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| author | Thomas Gleixner <tglx@linutronix.de> | 2008-11-10 13:20:23 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@apollo.(none)> | 2008-11-10 22:39:27 +0100 |
| commit | ae99286b4f1be7788f2d6947c66a91dbd6351eec (patch) | |
| tree | a403ffaeaad1cb38afa79e2cca40ecc00ea694ab /kernel | |
| parent | ee5f80a993539490a07477ff2526bf62c503fbb4 (diff) | |
| download | lwn-ae99286b4f1be7788f2d6947c66a91dbd6351eec.tar.gz lwn-ae99286b4f1be7788f2d6947c66a91dbd6351eec.zip | |
nohz: disable tick_nohz_kick_tick() for now
Impact: nohz powersavings and wakeup regression
commit fb02fbc14d17837b4b7b02dbb36142c16a7bf208 (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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/time/tick-sched.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 5bbb1044f847..342fc9ccab46 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -568,6 +568,9 @@ static void tick_nohz_switch_to_nohz(void) */ 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); ktime_t delta, now; @@ -584,6 +587,7 @@ static void tick_nohz_kick_tick(int cpu) return; tick_nohz_restart(ts, now); +#endif } #else |