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nohz: disable tick_nohz_kick_tick() for now

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Impact: nohz powersavings and wakeup regression

commit fb02fbc14d (NOHZ: restart tick
device from irq_enter()) causes a serious wakeup regression.

While the patch is correct it does not take into account that spurious
wakeups happen on x86. A fix for this issue is available, but we just
revert to the .27 behaviour and let long running softirqs screw
themself.

Disable it for now.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2008-11-10 13:20:23 +01:00 • committed by Thomas Gleixner
parent ee5f80a993
commit ae99286b4f
1 changed files with 4 additions and 0 deletions
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4
kernel/time/tick-sched.c
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@ -568,6 +568,9 @@ static void tick_nohz_switch_to_nohz(void)
*/ */
static void tick_nohz_kick_tick(int cpu) static void tick_nohz_kick_tick(int cpu)
{ {
#if 0
/* Switch back to 2.6.27 behaviour */
struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu); struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
ktime_t delta, now; ktime_t delta, now;
@ -584,6 +587,7 @@ static void tick_nohz_kick_tick(int cpu)
return; return;
tick_nohz_restart(ts, now); tick_nohz_restart(ts, now);
#endif
} }
#else #else