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perf_counter: comment the perf_event_type stuff 

Describe the event format.

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: <20090406094518.211174347@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-04-06 11:45:08 +02:00 committed by Ingo Molnar
parent 79f1464156
commit 0c593b3411
1 changed files with 32 additions and 0 deletions
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32
include/linux/perf_counter.h
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@ -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,