| commit | def0a9b2573e00ab0b486cb5382625203ab4c4a6 | [log] [tgz] |
|---|---|---|
| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | Fri Sep 18 20:14:01 2009 +0200 |
| committer | Ingo Molnar <mingo@elte.hu> | Fri Sep 18 20:47:30 2009 +0200 |
| tree | 1e3086fc320c244297b5b63cce47065bcfb71e8c | |
| parent | cf450a7355a116af793998c118a6bcf7f5a8367e [diff] |
sched_clock: Make it NMI safe Arjan complained about the suckyness of TSC on modern machines, and asked if we could do something about that for PERF_SAMPLE_TIME. Make cpu_clock() NMI safe by removing the spinlock and using cmpxchg. This also makes it smaller and more robust. Affects architectures that use HAVE_UNSTABLE_SCHED_CLOCK, i.e. IA64 and x86. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>