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| author | Wanpeng Li <wanpeng.li@hotmail.com> | 2016-04-22 11:07:24 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-04-28 10:39:54 +0200 |
| commit | 594dd290cf5403a9a5818619dfff42d8e8e0518e (patch) | |
| tree | 31fa5c3c77c6c5cc293a91bd85cef310f0b988e6 /ipc/msgutil.c | |
| parent | sched/deadline: Fix a bug in dl_overflow() (diff) | |
| download | linux-594dd290cf5403a9a5818619dfff42d8e8e0518e.tar.xz linux-594dd290cf5403a9a5818619dfff42d8e8e0518e.zip | |
sched/cpufreq: Optimize cpufreq update kicker to avoid update multiple times
Sometimes delta_exec is 0 due to update_curr() is called multiple times,
this is captured by:
u64 delta_exec = rq_clock_task(rq) - curr->se.exec_start;
This patch optimizes the cpufreq update kicker by bailing out when nothing
changed, it will benefit the upcoming schedutil, since otherwise it will
(over)react to the special util/max combination.
Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1461316044-9520-1-git-send-email-wanpeng.li@hotmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'ipc/msgutil.c')
0 files changed, 0 insertions, 0 deletions