diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2013-11-29 12:18:13 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-06-26 15:10:29 -0400 |
| commit | 3f8f4ae48f4023e1c53722b1dc1a7ab897cbca14 (patch) | |
| tree | 2677e4c998e385b214a5a04f09343133b2ebc8be /kernel | |
| parent | 7be9d6cd4b57ebd5b344e4a006c0aa6e7a08aba3 (diff) | |
nohz: Fix another inconsistency between CONFIG_NO_HZ=n and nohz=off
commit 0e576acbc1d9600cf2d9b4a141a2554639959d50 upstream.
If CONFIG_NO_HZ=n tick_nohz_get_sleep_length() returns NSEC_PER_SEC/HZ.
If CONFIG_NO_HZ=y and the nohz functionality is disabled via the
command line option "nohz=off" or not enabled due to missing hardware
support, then tick_nohz_get_sleep_length() returns 0. That happens
because ts->sleep_length is never set in that case.
Set it to NSEC_PER_SEC/HZ when the NOHZ mode is inactive.
Reported-by: Michal Hocko <mhocko@suse.cz>
Reported-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Rui Xiang <rui.xiang@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/time/tick-sched.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 638dadf6295f..67106f88dca1 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -296,8 +296,10 @@ static void tick_nohz_stop_sched_tick(struct tick_sched *ts) tick_do_timer_cpu = TICK_DO_TIMER_NONE; } - if (unlikely(ts->nohz_mode == NOHZ_MODE_INACTIVE)) + if (unlikely(ts->nohz_mode == NOHZ_MODE_INACTIVE)) { + ts->sleep_length = (ktime_t) { .tv64 = NSEC_PER_SEC/HZ }; return; + } if (need_resched()) return; |