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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-09-18 14:14:01 -0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-09-18 14:47:30 -0400 |
| commit | def0a9b2573e00ab0b486cb5382625203ab4c4a6 (patch) | |
| tree | 1e3086fc320c244297b5b63cce47065bcfb71e8c /kernel/trace/trace_sched_switch.c | |
| 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>
Diffstat (limited to 'kernel/trace/trace_sched_switch.c')
0 files changed, 0 insertions, 0 deletions