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Subject[PATCH V6 10/12] perf tools: add support for PERF_SAMPLE_IDENTFIER
Date
Enable parsing of samples with sample format bit
PERF_SAMPLE_IDENTFIER. In addition, if the kernel supports
it, prefer it to selecting PERF_SAMPLE_ID thereby avoiding
the need to force compatible sample types.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
tools/perf/tests/mmap-basic.c | 2 +-
tools/perf/util/event.h | 9 +++--
tools/perf/util/evlist.c | 94 +++++++++++++++++++++++++++++++++++++++++--
tools/perf/util/evlist.h | 1 +
tools/perf/util/evsel.c | 41 +++++++++++++++----
tools/perf/util/evsel.h | 3 +-
6 files changed, 134 insertions(+), 16 deletions(-)

diff --git a/tools/perf/tests/mmap-basic.c b/tools/perf/tests/mmap-basic.c
index 5b1b5ab..c4185b9 100644
--- a/tools/perf/tests/mmap-basic.c
+++ b/tools/perf/tests/mmap-basic.c
@@ -72,7 +72,7 @@ int test__basic_mmap(void)
}

evsels[i]->attr.wakeup_events = 1;
- perf_evsel__set_sample_id(evsels[i]);
+ perf_evsel__set_sample_id(evsels[i], false);

perf_evlist__add(evlist, evsels[i]);

diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index 94f4503..82bad0d 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -53,7 +53,8 @@ struct read_event {
(PERF_SAMPLE_IP | PERF_SAMPLE_TID | \
PERF_SAMPLE_TIME | PERF_SAMPLE_ADDR | \
PERF_SAMPLE_ID | PERF_SAMPLE_STREAM_ID | \
- PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD)
+ PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD | \
+ PERF_SAMPLE_IDENTIFIER)

/*
* Events have compatible sample types if the following bits all have the same
@@ -61,13 +62,15 @@ struct read_event {
* events the order is: PERF_SAMPLE_IP, PERF_SAMPLE_TID, PERF_SAMPLE_TIME,
* PERF_SAMPLE_ADDR, PERF_SAMPLE_ID. For non-sample events the sample members
* are accessed in reverse order. The order is: PERF_SAMPLE_ID,
- * PERF_SAMPLE_STREAM_ID, PERF_SAMPLE_CPU.
+ * PERF_SAMPLE_STREAM_ID, PERF_SAMPLE_CPU. PERF_SAMPLE_IDENTIFIER is added for
+ * completeness but it should not be used with PERF_SAMPLE_ID. Sample types
+ * that include PERF_SAMPLE_IDENTIFIER are always compatible.
*/
#define PERF_COMPAT_MASK \
(PERF_SAMPLE_IP | PERF_SAMPLE_TID | \
PERF_SAMPLE_TIME | PERF_SAMPLE_ADDR | \
PERF_SAMPLE_ID | PERF_SAMPLE_STREAM_ID | \
- PERF_SAMPLE_CPU)
+ PERF_SAMPLE_CPU | PERF_SAMPLE_IDENTIFIER)

struct sample_event {
struct perf_event_header header;
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index b8a5a75..3c53ef0 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -89,10 +89,81 @@ void perf_evlist__make_sample_types_compatible(struct perf_evlist *evlist)
perf_evlist__set_id_pos(evlist);
}

+typedef void (*setup_probe_fn_t)(struct perf_evsel *evsel);
+
+static int perf_do_probe_api(setup_probe_fn_t fn, int cpu, const char *str)
+{
+ struct perf_evlist *evlist;
+ struct perf_evsel *evsel;
+ int err = -EAGAIN, fd;
+
+ evlist = perf_evlist__new();
+ if (!evlist)
+ return -ENOMEM;
+
+ if (parse_events(evlist, str))
+ goto out_delete;
+
+ evsel = perf_evlist__first(evlist);
+
+ fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, 0);
+ if (fd < 0)
+ goto out_delete;
+ close(fd);
+
+ fn(evsel);
+
+ fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, 0);
+ if (fd < 0) {
+ if (errno == EINVAL)
+ err = -EINVAL;
+ goto out_delete;
+ }
+ close(fd);
+ err = 0;
+
+out_delete:
+ perf_evlist__delete(evlist);
+ return err;
+}
+
+static bool perf_probe_api(setup_probe_fn_t fn)
+{
+ const char *try[] = {"cycles:u", "instructions:u", "cpu-clock", NULL};
+ struct cpu_map *cpus;
+ int cpu, ret, i = 0;
+
+ cpus = cpu_map__new(NULL);
+ if (!cpus)
+ return false;
+ cpu = cpus->map[0];
+ cpu_map__delete(cpus);
+
+ do {
+ ret = perf_do_probe_api(fn, cpu, try[i++]);
+ if (!ret)
+ return true;
+ } while (ret == -EAGAIN && try[i]);
+
+ return false;
+}
+
+static void perf_probe_sample_identifier(struct perf_evsel *evsel)
+{
+ evsel->attr.sample_type |= PERF_SAMPLE_IDENTIFIER;
+}
+
+bool perf_can_sample_identifier(void)
+{
+ return perf_probe_api(perf_probe_sample_identifier);
+}
+
void perf_evlist__config(struct perf_evlist *evlist,
struct perf_record_opts *opts)
{
struct perf_evsel *evsel;
+ bool use_sample_identifier = false;
+
/*
* Set the evsel leader links before we configure attributes,
* since some might depend on this info.
@@ -103,14 +174,26 @@ void perf_evlist__config(struct perf_evlist *evlist,
if (evlist->cpus->map[0] < 0)
opts->no_inherit = true;

- list_for_each_entry(evsel, &evlist->entries, node) {
+ list_for_each_entry(evsel, &evlist->entries, node)
perf_evsel__config(evsel, opts);

- if (evlist->nr_entries > 1)
- perf_evsel__set_sample_id(evsel);
+ if (evlist->nr_entries > 1) {
+ struct perf_evsel *first = perf_evlist__first(evlist);
+
+ list_for_each_entry(evsel, &evlist->entries, node) {
+ if (evsel->attr.sample_type == first->attr.sample_type)
+ continue;
+ use_sample_identifier = perf_can_sample_identifier();
+ break;
+ }
+ list_for_each_entry(evsel, &evlist->entries, node)
+ perf_evsel__set_sample_id(evsel, use_sample_identifier);
}

- perf_evlist__make_sample_types_compatible(evlist);
+ if (use_sample_identifier)
+ perf_evlist__set_id_pos(evlist);
+ else
+ perf_evlist__make_sample_types_compatible(evlist);
}

static void perf_evlist__purge(struct perf_evlist *evlist)
@@ -814,6 +897,9 @@ u16 perf_evlist__id_hdr_size(struct perf_evlist *evlist)

if (sample_type & PERF_SAMPLE_CPU)
size += sizeof(data->cpu) * 2;
+
+ if (sample_type & PERF_SAMPLE_IDENTIFIER)
+ size += sizeof(data->id);
out:
return size;
}
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index b1be475..9b767e6 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -88,6 +88,7 @@ int perf_evlist__open(struct perf_evlist *evlist);
void perf_evlist__close(struct perf_evlist *evlist);

void perf_evlist__make_sample_types_compatible(struct perf_evlist *evlist);
+bool perf_can_sample_identifier(void);
void perf_evlist__config(struct perf_evlist *evlist,
struct perf_record_opts *opts);

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index f134c69..41cfb21 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -50,13 +50,17 @@ int __perf_evsel__sample_size(u64 sample_type)
* __perf_evsel__calc_id_pos - calculate id_pos.
* @sample_type: sample type
*
- * This function returns the position of the event id (PERF_SAMPLE_ID) in a
- * sample event i.e. in the array of struct sample_event.
+ * This function returns the position of the event id (PERF_SAMPLE_ID or
+ * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct
+ * sample_event.
*/
static int __perf_evsel__calc_id_pos(u64 sample_type)
{
int idx = 0;

+ if (sample_type & PERF_SAMPLE_IDENTIFIER)
+ return 0;
+
if (!(sample_type & PERF_SAMPLE_ID))
return -1;

@@ -80,13 +84,16 @@ static int __perf_evsel__calc_id_pos(u64 sample_type)
* @sample_type: sample type
*
* This function returns the position (counting backwards) of the event id
- * (PERF_SAMPLE_ID) in a non-sample event i.e. if sample_id_all is used there is
- * an id sample appended to non-sample events.
+ * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if
+ * sample_id_all is used there is an id sample appended to non-sample events.
*/
static int __perf_evsel__calc_is_pos(u64 sample_type)
{
int idx = 1;

+ if (sample_type & PERF_SAMPLE_IDENTIFIER)
+ return 1;
+
if (!(sample_type & PERF_SAMPLE_ID))
return -1;

@@ -135,9 +142,13 @@ void __perf_evsel__reset_sample_bit(struct perf_evsel *evsel,
}
}

-void perf_evsel__set_sample_id(struct perf_evsel *evsel)
+void perf_evsel__set_sample_id(struct perf_evsel *evsel,
+ bool can_sample_identifier)
{
- perf_evsel__set_sample_bit(evsel, ID);
+ if (can_sample_identifier)
+ perf_evsel__set_sample_bit(evsel, IDENTIFIER);
+ else
+ perf_evsel__set_sample_bit(evsel, ID);
evsel->attr.read_format |= PERF_FORMAT_ID;
}

@@ -1071,6 +1082,11 @@ static int perf_evsel__parse_id_sample(const struct perf_evsel *evsel,
array += ((event->header.size -
sizeof(event->header)) / sizeof(u64)) - 1;

+ if (type & PERF_SAMPLE_IDENTIFIER) {
+ sample->id = *array;
+ array--;
+ }
+
if (type & PERF_SAMPLE_CPU) {
u.val64 = *array;
if (swapped) {
@@ -1175,6 +1191,12 @@ int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
if (evsel->sample_size + sizeof(event->header) > event->header.size)
return -EFAULT;

+ data->id = -1ULL;
+ if (type & PERF_SAMPLE_IDENTIFIER) {
+ data->id = *array;
+ array++;
+ }
+
if (type & PERF_SAMPLE_IP) {
data->ip = *array;
array++;
@@ -1205,7 +1227,6 @@ int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
array++;
}

- data->id = -1ULL;
if (type & PERF_SAMPLE_ID) {
data->id = *array;
array++;
@@ -1349,6 +1370,11 @@ int perf_event__synthesize_sample(union perf_event *event, u64 type,

array = event->sample.array;

+ if (type & PERF_SAMPLE_IDENTIFIER) {
+ *array = sample->id;
+ array++;
+ }
+
if (type & PERF_SAMPLE_IP) {
*array = sample->ip;
array++;
@@ -1537,6 +1563,7 @@ static int sample_type__fprintf(FILE *fp, bool *first, u64 value)
bit_name(READ), bit_name(CALLCHAIN), bit_name(ID), bit_name(CPU),
bit_name(PERIOD), bit_name(STREAM_ID), bit_name(RAW),
bit_name(BRANCH_STACK), bit_name(REGS_USER), bit_name(STACK_USER),
+ bit_name(IDENTIFIER),
{ .name = NULL, }
};
#undef bit_name
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index c6d616c..bca8e5f 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -148,7 +148,8 @@ void __perf_evsel__reset_sample_bit(struct perf_evsel *evsel,
#define perf_evsel__reset_sample_bit(evsel, bit) \
__perf_evsel__reset_sample_bit(evsel, PERF_SAMPLE_##bit)

-void perf_evsel__set_sample_id(struct perf_evsel *evsel);
+void perf_evsel__set_sample_id(struct perf_evsel *evsel,
+ bool use_sample_identifier);

int perf_evsel__set_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
const char *filter);
--
1.7.11.7


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