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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-07-21 13:19:40 +0200
committerPeter Zijlstra <a.p.zijlstra@chello.nl>2009-07-22 18:05:56 +0200
commit7f453c24b95a085fc7bd35d53b33abc4dc5a048b (patch)
tree63d2b80acb3095a3e1a56c69d20a8137a1337aed /tools
parent573402db02746179b3f95f83a11a787501f52d0a (diff)
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perf_counter: PERF_SAMPLE_ID and inherited counters
Anton noted that for inherited counters the counter-id as provided by PERF_SAMPLE_ID isn't mappable to the id found through PERF_RECORD_ID because each inherited counter gets its own id. His suggestion was to always return the parent counter id, since that is the primary counter id as exposed. However, these inherited counters have a unique identifier so that events like PERF_EVENT_PERIOD and PERF_EVENT_THROTTLE can be specific about which counter gets modified, which is important when trying to normalize the sample streams. This patch removes PERF_EVENT_PERIOD in favour of PERF_SAMPLE_PERIOD, which is more useful anyway, since changing periods became a lot more common than initially thought -- rendering PERF_EVENT_PERIOD the less useful solution (also, PERF_SAMPLE_PERIOD reports the more accurate value, since it reports the value used to trigger the overflow, whereas PERF_EVENT_PERIOD simply reports the requested period changed, which might only take effect on the next cycle). This still leaves us PERF_EVENT_THROTTLE to consider, but since that _should_ be a rare occurrence, and linking it to a primary id is the most useful bit to diagnose the problem, we introduce a PERF_SAMPLE_STREAM_ID, for those few cases where the full reconstruction is important. [Does change the ABI a little, but I see no other way out] Suggested-by: Anton Blanchard <anton@samba.org> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1248095846.15751.8781.camel@twins>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/builtin-annotate.c24
-rw-r--r--tools/perf/builtin-report.c24
2 files changed, 0 insertions, 48 deletions
diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
index 5f9eefecc57..1dba568e194 100644
--- a/tools/perf/builtin-annotate.c
+++ b/tools/perf/builtin-annotate.c
@@ -74,20 +74,12 @@ struct fork_event {
u32 pid, ppid;
};
-struct period_event {
- struct perf_event_header header;
- u64 time;
- u64 id;
- u64 sample_period;
-};
-
typedef union event_union {
struct perf_event_header header;
struct ip_event ip;
struct mmap_event mmap;
struct comm_event comm;
struct fork_event fork;
- struct period_event period;
} event_t;
@@ -998,19 +990,6 @@ process_fork_event(event_t *event, unsigned long offset, unsigned long head)
}
static int
-process_period_event(event_t *event, unsigned long offset, unsigned long head)
-{
- dprintf("%p [%p]: PERF_EVENT_PERIOD: time:%Ld, id:%Ld: period:%Ld\n",
- (void *)(offset + head),
- (void *)(long)(event->header.size),
- event->period.time,
- event->period.id,
- event->period.sample_period);
-
- return 0;
-}
-
-static int
process_event(event_t *event, unsigned long offset, unsigned long head)
{
switch (event->header.type) {
@@ -1025,9 +1004,6 @@ process_event(event_t *event, unsigned long offset, unsigned long head)
case PERF_EVENT_FORK:
return process_fork_event(event, offset, head);
-
- case PERF_EVENT_PERIOD:
- return process_period_event(event, offset, head);
/*
* We dont process them right now but they are fine:
*/
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index a118bc77286..b20a4b6e31b 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -101,13 +101,6 @@ struct fork_event {
u32 pid, ppid;
};
-struct period_event {
- struct perf_event_header header;
- u64 time;
- u64 id;
- u64 sample_period;
-};
-
struct lost_event {
struct perf_event_header header;
u64 id;
@@ -127,7 +120,6 @@ typedef union event_union {
struct mmap_event mmap;
struct comm_event comm;
struct fork_event fork;
- struct period_event period;
struct lost_event lost;
struct read_event read;
} event_t;
@@ -1636,19 +1628,6 @@ process_fork_event(event_t *event, unsigned long offset, unsigned long head)
}
static int
-process_period_event(event_t *event, unsigned long offset, unsigned long head)
-{
- dprintf("%p [%p]: PERF_EVENT_PERIOD: time:%Ld, id:%Ld: period:%Ld\n",
- (void *)(offset + head),
- (void *)(long)(event->header.size),
- event->period.time,
- event->period.id,
- event->period.sample_period);
-
- return 0;
-}
-
-static int
process_lost_event(event_t *event, unsigned long offset, unsigned long head)
{
dprintf("%p [%p]: PERF_EVENT_LOST: id:%Ld: lost:%Ld\n",
@@ -1729,9 +1708,6 @@ process_event(event_t *event, unsigned long offset, unsigned long head)
case PERF_EVENT_FORK:
return process_fork_event(event, offset, head);
- case PERF_EVENT_PERIOD:
- return process_period_event(event, offset, head);
-
case PERF_EVENT_LOST:
return process_lost_event(event, offset, head);