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Date: Wed, 05 Mar 2008 17:26:25 -0500
From: Valdis.Kletnieks@...edu
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org
Subject: Re: 2.6.25-rc3-mm1 - PROFILE_LIKELY redux..
On Wed, 05 Mar 2008 10:02:21 PST, Andrew Morton said:
> at the top, so it'll be something else. Perhaps a `likely' snuck in via an
> inline in a header file. It would be better to add a #define DONT_DO_THAT
> at the top of arch/x86/kernel/vsyscall_64.c and
> arch/x86/vdso/vclock_gettime.c, then use that to defeat likely-profiling.
>
> arch/x86/kernel/vsyscall_64.c | 11 ++---------
> arch/x86/vdso/vclock_gettime.c | 11 ++---------
> include/linux/compiler.h | 3 ++-
> 3 files changed, 6 insertions(+), 19 deletions(-)
Confirming that this patch works and my system goes multi-user cleanly.
Actual numbers after about 10 minutes of uptime:
% wc -l /proc/likely_prof
2635 /proc/likely_prof
% grep '^[^ ]' /proc/likely_prof
Likely Profiling Results
[+- ] Type | # True | # False | Function:Filename@...e
+unlikely | 1| 0 in_dev_get()@:include/linux/inetdevice.h@185
+unlikely | 513| 0 dst_input()@:include/net/dst.h@254
-likely | 0| 148 ip6_mc_input()@:net/ipv6/ip6_input.c@271
-likely | 0| 1 sock_error()@:include/net/sock.h@...1
-likely | 851| 1219 tcp_transmit_skb()@:net/ipv4/tcp_output.c@493
+unlikely | 1| 0 signal_pending()@:include/linux/sched.h@...7
-likely | 0| 1172946 audit_syscall_entry()@:kernel/auditsc.c@...2
+unlikely | 1172716| 0 syscall_trace_enter()@:arch/x86/kernel/ptrace.c@...6
-likely | 0| 1173020 audit_syscall_exit()@:kernel/auditsc.c@...1
+unlikely | 1172831| 0 syscall_trace_leave()@:arch/x86/kernel/ptrace.c@...3
-likely | 0| 1272 audit_alloc()@:kernel/auditsc.c@841
+unlikely | 3| 0 icmp_unreach()@:net/ipv4/icmp.c@773
+unlikely | 2| 1 nf_ct_attach()@:net/netfilter/core.c@230
-likely | 0| 2 dst_gc_task()@:net/core/dst.c@82
+unlikely | 143| 61 fput_light()@:include/linux/file.h@77
+unlikely | 892| 424 _read_unlock_irqrestore()@:kernel/spinlock.c@375
+unlikely | 28| 0 sched_move_task()@:kernel/sched.c@...5
+unlikely | 28| 0 sched_move_task()@:kernel/sched.c@...8
+unlikely | 108| 0 verify_export_symbols()@:kernel/module.c@...1
+unlikely | 313| 0 verify_export_symbols()@:kernel/module.c@...3
+unlikely | 14| 0 ll_front_merge_fn()@:block/blk-merge.c@347
-likely | 17| 1150 audit_free()@:kernel/auditsc.c@...8
-likely | 17| 1174290 audit_get_context()@:kernel/auditsc.c@711
+unlikely | 33| 0 inotify_find_update_watch()@:fs/inotify.c@591
+unlikely | 4360| 775 kill_pid_info()@:kernel/signal.c@...5
+unlikely | 7239| 2767 next_pidmap()@:kernel/pid.c@194
+unlikely | 42009| 33683 copy_pte_range()@:mm/memory.c@510
-likely | 0| 1 qh_completions()@:drivers/usb/host/ehci-q.c@368
+unlikely | 19934| 0 ll_back_merge_fn()@:block/blk-merge.c@309
-likely | 927| 2323 load_elf_binary()@:fs/binfmt_elf.c@896
+unlikely | 2435| 875 pmd_alloc()@:include/linux/mm.h@862
+unlikely | 13| 12 psmouse_interrupt()@:drivers/input/mouse/psmouse-base.c@296
+unlikely | 70| 25 psmouse_interrupt()@:drivers/input/mouse/psmouse-base.c@292
-likely | 20| 80 qh_completions()@:drivers/usb/host/ehci-q.c@415
-likely | 0| 30 qh_completions()@:drivers/usb/host/ehci-q.c@319
-likely | 5| 14 submit_async()@:drivers/usb/host/ehci-q.c@975
+unlikely | 19| 2 qh_append_tds()@:drivers/usb/host/ehci-q.c@876
-likely | 6| 15 atapi_drain_needed()@:drivers/ata/libata-scsi.c@846
+unlikely | 27395| 18153 add_timer_randomness()@:drivers/char/random.c@628
+unlikely | 34665| 19948 bio_phys_segments()@:fs/bio.c@226
-likely | 347| 678 clocksource_adjust()@:kernel/time/timekeeping.c@418
-likely | 1| 4 __ata_qc_from_tag()@:include/linux/libata.h@...9
-likely | 0| 15 __cancel_work_timer()@:kernel/workqueue.c@490
+unlikely | 15638| 1127 queue_delayed_work_on()@:kernel/workqueue.c@233
+unlikely | 2| 0 srcu_notifier_chain_register()@:kernel/notifier.c@419
+unlikely | 6502| 2429 queue_work()@:kernel/workqueue.c@171
+unlikely | 9| 2 blocking_notifier_chain_register()@:kernel/notifier.c@212
+unlikely | 13631| 0 pre_schedule_rt()@:kernel/sched_rt.c@961
+unlikely | 591400| 443725 __update_curr()@:kernel/sched_fair.c@313
+unlikely | 233625| 205658 __switch_to()@:arch/x86/kernel/process_64.c@656
+unlikely | 313057| 126225 __switch_to()@:arch/x86/kernel/process_64.c@641
+unlikely | 313053| 126225 __switch_to()@:arch/x86/kernel/process_64.c@637
+unlikely | 467383| 0 sched_info_switch()@:kernel/sched_stats.h@230
+unlikely | 188448| 13628 pick_next_task_rt()@:kernel/sched_rt.c@522
+unlikely | 240619| 0 sched_info_queued()@:kernel/sched_stats.h@188
-likely | 61| 644 ifind()@:fs/inode.c@798
+unlikely | 258562| 61703 scheduler_tick()@:kernel/sched.c@...6
-likely | 61220| 241529 acct_update_integrals()@:kernel/tsacct.c@120
+unlikely | 1189922| 902477 kfree()@:mm/slab.c@...5
+unlikely | 23| 0 __rmqueue_fallback()@:mm/page_alloc.c@812
+unlikely | 14376| 9655 rt_policy()@:kernel/sched.c@140
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