Commit-ID: 0c593b3411341e3a05a61f5527df36ab02bd11e8
Gitweb: http://git.kernel.org/tip/0c593b3411341e3a05a61f5527df36ab02bd11e8
Author: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
AuthorDate: Mon, 6 Apr 2009 11:45:08 +0200
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Tue, 7 Apr 2009 10:48:59 +0200
perf_counter: comment the perf_event_type stuff
Describe the event format.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Corey Ashford <cjashfor@xxxxxxxxxxxxxxxxxx>
LKML-Reference: <20090406094518.211174347@xxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
include/linux/perf_counter.h | 32 ++++++++++++++++++++++++++++++++
1 files changed, 32 insertions(+), 0 deletions(-)
diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index ef4dcbf..8122018 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -208,6 +208,20 @@ struct perf_event_header {
enum perf_event_type {
+ /*
+ * The MMAP events record the PROT_EXEC mappings so that we can
+ * correlate userspace IPs to code. They have the following structure:
+ *
+ * struct {
+ * struct perf_event_header header;
+ *
+ * u32 pid, tid;
+ * u64 addr;
+ * u64 len;
+ * u64 pgoff;
+ * char filename[];
+ * };
+ */
PERF_EVENT_MMAP = 1,
PERF_EVENT_MUNMAP = 2,
@@ -217,6 +231,24 @@ enum perf_event_type {
*
* These events will have types of the form:
* PERF_EVENT_COUNTER_OVERFLOW { | __PERF_EVENT_* } *
+ *
+ * struct {
+ * struct perf_event_header header;
+ *
+ * { u64 ip; } && __PERF_EVENT_IP
+ * { u32 pid, tid; } && __PERF_EVENT_TID
+ *
+ * { u64 nr;
+ * { u64 event, val; } cnt[nr]; } && __PERF_EVENT_GROUP
+ *
+ * { u16 nr,
+ * hv,
+ * kernel,
+ * user;
+ * u64 ips[nr]; } && __PERF_EVENT_CALLCHAIN
+ *
+ * { u64 time; } && __PERF_EVENT_TIME
+ * };
*/
PERF_EVENT_COUNTER_OVERFLOW = 1UL << 31,
__PERF_EVENT_IP = PERF_RECORD_IP,
--
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