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authorThomas Gleixner <tglx@linutronix.de>2013-11-29 12:18:13 +0100
committerThomas Gleixner <tglx@linutronix.de>2013-11-29 12:23:03 +0100
commit0e576acbc1d9600cf2d9b4a141a2554639959d50 (patch)
tree1d1322330afaa7cffdc39d2f898a7a0f02fa65c3 /kernel
parent70fe8217e17ddd058f9f043ae1cc0d86b1658a5c (diff)
downloadop-kernel-dev-0e576acbc1d9600cf2d9b4a141a2554639959d50.zip
op-kernel-dev-0e576acbc1d9600cf2d9b4a141a2554639959d50.tar.gz
nohz: Fix another inconsistency between CONFIG_NO_HZ=n and nohz=off
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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/time/tick-sched.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index a12df5a..ea20f7d 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -711,8 +711,10 @@ static bool can_stop_idle_tick(int cpu, struct tick_sched *ts)
return false;
}
- 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 false;
+ }
if (need_resched())
return false;
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