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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-06-23 20:13:11 +0200
committerIngo Molnar <mingo@elte.hu>2009-06-25 21:39:07 +0200
commit38b200d67636a30cb8dc1508137908e7a649b5c9 (patch)
tree74f88d57a7f55075d4cd0b46690ff4b319dca642 /include
parent194002b274e9169a04beb1b23dcc132159bb566c (diff)
perf_counter: Add PERF_EVENT_READ
Provide a read() like event which can be used to log the counter value at specific sites such as child->parent folding on exit. In order to be useful, we log the counter parent ID, not the actual counter ID, since userspace can only relate parent IDs to perf_counter_attr constructs. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include')
-rw-r--r--include/linux/perf_counter.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index bcbf1c43ed4..6a384f04755 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -335,6 +335,18 @@ enum perf_event_type {
PERF_EVENT_FORK = 7,
/*
+ * struct {
+ * struct perf_event_header header;
+ * u32 pid, tid;
+ * u64 value;
+ * { u64 time_enabled; } && PERF_FORMAT_ENABLED
+ * { u64 time_running; } && PERF_FORMAT_RUNNING
+ * { u64 parent_id; } && PERF_FORMAT_ID
+ * };
+ */
+ PERF_EVENT_READ = 8,
+
+ /*
* When header.misc & PERF_EVENT_MISC_OVERFLOW the event_type field
* will be PERF_SAMPLE_*
*