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Message-ID: <Z7ixSIQPlKkskgE7@vaxr-BM6660-BM6360>
Date: Sat, 22 Feb 2025 01:00:56 +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
>
Sorry I mistreat optimization level as warning level, I'll ammend that
part as soon as possible.
Best regards,
I Hsin Cheng.
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