != 8
However, it already exists before this patch is applied.
For clang-17, clang-18, clang-19 with -W=1, the following warnings and
errors will be emitted. The compilation can't be completed.
sound/core/seq/seq_clientmgr.c:2611:22: error: format string is not a string literal (potentially insecure) [-Werror,-Wformat-security]
2611 | snd_iprintf(buffer, msg);
mm/backing-dev.c:1094:58: error: format string is not a string literal (potentially insecure) [-Werror,-Wformat-security]
1094 | dev = device_create(&bdi_class, NULL, MKDEV(0, 0), bdi, bdi->dev_name);
drivers/gpu/drm/i915/display/intel_display.c:5298:47: error: format string is not a string literal (potentially insecure) [-Werror,-Wformat-security]
5298 | pipe_config_mismatch(p, fastset, crtc, name, chipname);
And even more, generally most of them complains about format string
isn't a string literal, and these errors and warnings will be emitted
before the patch is applied.
Fpr clang-17, clang-18 and clang-19 with -W=2, the following errors will
be emitted. The compilation can't be completed.
./include/linux/kcsan-checks.h:189:62: error: unused parameter 'ptr' [-Werror,-Wunused-parameter]
189 | static inline void __kcsan_check_access(const volatile void *ptr, size_t size,
| ^
./include/linux/kcsan-checks.h:189:74: error: unused parameter 'size' [-Werror,-Wunused-parameter]
189 | static inline void __kcsan_check_access(const volatile void *ptr, size_t size,
| ^
./include/linux/kcsan-checks.h:190:10: error: unused parameter 'type' [-Werror,-Wunused-parameter]
190 | int type) { }
| ^
./include/linux/kcsan-checks.h:203:42: error: unused parameter 'n' [-Werror,-Wunused-parameter]
203 | static inline void kcsan_atomic_next(int n) { }
| ^
./include/linux/kcsan-checks.h:204:56: error: unused parameter 'mask' [-Werror,-Wunused-parameter]
204 | static inline void kcsan_set_access_mask(unsigned long mask) { }
| ^
./include/linux/kcsan-checks.h:209:48: error: unused parameter 'ptr' [-Werror,-Wunused-parameter]
209 | kcsan_begin_scoped_access(const volatile void *ptr, size_t size, int type,
| ^
./include/linux/kcsan-checks.h:209:60: error: unused parameter 'size' [-Werror,-Wunused-parameter]
209 | kcsan_begin_scoped_access(const volatile void *ptr, size_t size, int type,
| ^
./include/linux/kcsan-checks.h:209:70: error: unused parameter 'type' [-Werror,-Wunused-parameter]
209 | kcsan_begin_scoped_access(const volatile void *ptr, size_t size, int type,
| ^
./include/linux/kcsan-checks.h:211:72: error: unused parameter 'sa' [-Werror,-Wunused-parameter]
211 | static inline void kcsan_end_scoped_access(struct kcsan_scoped_access *sa) { }
| ^
./include/linux/kcsan-checks.h:229:60: error: unused parameter 'ptr' [-Werror,-Wunused-parameter]
229 | static inline void kcsan_check_access(const volatile void *ptr, size_t size,
| ^
./include/linux/kcsan-checks.h:229:72: error: unused parameter 'size' [-Werror,-Wunused-parameter]
229 | static inline void kcsan_check_access(const volatile void *ptr, size_t size,
| ^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
Same as above, these errors already exists before the patch is applied.
In summary, none of these errors and warnings are caused by this patch.
I'll send other patches to fix those errors and warnings above, I don't
think they relate to this patch so I don't include them here, let me
know if they should be included, thanks!
Best regards,
I Hsin Cheng.
Powered by blists - more mailing lists