From b2fef0762fdb65cf8702eea93f4e58abeb0ecefc Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@elte.hu>
Date: Fri, 5 Jun 2009 18:07:51 +0200
Subject: [PATCH] perf_counter tools: Sample and display frequency adjustment
changes
To allow the debugging of frequency-adjusting counters, sample
those adjustments and display them in perf report -D.
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
Documentation/perf_counter/builtin-record.c | 2 +-
Documentation/perf_counter/builtin-report.c | 39 +++++++++++++++++----
2 files changed, 34 insertions(+), 7 deletions(-)
diff --git a/Documentation/perf_counter/builtin-record.c b/Documentation/perf_counter/builtin-record.c
index d4ad3057a711..43ddab31ac39 100644
--- a/Documentation/perf_counter/builtin-record.c
+++ b/Documentation/perf_counter/builtin-record.c
@@ -347,7 +347,7 @@ static void create_counter(int counter, int cpu, pid_t pid)
memset(&attr, 0, sizeof(attr));
attr.config = event_id[counter];
attr.sample_period = event_count[counter];
- attr.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
+ attr.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID | PERF_SAMPLE_PERIOD;
attr.freq = freq;
attr.mmap = track;
attr.comm = track;
diff --git a/Documentation/perf_counter/builtin-report.c b/Documentation/perf_counter/builtin-report.c
index 5af105c280b5..242e09ff3658 100644
--- a/Documentation/perf_counter/builtin-report.c
+++ b/Documentation/perf_counter/builtin-report.c
@@ -69,12 +69,20 @@ struct fork_event {
__u32 pid, ppid;
};
-typedef union event_union {
+struct period_event {
struct perf_event_header header;
- struct ip_event ip;
- struct mmap_event mmap;
- struct comm_event comm;
- struct fork_event fork;
+ __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;
static LIST_HEAD(dsos);
@@ -1052,6 +1060,19 @@ process_fork_event(event_t *event, unsigned long offset, unsigned long head)
return 0;
}
+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)
{
@@ -1068,11 +1089,12 @@ 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:
*/
- case PERF_EVENT_PERIOD:
case PERF_EVENT_THROTTLE:
case PERF_EVENT_UNTHROTTLE:
return 0;
@@ -1157,6 +1179,11 @@ static int __cmd_report(void)
size = event->header.size;
+ dprintf("%p [%p]: event: %d\n",
+ (void *)(offset + head),
+ (void *)(long)event->header.size,
+ event->header.type);
+
if (!size || process_event(event, offset, head) < 0) {
dprintf("%p [%p]: skipping unknown header type: %d\n",
--
GitLab