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| author | Xunlei Pang <xlpang@linux.alibaba.com> | 2018-06-20 18:18:34 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2018-07-03 09:17:29 +0200 |
| commit | f1d1be8aee6c461652aea8f58bedebaa73d7f4d3 (patch) | |
| tree | d3d3500dbd34f3232e2b95aa9a7d48bef910d485 /kernel/kthread.c | |
| parent | 512ac999d2755d2b7109e996a76b6fb8b888631d (diff) | |
| download | linux-f1d1be8aee6c461652aea8f58bedebaa73d7f4d3.tar.gz | |
sched/fair: Advance global expiration when period timer is restarted
When period gets restarted after some idle time, start_cfs_bandwidth()
doesn't update the expiration information, expire_cfs_rq_runtime() will
see cfs_rq->runtime_expires smaller than rq clock and go to the clock
drift logic, wasting needless CPU cycles on the scheduler hot path.
Update the global expiration in start_cfs_bandwidth() to avoid frequent
expire_cfs_rq_runtime() calls once a new period begins.
Signed-off-by: Xunlei Pang <xlpang@linux.alibaba.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Ben Segall <bsegall@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20180620101834.24455-2-xlpang@linux.alibaba.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/kthread.c')
0 files changed, 0 insertions, 0 deletions