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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-05-25 17:39:05 +0200
committerIngo Molnar <mingo@elte.hu>2009-05-25 21:41:12 +0200
commita78ac3258782f3e64cb40beb5990808e1febcc0c (patch)
tree692462a974e4c26bdb7fa7fae727a6b326a0eeee /include
parent48e22d56ecdeddd1ffb42a02fccba5c6ef42b133 (diff)
downloadlinux-a78ac3258782f3e64cb40beb5990808e1febcc0c.tar.gz
perf_counter: Generic per counter interrupt throttle
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>
Diffstat (limited to 'include')
-rw-r--r--include/linux/perf_counter.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index 0c160be2078f..e3a7585d3e43 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -267,6 +267,15 @@ 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);