linux-kernel - [tip:perf/core] perf stat record: Write stat events on record

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 18 Dec 2015 01:10:30 -0800
From:	tip-bot for Jiri Olsa <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	dsahern@...il.com, mingo@...nel.org, acme@...hat.com,
	jolsa@...nel.org, kan.liang@...el.com,
	linux-kernel@...r.kernel.org, tglx@...utronix.de,
	namhyung@...nel.org, a.p.zijlstra@...llo.nl, hpa@...or.com
Subject: [tip:perf/core] perf stat record: Write stat events on record

Commit-ID:  5a6ea81b8f9ce2736759d256ac4d63be65751199
Gitweb:     http://git.kernel.org/tip/5a6ea81b8f9ce2736759d256ac4d63be65751199
Author:     Jiri Olsa <jolsa@...nel.org>
AuthorDate: Thu, 5 Nov 2015 15:40:51 +0100
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 17 Dec 2015 16:00:22 -0300

perf stat record: Write stat events on record

Writing stat events on 'perf stat record' at the time we read counter
values from kernel.

Committer note:

After the patch:

  $ perf stat record usleep 1

   Performance counter stats for 'usleep 1':

          0.598006      task-clock (msec)         #    0.484 CPUs utilized
                 1      context-switches          #    0.002 M/sec
                 0      cpu-migrations            #    0.000 K/sec
                52      page-faults               #    0.087 M/sec
           882,744      cycles                    #    1.476 GHz
           581,416      stalled-cycles-frontend   #   65.86% frontend cycles idle
   <not supported>      stalled-cycles-backend
           636,479      instructions              #    0.72  insns per cycle
                                                  #    0.91  stalled cycles per insn
           129,334      branches                  #  216.275 M/sec
             7,512      branch-misses             #    5.81% of all branches

       0.001235157 seconds time elapsed

  $ oldperf evlist
  task-clock
  context-switches
  cpu-migrations
  page-faults
  cycles
  stalled-cycles-frontend
  stalled-cycles-backend
  instructions
  branches
  branch-misses
  $ oldperf report --stdio
  Error:
  The perf.data file has no samples!
  # To display the perf.data header info, please use --header/--header-only options.
  #
  $ perf report -D | grep PERF_RECORD
  0x5b0 [0x28]: PERF_RECORD_THREAD_MAP nr: 1 thread: 5504
  0x5d8 [0x12]: PERF_RECORD_CPU_MAP nr: 1 cpu: 65535
  0x5ea [0x40]: PERF_RECORD_STAT_CONFIG
  0x62a [0x30]: PERF_RECORD_STAT
  0x65a [0x30]: PERF_RECORD_STAT
  0x68a [0x30]: PERF_RECORD_STAT
  0x6ba [0x30]: PERF_RECORD_STAT
  0x6ea [0x30]: PERF_RECORD_STAT
  0x71a [0x30]: PERF_RECORD_STAT
  0x74a [0x30]: PERF_RECORD_STAT
  0x77a [0x30]: PERF_RECORD_STAT
  0x7aa [0x30]: PERF_RECORD_STAT
  -1 -1 0x7da [0x40]: PERF_RECORD_MMAP -1/0: [0xffffffff81000000(0x1f000000) @ 0xffffffff81000000]: x [kernel.kallsyms]_text
  $

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Tested-by: Kan Liang <kan.liang@...el.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/1446734469-11352-8-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-stat.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 8a2f9ce..32aa2ea 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -231,6 +231,18 @@ static int process_synthesized_event(struct perf_tool *tool __maybe_unused,
 	return 0;
 }
 
+#define SID(e, x, y) xyarray__entry(e->sample_id, x, y)
+
+static int
+perf_evsel__write_stat_event(struct perf_evsel *counter, u32 cpu, u32 thread,
+			     struct perf_counts_values *count)
+{
+	struct perf_sample_id *sid = SID(counter, cpu, thread);
+
+	return perf_event__synthesize_stat(NULL, cpu, thread, sid->id, count,
+					   process_synthesized_event, NULL);
+}
+
 /*
  * Read out the results of a single counter:
  * do not aggregate counts across CPUs in system-wide mode
@@ -254,6 +266,13 @@ static int read_counter(struct perf_evsel *counter)
 			count = perf_counts(counter->counts, cpu, thread);
 			if (perf_evsel__read(counter, cpu, thread, count))
 				return -1;
+
+			if (STAT_RECORD) {
+				if (perf_evsel__write_stat_event(counter, cpu, thread, count)) {
+					pr_err("failed to write stat event\n");
+					return -1;
+				}
+			}
 		}
 	}
 
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/