perf tools: Add support for parsing PERF_SAMPLE_READ sample type

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>

diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index 1ebb8fb..6119a64 100644 (file)
--- 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 (file)
--- 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 (file)
--- 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 (file)
--- 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 (file)
--- 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 *