Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S934502AbcDMIXw (ORCPT <rfc822;w@1wt.eu>);
	Wed, 13 Apr 2016 04:23:52 -0400
Received: from szxga01-in.huawei.com ([58.251.152.64]:29919 "EHLO
	szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S934384AbcDMIVu (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Wed, 13 Apr 2016 04:21:50 -0400
From: Wang Nan <wangnan0@huawei.com>
To: <acme@kernel.org>
CC: <linux-kernel@vger.kernel.org>, <pi3orama@163.com>,
        Wang Nan <wangnan0@huawei.com>, He Kuang <hekuang@huawei.com>,
        "Arnaldo Carvalho de Melo" <acme@redhat.com>,
        Jiri Olsa <jolsa@kernel.org>,
        Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
        Namhyung Kim <namhyung@kernel.org>, Zefan Li <lizefan@huawei.com>
Subject: [PATCH 00/10] perf tools: Use SIGUSR2 control data dumpping
Date: Wed, 13 Apr 2016 08:21:03 +0000
Message-ID: <1460535673-159866-1-git-send-email-wangnan0@huawei.com>
X-Mailer: git-send-email 1.8.3.4
MIME-Version: 1.0
Content-Type: text/plain
X-Originating-IP: [10.107.193.248]
X-CFilter-Loop: Reflected
X-Mirapoint-Virus-RAPID-Raw: score=unknown(0),
	refid=str=0001.0A020206.570E018C.006C,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0,
	ip=0.0.0.0,
	so=2013-06-18 04:22:30,
	dmn=2013-03-21 17:37:32
X-Mirapoint-Loop-Id: 40126380fa15705bbe358f272dd1df5f
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
Content-Length: 2690
Lines: 69

This patch set is a preparation to support overwritable ring buffer.
However, even without the kernel side core patch [1] is accept this
patch set is still useful.

With this patch set, perf switches output when receiving SIGUSR2. For
example:

 # perf record -a -F99 --switch-output &
 [1] 26435
 # kill -s SIGUSR2 26435
 [ perf record: dump data: Woken up 1 times ]
 # [ perf record: Dump perf.data.2016041323544373 ]
 # kill -s SIGUSR2 26435
 [ perf record: dump data: Woken up 1 times ]
 # [ perf record: Dump perf.data.2016041323544730 ]
 # fg
 perf record -a -F99 --switch-output
 ^C[ perf record: Woken up 1 times to write data ]
 [ perf record: Dump perf.data.2016041323545019 ]
 [ perf record: Captured and wrote 0.395 MB perf.data.<timestamp> ]

User can periodically generates perf trace with a simple script, then
remove most of them, only keeps scripts collected when something
unusual is detected.

After [1], perf can be totally silent before receiving SIGUSR2. Trace
is collected in kernel overwritable ring buffer, and dumpped when
SIGUSR2 is received.

[1] http://lkml.kernel.org/r/1459865478-53413-1-git-send-email-wangnan0@huawei.com

Cc: Wang Nan <wangnan0@huawei.com>
Cc: 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

Wang Nan (10):
  perf tools: Make ordered_events reusable
  perf tools: Add perf_data_file__switch() helper
  perf record: Turns auxtrace_snapshot_enable into 3 states
  perf record: Add '--timestamp-filename' option to append timestamp to
    output filename
  perf record: Split output into multiple files via '--switch-output'
  perf record: Force enable --timestamp-filename when --switch-output is
    provided
  perf record: Disable buildid cache options by default in switch output
    mode
  perf record: Re-synthesize tracking events after output switching
  perf record: Generate tracking events for process forked by perf
  perf core: Add backward attribute to perf event

 include/linux/perf_event.h       |  28 +++++-
 include/uapi/linux/perf_event.h  |   3 +-
 kernel/events/core.c             |  48 ++++++++-
 kernel/events/ring_buffer.c      |  16 ++-
 tools/perf/builtin-record.c      | 208 +++++++++++++++++++++++++++++++++++----
 tools/perf/util/data.c           |  41 ++++++++
 tools/perf/util/data.h           |  11 ++-
 tools/perf/util/ordered-events.c |   9 ++
 tools/perf/util/ordered-events.h |   1 +
 tools/perf/util/session.c        |   6 +-
 10 files changed, 341 insertions(+), 30 deletions(-)

-- 
1.8.3.4