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Code Issues Releases Wiki Activity

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>
This commit is contained in:
Thomas Gleixner 2013-11-29 12:18:13 +01:00 committed by Greg Kroah-Hartman
parent 7be9d6cd4b
commit 3f8f4ae48f
1 changed files with 3 additions and 1 deletions
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4
kernel/time/tick-sched.c
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@ -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;