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(parent: 339f7c9) | patch
perf_counter: counter overflow limit
authorPeter Zijlstra <a.p.zijlstra@chello.nl>
Mon, 6 Apr 2009 09:45:07 +0000 (11:45 +0200)
committerIngo Molnar <mingo@elte.hu>
Tue, 7 Apr 2009 08:48:58 +0000 (10:48 +0200)
commit79f146415623fe74f39af67c0f6adc208939a410
tree2b8b3ac045b21cce1169b55bd298a93dba4a19b3tree | snapshot (tar.gz zip)
parent339f7c90b8a2f3aa2dd4267e79f797999e8a3c59commit | diff
perf_counter: counter overflow limit

Provide means to auto-disable the counter after 'n' overflow events.

Create the counter with hw_event.disabled = 1, and then issue an
ioctl(fd, PREF_COUNTER_IOC_REFRESH, n); to set the limit and enable
the counter.

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: <20090406094518.083139737@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
include/linux/perf_counter.h diff | blob | blame | history
kernel/perf_counter.c diff | blob | blame | history