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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>
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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4
include/linux/perf_counter.h
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@ -491,8 +491,8 @@ extern int hw_perf_group_sched_in(struct perf_counter *group_leader,
struct perf_counter_context *ctx, int cpu);
extern void perf_counter_update_userpage(struct perf_counter *counter);
extern void perf_counter_output(struct perf_counter *counter,
int nmi, struct pt_regs *regs);
extern int perf_counter_overflow(struct perf_counter *counter,
int nmi, struct pt_regs *regs);
/*
* Return 1 for a software counter, 0 for a hardware counter
*/