diff options
| author | Andi Kleen <ak@suse.de> | 2008-01-30 13:30:02 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2008-04-17 12:22:31 +0200 |
| commit | 6993fc5bbc5d63ccd55985b39c34417e430e75e9 (patch) | |
| tree | 6a1ea13d3f27a8063a9375689b729479c4e63e22 /kernel/time/clocksource.c | |
| parent | 3833eecc183ce052e9ac96b39b45121a2d11ac16 (diff) | |
| download | linux-6993fc5bbc5d63ccd55985b39c34417e430e75e9.tar.gz linux-6993fc5bbc5d63ccd55985b39c34417e430e75e9.tar.bz2 linux-6993fc5bbc5d63ccd55985b39c34417e430e75e9.zip | |
clocksource: make clocksource watchdog cycle through online CPUs
This way it checks if the clocks are synchronized between CPUs too.
This might be able to detect slowly drifting TSCs which only
go wrong over longer time.
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/time/clocksource.c')
| -rw-r--r-- | kernel/time/clocksource.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c index 7f60097d443a..912156dd6005 100644 --- a/kernel/time/clocksource.c +++ b/kernel/time/clocksource.c @@ -141,8 +141,16 @@ static void clocksource_watchdog(unsigned long data) } if (!list_empty(&watchdog_list)) { - __mod_timer(&watchdog_timer, - watchdog_timer.expires + WATCHDOG_INTERVAL); + /* + * Cycle through CPUs to check if the CPUs stay + * synchronized to each other. + */ + int next_cpu = next_cpu(raw_smp_processor_id(), cpu_online_map); + + if (next_cpu >= NR_CPUS) + next_cpu = first_cpu(cpu_online_map); + watchdog_timer.expires += WATCHDOG_INTERVAL; + add_timer_on(&watchdog_timer, next_cpu); } spin_unlock(&watchdog_lock); } @@ -164,7 +172,8 @@ static void clocksource_check_watchdog(struct clocksource *cs) if (!started && watchdog) { watchdog_last = watchdog->read(); watchdog_timer.expires = jiffies + WATCHDOG_INTERVAL; - add_timer(&watchdog_timer); + add_timer_on(&watchdog_timer, + first_cpu(cpu_online_map)); } } else { if (cs->flags & CLOCK_SOURCE_IS_CONTINUOUS) @@ -185,7 +194,8 @@ static void clocksource_check_watchdog(struct clocksource *cs) watchdog_last = watchdog->read(); watchdog_timer.expires = jiffies + WATCHDOG_INTERVAL; - add_timer(&watchdog_timer); + add_timer_on(&watchdog_timer, + first_cpu(cpu_online_map)); } } } |