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| author | Ingo Molnar <mingo@elte.hu> | 2007-10-17 10:26:06 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-17 19:42:46 +0400 |
| commit | a3b13c23f186ecb57204580cc1f2dbe9c284953a (patch) | |
| tree | 7f7b1de1c0c7e45b6dfc91b1d09639aaf1051291 /kernel/softlockup.c | |
| parent | 3806204ca9017a2cf2d849430f26e2b62666f5b2 (diff) | |
| download | linux-a3b13c23f186ecb57204580cc1f2dbe9c284953a.tar.xz | |
softlockup: use cpu_clock() instead of sched_clock()
sched_clock() is not a reliable time-source, use cpu_clock() instead.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/softlockup.c')
| -rw-r--r-- | kernel/softlockup.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/kernel/softlockup.c b/kernel/softlockup.c index 708d4882c0c3..68f7606b4160 100644 --- a/kernel/softlockup.c +++ b/kernel/softlockup.c @@ -40,14 +40,16 @@ static struct notifier_block panic_block = { * resolution, and we don't need to waste time with a big divide when * 2^30ns == 1.074s. */ -static unsigned long get_timestamp(void) +static unsigned long get_timestamp(int this_cpu) { - return sched_clock() >> 30; /* 2^30 ~= 10^9 */ + return cpu_clock(this_cpu) >> 30; /* 2^30 ~= 10^9 */ } void touch_softlockup_watchdog(void) { - __raw_get_cpu_var(touch_timestamp) = get_timestamp(); + int this_cpu = raw_smp_processor_id(); + + __raw_get_cpu_var(touch_timestamp) = get_timestamp(this_cpu); } EXPORT_SYMBOL(touch_softlockup_watchdog); @@ -91,7 +93,7 @@ void softlockup_tick(void) return; } - now = get_timestamp(); + now = get_timestamp(this_cpu); /* Wake up the high-prio watchdog task every second: */ if (now > (touch_timestamp + 1)) |