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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2008-06-27 13:41:15 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-06-27 14:31:30 +0200 |
| commit | 76a2a6ee8a0660a29127f05989ac59ae1ce865fa (patch) | |
| tree | 93ae1dd3cc5f564fc1e9d30bcdb0cd313f67221a /kernel/sched_clock.c | |
| parent | c09595f63bb1909c5dc4dca288f4fe818561b5f3 (diff) | |
| download | linux-76a2a6ee8a0660a29127f05989ac59ae1ce865fa.tar.bz2 | |
sched: sched_clock_cpu() based cpu_clock()
with sched_clock_cpu() being reasonably in sync between cpus (max 1 jiffy
difference) use this to provide cpu_clock().
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Cc: Mike Galbraith <efault@gmx.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched_clock.c')
| -rw-r--r-- | kernel/sched_clock.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/kernel/sched_clock.c b/kernel/sched_clock.c index ce05271219ab..3c696db59452 100644 --- a/kernel/sched_clock.c +++ b/kernel/sched_clock.c @@ -244,3 +244,15 @@ unsigned long long __attribute__((weak)) sched_clock(void) { return (unsigned long long)jiffies * (NSEC_PER_SEC / HZ); } + +unsigned long long cpu_clock(int cpu) +{ + unsigned long long clock; + unsigned long flags; + + raw_local_irq_save(flags); + clock = sched_clock_cpu(cpu); + raw_local_irq_restore(flags); + + return clock; +} |