OpenVZ Forum


Home » Mailing lists » Devel » [PATCH 2/6] perf: add ability to change event according to sample (v3)
[PATCH 2/6] perf: add ability to change event according to sample (v3) [message #44434] Wed, 07 December 2011 13:55
Andrey Vagin is currently offline  Andrey Vagin
Messages: 9
Registered: December 2011
Junior Member
From: *parallels.com
It's opposition of perf_session__parse_sample.

v2: fixed mistakes which David Arhen found
v3: s/data/sample/
s/perf_event__change_sample/perf_event__synthesize_sample

Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Andrew Vagin <avagin@openvz.org>
---
tools/perf/util/event.h | 2 +
tools/perf/util/evsel.c | 74 +++++++++++++++++++++++++++++++++++++++++++++
tools/perf/util/session.h | 9 +++++
3 files changed, 85 insertions(+), 0 deletions(-)

diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index 0d80201..cc3cc11 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -199,6 +199,8 @@ const char *perf_event__name(unsigned int id);
int perf_event__parse_sample(const union perf_event *event, u64 type,
int sample_size, bool sample_id_all,
struct perf_sample *sample, bool swapped);
+int perf_event__synthesize_sample(union perf_event *event, u64 type,
+ const struct perf_sample *sample, bool swapped);

size_t perf_event__fprintf_comm(union perf_event *event, FILE *fp);
size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp);
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index ee68d69..e2d1b22 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -574,3 +574,77 @@ int perf_event__parse_sample(const union perf_event *event, u64 type,

return 0;
}
+
+int perf_event__synthesize_sample(union perf_event *event, u64 type,
+ const struct perf_sample *sample, bool swapped)
+{
+ u64 *array;
+
+ /*
+ * used for cross-endian analysis. See git commit 65014ab3
+ * for why this goofiness is needed.
+ */
+ union {
+ u64 val64;
+ u32 val32[2];
+ } u;
+
+ array = event->sample.array;
+
+ if (type & PERF_SAMPLE_IP) {
+ event->ip.ip = sample->ip;
+ array++;
+ }
+
+ if (type & PERF_SAMPLE_TID) {
+ u.val32[0] = sample->pid;
+ u.val32[1] = sample->tid;
+ if (swapped) {
+ /* undo swap of u64, then swap on individual u32s */
+ u.val32[0] = bswap_32(u.val32[0]);
+ u.val32[1] = bswap_32(u.val32[1]);
+ u.val64 = bswap_64(u.val64);
+ }
+
+ *array = u.val64;
+ array++;
+ }
+
+ if (type & PERF_SAMPLE_TIME) {
+ *array = sample->time;
+ array++;
+ }
+
+ if (type & PERF_SAMPLE_ADDR) {
+ *array = sample->addr;
+ array++;
+ }
+
+ if (type & PERF_SAMPLE_ID) {
+ *array = sample->id;
+ array++;
+ }
+
+ if (type & PERF_SAMPLE_STREAM_ID) {
+ *array = sample->stream_id;
+ array++;
+ }
+
+ if (type & PERF_SAMPLE_CPU) {
+ u.val32[0] = sample->cpu;
+ if (swapped) {
+ /* undo swap of u64, then swap on individual u32s */
+ u.val32[0] = bswap_32(u.val32[0]);
+ u.val64 = bswap_64(u.val64);
+ }
+ *array = u.val64;
+ array++;
+ }
+
+ if (type & PERF_SAMPLE_PERIOD) {
+ *array = sample->period;
+ array++;
+ }
+
+ return 0;
+}
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index 30e9c6b..4ed73d3 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -134,6 +134,15 @@ static inline int perf_session__parse_sample(struct perf_session *session,
session->header.needs_swap);
}

+static inline int perf_session__synthesize_sample(struct perf_session *session,
+ union perf_event *event,
+ const struct perf_sample *sample)
+{
+ return perf_event__synthesize_sample(event, session->sample_type,
+ sample,
+ session->header.needs_swap);
+}
+
struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session,
unsigned int type);

--
1.7.1
Previous Topic: [PATCH 1/6] perf: use event_name() to get an event name
Next Topic: [PATCH 0/7] Profiling sleep times (v4)
Goto Forum:
  


Current Time: Mon Jun 18 13:06:10 GMT 2018