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Groups > linux.kernel > #1306253

[PATCH 48/53] perf tools: Enable overwrite settings

From Wang Nan <wangnan0@huawei.com>
Newsgroups linux.kernel
Subject [PATCH 48/53] perf tools: Enable overwrite settings
Date 2016-01-11 15:00 +0100
Message-ID <qPLaS-38k-81@gated-at.bofh.it> (permalink)
References <qPL17-34y-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

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This patch allows following config terms and option:

 # perf record --overwrite ...

   Globally set following events to overwrite;

 # perf record --event cycles/overwrite/ ...
 # perf record --event cycles/no-overwrite/ ...

Set specific events to be overwrite or no-overwrite.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Signed-off-by: He Kuang <hekuang@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
---
 tools/perf/builtin-record.c    |  1 +
 tools/perf/perf.h              |  1 +
 tools/perf/util/evsel.c        |  4 ++++
 tools/perf/util/evsel.h        |  2 ++
 tools/perf/util/parse-events.c | 14 ++++++++++++++
 tools/perf/util/parse-events.h |  4 +++-
 tools/perf/util/parse-events.l |  2 ++
 7 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index e55a23f..8e56f92 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1267,6 +1267,7 @@ struct option __record_options[] = {
 	OPT_BOOLEAN_SET('i', "no-inherit", &record.opts.no_inherit,
 			&record.opts.no_inherit_set,
 			"child tasks do not inherit counters"),
+	OPT_BOOLEAN(0, "overwrite", &record.opts.overwrite, "use overwrite mode"),
 	OPT_UINTEGER('F', "freq", &record.opts.user_freq, "profile at this frequency"),
 	OPT_CALLBACK('m', "mmap-pages", &record.opts, "pages[,pages]",
 		     "number of mmap data pages and AUX area tracing mmap pages",
diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 90129ac..71f305b 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -58,6 +58,7 @@ struct record_opts {
 	bool	     full_auxtrace;
 	bool	     auxtrace_snapshot_mode;
 	bool	     record_switch_events;
+	bool	     overwrite;
 	unsigned int freq;
 	unsigned int mmap_pages;
 	unsigned int auxtrace_mmap_pages;
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index f1b633e..6932b8b 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -670,6 +670,9 @@ static void apply_config_terms(struct perf_evsel *evsel,
 			 */
 			attr->inherit = term->val.inherit ? 1 : 0;
 			break;
+		case PERF_EVSEL__CONFIG_TERM_OVERWRITE:
+			evsel->overwrite = term->val.overwrite ? 1 : 0;
+			break;
 		default:
 			break;
 		}
@@ -745,6 +748,7 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts)
 
 	attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
 	attr->inherit	    = !opts->no_inherit;
+	evsel->overwrite    = opts->overwrite;
 
 	perf_evsel__set_sample_bit(evsel, IP);
 	perf_evsel__set_sample_bit(evsel, TID);
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 8932a5c..c76e385 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -44,6 +44,7 @@ enum {
 	PERF_EVSEL__CONFIG_TERM_CALLGRAPH,
 	PERF_EVSEL__CONFIG_TERM_STACK_USER,
 	PERF_EVSEL__CONFIG_TERM_INHERIT,
+	PERF_EVSEL__CONFIG_TERM_OVERWRITE,
 	PERF_EVSEL__CONFIG_TERM_MAX,
 };
 
@@ -57,6 +58,7 @@ struct perf_evsel_config_term {
 		char	*callgraph;
 		u64	stack_user;
 		bool	inherit;
+		bool	overwrite;
 	} val;
 };
 
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 03d18f4..c1d4f39 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -855,6 +855,12 @@ do {									   \
 	case PARSE_EVENTS__TERM_TYPE_NOINHERIT:
 		CHECK_TYPE_VAL(NUM);
 		break;
+	case PARSE_EVENTS__TERM_TYPE_OVERWRITE:
+		CHECK_TYPE_VAL(NUM);
+		break;
+	case PARSE_EVENTS__TERM_TYPE_NOOVERWRITE:
+		CHECK_TYPE_VAL(NUM);
+		break;
 	case PARSE_EVENTS__TERM_TYPE_NAME:
 		CHECK_TYPE_VAL(STR);
 		break;
@@ -892,6 +898,8 @@ static int config_term_tracepoint(struct perf_event_attr *attr,
 	case PARSE_EVENTS__TERM_TYPE_STACKSIZE:
 	case PARSE_EVENTS__TERM_TYPE_INHERIT:
 	case PARSE_EVENTS__TERM_TYPE_NOINHERIT:
+	case PARSE_EVENTS__TERM_TYPE_OVERWRITE:
+	case PARSE_EVENTS__TERM_TYPE_NOOVERWRITE:
 		return config_term_common(attr, term, err);
 	default:
 		if (err) {
@@ -961,6 +969,12 @@ do {								\
 		case PARSE_EVENTS__TERM_TYPE_NOINHERIT:
 			ADD_CONFIG_TERM(INHERIT, inherit, term->val.num ? 0 : 1);
 			break;
+		case PARSE_EVENTS__TERM_TYPE_OVERWRITE:
+			ADD_CONFIG_TERM(OVERWRITE, overwrite, term->val.num ? 1 : 0);
+			break;
+		case PARSE_EVENTS__TERM_TYPE_NOOVERWRITE:
+			ADD_CONFIG_TERM(OVERWRITE, overwrite, term->val.num ? 0 : 1);
+			break;
 		default:
 			break;
 		}
diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
index c34615f..29cc804 100644
--- a/tools/perf/util/parse-events.h
+++ b/tools/perf/util/parse-events.h
@@ -68,7 +68,9 @@ enum {
 	PARSE_EVENTS__TERM_TYPE_CALLGRAPH,
 	PARSE_EVENTS__TERM_TYPE_STACKSIZE,
 	PARSE_EVENTS__TERM_TYPE_NOINHERIT,
-	PARSE_EVENTS__TERM_TYPE_INHERIT
+	PARSE_EVENTS__TERM_TYPE_INHERIT,
+	PARSE_EVENTS__TERM_TYPE_NOOVERWRITE,
+	PARSE_EVENTS__TERM_TYPE_OVERWRITE,
 };
 
 struct parse_events_array {
diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
index 27d567f..2ef6f96 100644
--- a/tools/perf/util/parse-events.l
+++ b/tools/perf/util/parse-events.l
@@ -202,6 +202,8 @@ call-graph		{ return term(yyscanner, PARSE_EVENTS__TERM_TYPE_CALLGRAPH); }
 stack-size		{ return term(yyscanner, PARSE_EVENTS__TERM_TYPE_STACKSIZE); }
 inherit			{ return term(yyscanner, PARSE_EVENTS__TERM_TYPE_INHERIT); }
 no-inherit		{ return term(yyscanner, PARSE_EVENTS__TERM_TYPE_NOINHERIT); }
+overwrite		{ return term(yyscanner, PARSE_EVENTS__TERM_TYPE_OVERWRITE); }
+no-overwrite		{ return term(yyscanner, PARSE_EVENTS__TERM_TYPE_NOOVERWRITE); }
 ,			{ return ','; }
 "/"			{ BEGIN(INITIAL); return '/'; }
 {name_minus}		{ return str(yyscanner, PE_NAME); }
-- 
1.8.3.4

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[PATCH 00/53] perf tools: Bugfix, BPF improvement and perf record flight record mode Wang Nan <wangnan0@huawei.com> - 2016-01-11 14:50 +0100
  [PATCH 44/53] perf tools: Automatically add new channel according to evlist Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:00 +0100
  [PATCH 01/53] perf tools: Add -lutil in python lib list for broken python-config Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:00 +0100
    Re: [PATCH 01/53] perf tools: Add -lutil in python lib list for  broken python-config Jiri Olsa <jolsa@redhat.com> - 2016-01-12 10:50 +0100
    [tip:perf/urgent] perf tools:   Add -lutil in python lib list for broken python-config tip-bot for Wang Nan <tipbot@zytor.com> - 2016-01-12 11:10 +0100
  [PATCH 09/53] perf: bpf: Fix build breakage due to libbpf Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:00 +0100
    [tip:perf/urgent] perf bpf: Fix build breakage due to libbpf "tip-bot for Naveen N. Rao" <tipbot@zytor.com> - 2016-01-12 11:20 +0100
  [PATCH 52/53] perf record: Toggle tailsize ring buffer for reading Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:00 +0100
  [PATCH 17/53] perf test: Improve bp_signal Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:00 +0100
    Re: [PATCH 17/53] perf test: Improve bp_signal Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-11 22:40 +0100
      Re: [PATCH 17/53] perf test: Improve bp_signal "Wangnan (F)" <wangnan0@huawei.com> - 2016-01-12 05:20 +0100
      Re: [PATCH 17/53] perf test: Improve bp_signal Jiri Olsa <jolsa@redhat.com> - 2016-01-12 10:30 +0100
        Re: [PATCH 17/53] perf test: Improve bp_signal Will Deacon <will.deacon@arm.com> - 2016-01-12 15:20 +0100
        Re: [PATCH 17/53] perf test: Improve bp_signal Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-12 15:20 +0100
  [PATCH 47/53] perf record: Don't read from and poll overwrite channel Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:00 +0100
  [PATCH 28/53] perf tools: Move timestamp creation to util Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:00 +0100
  [PATCH 39/53] perf record: Re-synthesize tracking events after output switching Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:00 +0100
  [PATCH 33/53] perf record: Introduce record__finish_output() to finish a perf.data Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:00 +0100
  [PATCH 46/53] perf tools: Squash overwrite setting into channel Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:00 +0100
  [PATCH 34/53] perf record: Use OPT_BOOLEAN_SET for buildid cache related options Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:00 +0100
  [PATCH 43/53] perf tools: Add evlist channel helpers Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:00 +0100
  [PATCH 51/53] perf record: Read from tailsize ring buffer Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:00 +0100
  [PATCH 42/53] perf record: Prevent reading invalid data in record__mmap_read Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:00 +0100
    Re: [PATCH 42/53] perf record: Prevent reading invalid data in  record__mmap_read Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> - 2016-01-11 15:30 +0100
      Re: [PATCH 42/53] perf record: Prevent reading invalid data in  record__mmap_read Arnaldo Carvalho de Melo <acme@redhat.com> - 2016-01-11 16:10 +0100
      Re: [PATCH 42/53] perf record: Prevent reading invalid data in  record__mmap_read Arnaldo Carvalho de Melo <acme@redhat.com> - 2016-01-11 16:10 +0100
  [PATCH 40/53] perf record: Generate tracking events for process forked by perf Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:00 +0100
  [PATCH 41/53] perf record: Ensure return non-zero rc when mmap fail Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:00 +0100
  [PATCH 49/53] perf tools: Consider TAILSIZE bit when caclulate is_pos Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:00 +0100
  [PATCH 31/53] perf tools: Add perf_data_file__switch() helper Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:00 +0100
  [PATCH 50/53] perf tools: Set tailsize attribut bit for overwrite events Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:00 +0100
  [PATCH 45/53] perf tools: Operate multiple channels Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:00 +0100
  [PATCH 30/53] perf record: Extract synthesize code to record__synthesize() Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:00 +0100
  [PATCH 07/53] tools: Move Makefile.arch from perf/config to tools/scripts Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:00 +0100
    Re: [PATCH 07/53] tools: Move Makefile.arch from perf/config to tools/scripts "Wangnan (F)" <wangnan0@huawei.com> - 2016-01-11 15:10 +0100
      Re: [PATCH 07/53] tools: Move Makefile.arch from perf/config to  tools/scripts Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-11 15:20 +0100
    [tip:perf/urgent] tools: Move Makefile.arch from perf/  config to tools/scripts tip-bot for Wang Nan <tipbot@zytor.com> - 2016-01-12 11:20 +0100
  [PATCH 53/53] perf record: Allow generate tracking events at the end of output Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:00 +0100
  [PATCH 48/53] perf tools: Enable overwrite settings Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:00 +0100
  [PATCH 11/53] perf test: Fix false TEST_OK result for 'perf test hist' Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:10 +0100
    Re: [PATCH 11/53] perf test: Fix false TEST_OK result for 'perf test  hist' Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> - 2016-01-11 15:30 +0100
      Re: [PATCH 11/53] perf test: Fix false TEST_OK result for 'perf test  hist' Arnaldo Carvalho de Melo <acme@redhat.com> - 2016-01-11 16:00 +0100
        Re: [PATCH 11/53] perf test: Fix false TEST_OK result for 'perf test  hist' Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-11 16:40 +0100
    [tip:perf/urgent] perf test: Fix false TEST_OK result for '  perf test hist' tip-bot for Wang Nan <tipbot@zytor.com> - 2016-01-12 11:20 +0100
  [PATCH 15/53] perf tools: Fix symbols searching for offline module in buildid-cache Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:10 +0100
  [PATCH 06/53] perf tools: Fix PowerPC native building Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:10 +0100
    [tip:perf/urgent] perf tools: Fix PowerPC native building tip-bot for Wang Nan <tipbot@zytor.com> - 2016-01-12 11:20 +0100
  [PATCH 23/53] perf tools: Support setting different slots in a BPF map separately Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:10 +0100
  [PATCH 02/53] perf tools: Fix phony build target for build-test Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:10 +0100
    [tip:perf/urgent] perf tools:   Fix phony build target for build-test tip-bot for Wang Nan <tipbot@zytor.com> - 2016-01-12 11:20 +0100
  [PATCH 19/53] perf tools: Enable BPF object configure syntax Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:10 +0100
  [PATCH 05/53] perf tools: Test correct path of perf in build-test Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:10 +0100
    Re: [PATCH 05/53] perf tools: Test correct path of perf in build-test Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-11 16:30 +0100
      Re: [PATCH 05/53] perf tools: Test correct path of perf in build-test Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-11 23:10 +0100
        Re: [PATCH 05/53] perf tools: Test correct path of perf in build-test Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-11 23:40 +0100
          Re: [PATCH 05/53] perf tools: Test correct path of perf in build-test Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-11 23:50 +0100
            Re: [PATCH 05/53] perf tools: Test correct path of perf in build-test "Wangnan (F)" <wangnan0@huawei.com> - 2016-01-12 08:20 +0100
              Re: [PATCH 05/53] perf tools: Test correct path of perf in build-test Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-12 15:10 +0100
  [PATCH 20/53] perf record: Apply config to BPF objects before recording Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:10 +0100
  [PATCH 14/53] perf test: Check environment before start real BPF test Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:10 +0100
    Re: [PATCH 14/53] perf test: Check environment before start real BPF  test Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-11 23:00 +0100
      Re: [PATCH 14/53] perf test: Check environment before start real  BPF test "Wangnan (F)" <wangnan0@huawei.com> - 2016-01-12 08:50 +0100
  [PATCH 26/53] perf data: Support converting data from bpf_perf_event_output() Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:10 +0100
  [PATCH 36/53] perf record: Split output into multiple files via '--switch-output' Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:10 +0100
  [PATCH 12/53] perf test: Reset err after using it hold errcode in hist testcases Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:10 +0100
    [tip:perf/urgent] perf test:   Reset err after using it hold errcode in hist testcases tip-bot for Wang Nan <tipbot@zytor.com> - 2016-01-12 11:20 +0100
  [PATCH 29/53] perf tools: Make ordered_events reusable Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:10 +0100
    Re: [PATCH 29/53] perf tools: Make ordered_events reusable Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-11 22:40 +0100
  [PATCH 04/53] perf tools: Pass O option to Makefile.perf in build-test Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:10 +0100
  [PATCH 32/53] perf record: Turns auxtrace_snapshot_enable into 3 states Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:10 +0100
  [PATCH 16/53] perf tools: Fix mmap2 event allocation in synthesize code Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:10 +0100
    Re: [PATCH 16/53] perf tools: Fix mmap2 event allocation in  synthesize code Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-11 22:10 +0100
      [PATCH 16/53 v2] perf tools: Fix mmap2 event allocation in synthesize code Wang Nan <wangnan0@huawei.com> - 2016-01-12 11:20 +0100
        RE: [PATCH 16/53 v2] perf tools: Fix mmap2 event allocation in  synthesize code 平松雅巳 / HIRAMATU,MASAMI   <masami.hiramatsu.pt@hitachi.com> - 2016-01-12 11:50 +0100
          Re: [PATCH 16/53 v2] perf tools: Fix mmap2 event allocation in synthesize  code "Wangnan (F)" <wangnan0@huawei.com> - 2016-01-12 12:00 +0100
            Re: [PATCH 16/53 v2] perf tools: Fix mmap2 event allocation in  synthesize code "acme@kernel.org" <acme@kernel.org> - 2016-01-12 15:30 +0100
              RE: [PATCH 16/53 v2] perf tools: Fix mmap2 event allocation in  synthesize code 平松雅巳 / HIRAMATU,MASAMI   <masami.hiramatsu.pt@hitachi.com> - 2016-01-13 01:50 +0100
        [tip:perf/urgent] perf tools:   Fix mmap2 event allocation in synthesize code tip-bot for Wang Nan <tipbot@zytor.com> - 2016-01-13 10:50 +0100
  [PATCH 08/53] perf tools: Add missing sources in perf's MANIFEST Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:10 +0100
  [PATCH 21/53] perf tools: Enable passing event to BPF object Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:10 +0100
  [PATCH 25/53] perf tools: Introduce bpf-output event Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:20 +0100
  [PATCH 18/53] perf tools: Add API to config maps in bpf object Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:20 +0100
  [PATCH 24/53] perf tools: Enable indices setting syntax for BPF maps Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:20 +0100
  [PATCH 22/53] perf tools: Support perf event alias name Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:20 +0100
  [PATCH 13/53] perf tools: Prevent calling machine__delete() on non-allocated machine Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:20 +0100
    Re: [PATCH 13/53] perf tools: Prevent calling machine__delete() on  non-allocated machine Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-11 16:50 +0100
      Re: [PATCH 13/53] perf tools: Prevent calling machine__delete() on  non-allocated machine "Wangnan (F)" <wangnan0@huawei.com> - 2016-01-12 08:10 +0100
        Re: [PATCH 13/53] perf tools: Prevent calling machine__delete() on  non-allocated machine Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-12 15:10 +0100
  [PATCH 10/53] tools build: Add BPF feature check to test-all Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:20 +0100
    [tip:perf/urgent] tools build: Add BPF feature check to test-all tip-bot for Wang Nan <tipbot@zytor.com> - 2016-01-12 11:20 +0100
  [PATCH 37/53] perf record: Force enable --timestamp-filename when --switch-output is provided Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:20 +0100
  [PATCH 03/53] perf tools: Set parallel making options build-test Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:20 +0100
  [PATCH 35/53] perf record: Add '--timestamp-filename' option to append timestamp to output filename Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:30 +0100
  [PATCH 38/53] perf record: Disable buildid cache options by default in switch output mode Wang Nan <wangnan0@huawei.com> - 2016-01-11 15:30 +0100

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