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perf_counter: Generic per counter interrupt throttle

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Introduce a generic per counter interrupt throttle.

This uses the perf_counter_overflow() quick disable to throttle a specific
counter when its going too fast when a pmu->unthrottle() method is provided
which can undo the quick disable.

Power needs to implement both the quick disable and the unthrottle method.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
LKML-Reference: <20090525153931.703093461@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2009-05-25 17:39:05 +02:00
committed by Ingo Molnar
parent 48e22d56ec
commit a78ac32587
4 changed files with 87 additions and 4 deletions
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11
include/linux/perf_counter.h
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@@ -266,6 +266,15 @@ enum perf_event_type {
*/
PERF_EVENT_PERIOD = 4,
/*
* struct {
* struct perf_event_header header;
* u64 time;
* };
*/
PERF_EVENT_THROTTLE = 5,
PERF_EVENT_UNTHROTTLE = 6,
/*
* When header.misc & PERF_EVENT_MISC_OVERFLOW the event_type field
* will be PERF_RECORD_*
@@ -367,6 +376,7 @@ struct pmu {
int (*enable) (struct perf_counter *counter);
void (*disable) (struct perf_counter *counter);
void (*read) (struct perf_counter *counter);
void (*unthrottle) (struct perf_counter *counter);
};
/**
@@ -613,6 +623,7 @@ extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs);
extern int sysctl_perf_counter_priv;
extern int sysctl_perf_counter_mlock;
extern int sysctl_perf_counter_limit;
extern void perf_counter_init(void);