perf_counter: theres more to overflow than writing events

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Prepare for more generic overflow handling. The new perf_counter_overflow()
method will handle the generic bits of the counter overflow, and can return
a !0 return value, in which case the counter should be (soft) disabled, so
that it won't count until it's properly disabled.

XXX: do powerpc and swcounter

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: <20090406094517.812109629@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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This commit is contained in:

Peter Zijlstra 2009-04-06 11:45:04 +02:00 • committed by Ingo Molnar

parent b6276f353b

commit f6c7d5fe58

4 changed files with 28 additions and 10 deletions

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2

arch/powerpc/kernel/perf_counter.c

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3

arch/x86/kernel/cpu/perf_counter.c

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4

include/linux/perf_counter.h

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29

kernel/perf_counter.c

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