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| author | Ingo Molnar <mingo@elte.hu> | 2009-05-15 08:25:22 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-05-15 09:47:05 +0200 |
| commit | 1c80f4b598d9b075a2a0be694e28be93a6702bcc (patch) | |
| tree | b48d59fecd365342d6c2c8aab7912de9cd7aa030 /arch/x86/video | |
| parent | a4016a79fcbd139e7378944c0d86a39fdbc70ecc (diff) | |
perf_counter: x86: Disallow interval of 1
On certain CPUs i have observed a stuck PMU if interval was set to
1 and NMIs were used. The PMU had PMC0 set in MSR_CORE_PERF_GLOBAL_STATUS,
but it was not possible to ack it via MSR_CORE_PERF_GLOBAL_OVF_CTRL,
and the NMI loop got stuck infinitely.
[ Impact: fix rare hangs during high perfcounter load ]
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/video')
0 files changed, 0 insertions, 0 deletions