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-rw-r--r--tools/perf/Documentation/perf-stat.txt12
-rw-r--r--tools/perf/builtin-stat.c120
2 files changed, 128 insertions, 4 deletions
diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt
index 4e074a660826..70eee1c2c444 100644
--- a/tools/perf/Documentation/perf-stat.txt
+++ b/tools/perf/Documentation/perf-stat.txt
@@ -10,6 +10,7 @@ SYNOPSIS
[verse]
'perf stat' [-e <EVENT> | --event=EVENT] [-a] <command>
'perf stat' [-e <EVENT> | --event=EVENT] [-a] -- <command> [<options>]
+'perf stat' [-e <EVENT> | --event=EVENT] [-a] record [-o file] -- <command> [<options>]
DESCRIPTION
-----------
@@ -22,6 +23,8 @@ OPTIONS
<command>...::
Any command you can specify in a shell.
+record::
+ See STAT RECORD.
-e::
--event=::
@@ -159,6 +162,15 @@ filter out the startup phase of the program, which is often very different.
Print statistics of transactional execution if supported.
+STAT RECORD
+-----------
+Stores stat data into perf data file.
+
+-o file::
+--output file::
+Output file name.
+
+
EXAMPLES
--------
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index bbf42eefd5e5..af2a3bf659f7 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -59,6 +59,7 @@
#include "util/thread.h"
#include "util/thread_map.h"
#include "util/counts.h"
+#include "util/session.h"
#include <stdlib.h>
#include <sys/prctl.h>
@@ -126,6 +127,16 @@ static bool append_file;
static const char *output_name;
static int output_fd;
+struct perf_stat {
+ bool record;
+ struct perf_data_file file;
+ struct perf_session *session;
+ u64 bytes_written;
+};
+
+static struct perf_stat perf_stat;
+#define STAT_RECORD perf_stat.record
+
static volatile int done = 0;
static struct perf_stat_config stat_config = {
@@ -166,7 +177,11 @@ static int create_perf_stat_counter(struct perf_evsel *evsel)
* like tracepoints. Clear it up for counting.
*/
attr->sample_period = 0;
- attr->sample_type = 0;
+ /*
+ * But set sample_type to PERF_SAMPLE_IDENTIFIER, which should be harmless
+ * while avoiding that older tools show confusing messages.
+ */
+ attr->sample_type = PERF_SAMPLE_IDENTIFIER;
/*
* Disabling all counters initially, they will be enabled
@@ -202,6 +217,26 @@ static inline int nsec_counter(struct perf_evsel *evsel)
return 0;
}
+static int perf_stat__write(struct perf_stat *stat, void *bf, size_t size)
+{
+ if (perf_data_file__write(stat->session->file, bf, size) < 0) {
+ pr_err("failed to write perf data, error: %m\n");
+ return -1;
+ }
+
+ stat->bytes_written += size;
+ return 0;
+}
+
+static int process_synthesized_event(struct perf_tool *tool,
+ union perf_event *event,
+ struct perf_sample *sample __maybe_unused,
+ struct machine *machine __maybe_unused)
+{
+ struct perf_stat *stat = (void *)tool;
+ return perf_stat__write(stat, event, event->header.size);
+}
+
/*
* Read out the results of a single counter:
* do not aggregate counts across CPUs in system-wide mode
@@ -361,6 +396,15 @@ static int __run_perf_stat(int argc, const char **argv)
return -1;
}
+ if (STAT_RECORD) {
+ int err, fd = perf_data_file__fd(&perf_stat.file);
+
+ err = perf_session__write_header(perf_stat.session, evsel_list,
+ fd, false);
+ if (err < 0)
+ return err;
+ }
+
/*
* Enable counters and exec the command:
*/
@@ -1261,6 +1305,38 @@ static int add_default_attributes(void)
return perf_evlist__add_default_attrs(evsel_list, very_very_detailed_attrs);
}
+static const char * const recort_usage[] = {
+ "perf stat record [<options>]",
+ NULL,
+};
+
+static int __cmd_record(int argc, const char **argv)
+{
+ struct perf_session *session;
+ struct perf_data_file *file = &perf_stat.file;
+
+ argc = parse_options(argc, argv, stat_options, record_usage,
+ PARSE_OPT_STOP_AT_NON_OPTION);
+
+ if (output_name)
+ file->path = output_name;
+
+ session = perf_session__new(file, false, NULL);
+ if (session == NULL) {
+ pr_err("Perf session creation failed.\n");
+ return -1;
+ }
+
+ /* No pipe support ATM */
+ if (perf_stat.file.is_pipe)
+ return -EINVAL;
+
+ session->evlist = evsel_list;
+ perf_stat.session = session;
+ perf_stat.record = true;
+ return argc;
+}
+
int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
{
const char * const stat_usage[] = {
@@ -1271,6 +1347,7 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
const char *mode;
FILE *output = stderr;
unsigned int interval;
+ const char * const stat_subcommands[] = { "record" };
setlocale(LC_ALL, "");
@@ -1278,12 +1355,22 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
if (evsel_list == NULL)
return -ENOMEM;
- argc = parse_options(argc, argv, stat_options, stat_usage,
- PARSE_OPT_STOP_AT_NON_OPTION);
+ argc = parse_options_subcommand(argc, argv, stat_options, stat_subcommands,
+ (const char **) stat_usage,
+ PARSE_OPT_STOP_AT_NON_OPTION);
+
+ if (argc && !strncmp(argv[0], "rec", 3)) {
+ argc = __cmd_record(argc, argv);
+ if (argc < 0)
+ return -1;
+ }
interval = stat_config.interval;
- if (output_name && strcmp(output_name, "-"))
+ /*
+ * For record command the -o is already taken care of.
+ */
+ if (!STAT_RECORD && output_name && strcmp(output_name, "-"))
output = NULL;
if (output_name && output_fd) {
@@ -1450,6 +1537,31 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
if (!forever && status != -1 && !interval)
print_counters(NULL, argc, argv);
+ if (STAT_RECORD) {
+ /*
+ * We synthesize the kernel mmap record just so that older tools
+ * don't emit warnings about not being able to resolve symbols
+ * due to /proc/sys/kernel/kptr_restrict settings and instear provide
+ * a saner message about no samples being in the perf.data file.
+ *
+ * This also serves to suppress a warning about f_header.data.size == 0
+ * in header.c. -acme
+ */
+ int fd = perf_data_file__fd(&perf_stat.file);
+ int err = perf_event__synthesize_kernel_mmap((void *)&perf_stat,
+ process_synthesized_event,
+ &perf_stat.session->machines.host);
+ if (err) {
+ pr_warning("Couldn't synthesize the kernel mmap record, harmless, "
+ "older tools may produce warnings about this file\n.");
+ }
+
+ perf_stat.session->header.data_size += perf_stat.bytes_written;
+ perf_session__write_header(perf_stat.session, evsel_list, fd, true);
+
+ perf_session__delete(perf_stat.session);
+ }
+
perf_stat__exit_aggr_mode();
perf_evlist__free_stats(evsel_list);
out: