perf tools: Add ability to synthesize event according to a sample

It's the counterpart of perf_session__parse_sample.

v2: fixed mistakes found by David Ahern.
v3: s/data/sample/
    s/perf_event__change_sample/perf_event__synthesize_sample

Reviewed-by: David Ahern <dsahern@gmail.com>
Cc: Arun Sharma <asharma@fb.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: devel@openvz.org
Link: http://lkml.kernel.org/r/1323266161-394927-3-git-send-email-avagin@openvz.org
Signed-off-by: Andrew Vagin <avagin@openvz.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index 0d80201ce8441d82fa4a44a959b00ee717819337..cbdeaad9c5e5c3f01b749d7c515eb16a99320612 100644 (file)
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -199,6 +199,9 @@ 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 ee68d6944e61883ca62660b1071e30ff3e4ddd06..4a8c8b02e9cc4961298477eb4dab10e35f0db16c 100644 (file)
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -574,3 +574,82 @@ 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) {
+                       /*
+                        * Inverse of what is done in perf_event__parse_sample
+                        */
+                       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) {
+                       /*
+                        * Inverse of what is done in perf_event__parse_sample
+                        */
+                       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 30e9c6b6fc3c1809debc107f54356c7ec8b8038b..fb696124ad61a32407127ddb874771ed7b95a1f0 100644 (file)
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -134,6 +134,14 @@ 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);