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Subject[PATCH 04/47] perf tools: Add support for parsing PERF_SAMPLE_READ sample type
Date
From: Jiri Olsa <jolsa@redhat.com>

Adding support to parse out the PERF_SAMPLE_READ sample bits. The code
contains both single and group format specification.

This code parse out and prepare PERF_SAMPLE_READ data into the
perf_sample struct. It will be used for group leader sampling feature
comming in shortly.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-0tgdoln5rwk3wocshb442cl3@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/event.h | 18 ++++++++++++++++++
tools/perf/util/evlist.c | 26 ++++++++++++++++++++++++++
tools/perf/util/evlist.h | 2 ++
tools/perf/util/evsel.c | 30 ++++++++++++++++++++++++++++--
tools/perf/util/session.c | 38 ++++++++++++++++++++++++++++++++++++++
5 files changed, 112 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index 1ebb8fb..6119a64 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -80,6 +80,23 @@ struct stack_dump {
char *data;
};

+struct sample_read_value {
+ u64 value;
+ u64 id;
+};
+
+struct sample_read {
+ u64 time_enabled;
+ u64 time_running;
+ union {
+ struct {
+ u64 nr;
+ struct sample_read_value *values;
+ } group;
+ struct sample_read_value one;
+ };
+};
+
struct perf_sample {
u64 ip;
u32 pid, tid;
@@ -97,6 +114,7 @@ struct perf_sample {
struct branch_stack *branch_stack;
struct regs_dump user_regs;
struct stack_dump user_stack;
+ struct sample_read read;
};

#define PERF_MEM_DATA_SRC_NONE \
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 0d3b739..df77a44 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -676,6 +676,32 @@ u64 perf_evlist__sample_type(struct perf_evlist *evlist)
return first->attr.sample_type;
}

+bool perf_evlist__valid_read_format(struct perf_evlist *evlist)
+{
+ struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
+ u64 read_format = first->attr.read_format;
+ u64 sample_type = first->attr.sample_type;
+
+ list_for_each_entry_continue(pos, &evlist->entries, node) {
+ if (read_format != pos->attr.read_format)
+ return false;
+ }
+
+ /* PERF_SAMPLE_READ imples PERF_FORMAT_ID. */
+ if ((sample_type & PERF_SAMPLE_READ) &&
+ !(read_format & PERF_FORMAT_ID)) {
+ return false;
+ }
+
+ return true;
+}
+
+u64 perf_evlist__read_format(struct perf_evlist *evlist)
+{
+ struct perf_evsel *first = perf_evlist__first(evlist);
+ return first->attr.read_format;
+}
+
u16 perf_evlist__id_hdr_size(struct perf_evlist *evlist)
{
struct perf_evsel *first = perf_evlist__first(evlist);
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 0583d36..c7178b7 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -118,6 +118,7 @@ int perf_evlist__apply_filters(struct perf_evlist *evlist);
void __perf_evlist__set_leader(struct list_head *list);
void perf_evlist__set_leader(struct perf_evlist *evlist);

+u64 perf_evlist__read_format(struct perf_evlist *evlist);
u64 perf_evlist__sample_type(struct perf_evlist *evlist);
bool perf_evlist__sample_id_all(struct perf_evlist *evlist);
u16 perf_evlist__id_hdr_size(struct perf_evlist *evlist);
@@ -127,6 +128,7 @@ int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *even

bool perf_evlist__valid_sample_type(struct perf_evlist *evlist);
bool perf_evlist__valid_sample_id_all(struct perf_evlist *evlist);
+bool perf_evlist__valid_read_format(struct perf_evlist *evlist);

void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
struct list_head *list,
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 8bed0c1..9ab8fff 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1096,8 +1096,34 @@ int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
}

if (type & PERF_SAMPLE_READ) {
- fprintf(stderr, "PERF_SAMPLE_READ is unsupported for now\n");
- return -1;
+ u64 read_format = evsel->attr.read_format;
+
+ if (read_format & PERF_FORMAT_GROUP)
+ data->read.group.nr = *array;
+ else
+ data->read.one.value = *array;
+
+ array++;
+
+ if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
+ data->read.time_enabled = *array;
+ array++;
+ }
+
+ if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
+ data->read.time_running = *array;
+ array++;
+ }
+
+ /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
+ if (read_format & PERF_FORMAT_GROUP) {
+ data->read.group.values = (struct sample_read_value *) array;
+ array = (void *) array + data->read.group.nr *
+ sizeof(struct sample_read_value);
+ } else {
+ data->read.one.id = *array;
+ array++;
+ }
}

if (type & PERF_SAMPLE_CALLCHAIN) {
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 272c9cf..f082921 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -71,6 +71,11 @@ static int perf_session__open(struct perf_session *self, bool force)
goto out_close;
}

+ if (!perf_evlist__valid_read_format(self->evlist)) {
+ pr_err("non matching read_format");
+ goto out_close;
+ }
+
self->size = input_stat.st_size;
return 0;

@@ -749,6 +754,36 @@ static void perf_session__print_tstamp(struct perf_session *session,
printf("%" PRIu64 " ", sample->time);
}

+static void sample_read__printf(struct perf_sample *sample, u64 read_format)
+{
+ printf("... sample_read:\n");
+
+ if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
+ printf("...... time enabled %016" PRIx64 "\n",
+ sample->read.time_enabled);
+
+ if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
+ printf("...... time running %016" PRIx64 "\n",
+ sample->read.time_running);
+
+ if (read_format & PERF_FORMAT_GROUP) {
+ u64 i;
+
+ printf(".... group nr %" PRIu64 "\n", sample->read.group.nr);
+
+ for (i = 0; i < sample->read.group.nr; i++) {
+ struct sample_read_value *value;
+
+ value = &sample->read.group.values[i];
+ printf("..... id %016" PRIx64
+ ", value %016" PRIx64 "\n",
+ value->id, value->value);
+ }
+ } else
+ printf("..... id %016" PRIx64 ", value %016" PRIx64 "\n",
+ sample->read.one.id, sample->read.one.value);
+}
+
static void dump_event(struct perf_session *session, union perf_event *event,
u64 file_offset, struct perf_sample *sample)
{
@@ -798,6 +833,9 @@ static void dump_sample(struct perf_evsel *evsel, union perf_event *event,

if (sample_type & PERF_SAMPLE_DATA_SRC)
printf(" . data_src: 0x%"PRIx64"\n", sample->data_src);
+
+ if (sample_type & PERF_SAMPLE_READ)
+ sample_read__printf(sample, evsel->attr.read_format);
}

static struct machine *
--
1.8.1.4


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