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| author | Miao Xie <miaox@cn.fujitsu.com> | 2008-08-20 16:37:38 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-08-21 09:54:06 +0200 |
| commit | 3c4fbe5e01d7e5309be5045e7ae0db20a049e6dc (patch) | |
| tree | 550195cb1a2ed58bc343e9a4f54d773e8abd5f90 | |
| parent | 6a55617ed5d1aa62b850de2cf66f5ede2eef4825 (diff) | |
| download | op-kernel-dev-3c4fbe5e01d7e5309be5045e7ae0db20a049e6dc.zip op-kernel-dev-3c4fbe5e01d7e5309be5045e7ae0db20a049e6dc.tar.gz | |
nohz: fix wrong event handler after online an offlined cpu
On the tickless system(CONFIG_NO_HZ=y and CONFIG_HIGH_RES_TIMERS=n), after
I made an offlined cpu online, I found this cpu's event handler was
tick_handle_periodic, not tick_nohz_handler.
After debuging, I found this bug was caused by the wrong tick mode. the
tick mode is not changed to NOHZ_MODE_INACTIVE when the cpu is offline.
This patch fixes this bug.
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | include/linux/tick.h | 5 | ||||
| -rw-r--r-- | kernel/time/tick-sched.c | 6 |
2 files changed, 9 insertions, 2 deletions
diff --git a/include/linux/tick.h b/include/linux/tick.h index d3c0269..8cf8cfe 100644 --- a/include/linux/tick.h +++ b/include/linux/tick.h @@ -74,10 +74,13 @@ extern struct tick_device *tick_get_device(int cpu); extern int tick_init_highres(void); extern int tick_program_event(ktime_t expires, int force); extern void tick_setup_sched_timer(void); +# endif + +# if defined CONFIG_NO_HZ || defined CONFIG_HIGH_RES_TIMERS extern void tick_cancel_sched_timer(int cpu); # else static inline void tick_cancel_sched_timer(int cpu) { } -# endif /* HIGHRES */ +# endif # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST extern struct tick_device *tick_get_broadcast_device(void); diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index f5da526..7a46bde 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -643,17 +643,21 @@ void tick_setup_sched_timer(void) ts->nohz_mode = NOHZ_MODE_HIGHRES; #endif } +#endif /* HIGH_RES_TIMERS */ +#if defined CONFIG_NO_HZ || defined CONFIG_HIGH_RES_TIMERS void tick_cancel_sched_timer(int cpu) { struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu); +# ifdef CONFIG_HIGH_RES_TIMERS if (ts->sched_timer.base) hrtimer_cancel(&ts->sched_timer); +# endif ts->nohz_mode = NOHZ_MODE_INACTIVE; } -#endif /* HIGH_RES_TIMERS */ +#endif /** * Async notification about clocksource changes |
