[tip:perf/core] perf stat record: Synthesize stat record data

tip-bot for Jiri Olsa
2015-12-18T09:09:37Z

Commit-ID: 8b99b1a4e0b082ea6a277766982dac84483d4d3c
Gitweb: http://git.kernel.org/tip/8b99b1a4e0b082ea6a277766982dac84483d4d3c
Author: Jiri Olsa <jolsa@kernel.org>
AuthorDate: Thu, 5 Nov 2015 15:40:48 +0100
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Thu, 17 Dec 2015 15:15:18 -0300

perf stat record: Synthesize stat record data

Synthesizing needed stat record data for report/script:
- cpu/thread maps
- stat config

Committer note:

New records generated on a perf.data file with this patch:

$ perf report -D | grep PERF_RECORD_
0x568 [0x28]: PERF_RECORD_THREAD_MAP nr: 1 thread: 29097
0x590 [0x12]: PERF_RECORD_CPU_MAP nr: 1 cpu: 65535
0x5a2 [0x40]: PERF_RECORD_STAT_CONFIG
$

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: Kan Liang <kan.liang@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1446734469-11352-5-git-send-email-jolsa@kernel.org
[ Adjusted wrt kernel PERF_RECORD_MMAP added when introducing 'perf stat record' ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-stat.c | 56 ++++++++++++++++++++++++++++++++++++-----------
1 file changed, 43 insertions(+), 13 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index c9c896a..45bf4d2 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -217,26 +217,20 @@ 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)
+static int process_synthesized_event(struct perf_tool *tool __maybe_unused,
+ union perf_event *event,
+ struct perf_sample *sample __maybe_unused,
+ struct machine *machine __maybe_unused)
{
- if (perf_data_file__write(stat->session->file, bf, size) < 0) {
+ if (perf_data_file__write(&perf_stat.file, event, event->header.size) < 0) {
pr_err("failed to write perf data, error: %m\n");
return -1;
}

- stat->bytes_written += size;
+ perf_stat.bytes_written += event->header.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
@@ -323,6 +317,35 @@ static void workload_exec_failed_signal(int signo __maybe_unused, siginfo_t *inf
workload_exec_errno = info->si_value.sival_int;
}

+static int perf_stat_synthesize_config(void)
+{
+ int err;
+
+ err = perf_event__synthesize_thread_map2(NULL, evsel_list->threads,
+ process_synthesized_event,
+ NULL);
+ if (err < 0) {
+ pr_err("Couldn't synthesize thread map.\n");
+ return err;
+ }
+
+ err = perf_event__synthesize_cpu_map(NULL, evsel_list->cpus,
+ process_synthesized_event, NULL);
+ if (err < 0) {
+ pr_err("Couldn't synthesize thread map.\n");
+ return err;
+ }
+
+ err = perf_event__synthesize_stat_config(NULL, &stat_config,
+ process_synthesized_event, NULL);
+ if (err < 0) {
+ pr_err("Couldn't synthesize config.\n");
+ return err;
+ }
+
+ return 0;
+}
+
static int __run_perf_stat(int argc, const char **argv)
{
int interval = stat_config.interval;
@@ -403,6 +426,10 @@ static int __run_perf_stat(int argc, const char **argv)
fd, false);
if (err < 0)
return err;
+
+ err = perf_stat_synthesize_config();
+ if (err < 0)
+ return err;
}

/*
@@ -1560,7 +1587,10 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
* 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
+ * in header.c at the moment 'perf stat record' gets introduced, which
+ * is not really needed once we start adding the stat specific PERF_RECORD_
+ * records, but the need to suppress the kptr_restrict messages in older
+ * tools remain -acme
*/
int fd = perf_data_file__fd(&perf_stat.file);
int err = perf_event__synthesize_kernel_mmap((void *)&perf_stat,