diff options
| author |   Mike Galbraith <mgalbraith@suse.de> | 2011-11-22 15:20:07 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2011-12-06 20:51:20 +0100 |
| commit | b39e66eaf9c573f38133e894256caeaf9fd2a528 (patch) | |
| tree | 316e239a62d589515bbe4c4b9b8c4fc8cac91715 /kernel/sched/sched.h | |
| parent | sched: Fix compile error for UP,!NOHZ (diff) | |
| download | linux-dev-b39e66eaf9c573f38133e894256caeaf9fd2a528.tar.xz linux-dev-b39e66eaf9c573f38133e894256caeaf9fd2a528.zip | |
sched: Save some hrtick_start_fair cycles
hrtick_start_fair() shows up in profiles even when disabled.
v3.0.6
taskset -c 3 pipe-test
PerfTop: 997 irqs/sec kernel:89.5% exact: 0.0% [1000Hz cycles], (all, CPU: 3)
------------------------------------------------------------------------------------------------
Virgin Patched
samples pcnt function samples pcnt function
_______ _____ ___________________________ _______ _____ ___________________________
2880.00 10.2% __schedule 3136.00 11.3% __schedule
1634.00 5.8% pipe_read 1615.00 5.8% pipe_read
1458.00 5.2% system_call 1534.00 5.5% system_call
1382.00 4.9% _raw_spin_lock_irqsave 1412.00 5.1% _raw_spin_lock_irqsave
1202.00 4.3% pipe_write 1255.00 4.5% copy_user_generic_string
1164.00 4.1% copy_user_generic_string 1241.00 4.5% __switch_to
1097.00 3.9% __switch_to 929.00 3.3% mutex_lock
872.00 3.1% mutex_lock 846.00 3.0% mutex_unlock
687.00 2.4% mutex_unlock 804.00 2.9% pipe_write
682.00 2.4% native_sched_clock 713.00 2.6% native_sched_clock
643.00 2.3% system_call_after_swapgs 653.00 2.3% _raw_spin_unlock_irqrestore
617.00 2.2% sched_clock_local 633.00 2.3% fsnotify
612.00 2.2% fsnotify 605.00 2.2% sched_clock_local
596.00 2.1% _raw_spin_unlock_irqrestore 593.00 2.1% system_call_after_swapgs
542.00 1.9% sysret_check 559.00 2.0% sysret_check
467.00 1.7% fget_light 472.00 1.7% fget_light
462.00 1.6% finish_task_switch 461.00 1.7% finish_task_switch
437.00 1.5% vfs_write 442.00 1.6% vfs_write
431.00 1.5% do_sync_write 428.00 1.5% do_sync_write
413.00 1.5% select_task_rq_fair 404.00 1.5% _raw_spin_lock_irq
386.00 1.4% update_curr 402.00 1.4% update_curr
385.00 1.4% rw_verify_area 389.00 1.4% do_sync_read
377.00 1.3% _raw_spin_lock_irq 378.00 1.4% vfs_read
369.00 1.3% do_sync_read 340.00 1.2% pipe_iov_copy_from_user
360.00 1.3% vfs_read 316.00 1.1% __wake_up_sync_key
* 342.00 1.2% hrtick_start_fair 313.00 1.1% __wake_up_common
Signed-off-by: Mike Galbraith <efault@gmx.de>
[ fixed !CONFIG_SCHED_HRTICK borkage ]
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1321971607.6855.17.camel@marge.simson.net
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched/sched.h')
| -rw-r--r-- | kernel/sched/sched.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 91810f0ee3af..d88545c667e3 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -885,6 +885,13 @@ static inline int hrtick_enabled(struct rq *rq) void hrtick_start(struct rq *rq, u64 delay); +#else + +static inline int hrtick_enabled(struct rq *rq) +{ + return 0; +} + #endif /* CONFIG_SCHED_HRTICK */ #ifdef CONFIG_SMP |