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From: Namhyung Kim <namhyung@kernel.org>
To: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>,
	Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Paul Mackerras <paulus@samba.org>, Ingo Molnar <mingo@kernel.org>,
	Namhyung Kim <namhyung.kim@lge.com>,
	LKML <linux-kernel@vger.kernel.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Stephane Eranian <eranian@google.com>
Subject: Re: [PATCH 09/14] perf ftrace: Add 'record' sub-command
Date: Mon, 06 May 2013 10:57:13 +0900	[thread overview]
Message-ID: <87ehdk98g6.fsf@sejong.aot.lge.com> (raw)
In-Reply-To: <517A84B2.40209@gmail.com> (David Ahern's message of "Fri, 26 Apr 2013 07:44:18 -0600")

Hi David,

On Fri, 26 Apr 2013 07:44:18 -0600, David Ahern wrote:
> On 4/25/13 12:24 AM, Namhyung Kim wrote:
>> But it looks there's a race between cond_wait() and cond_broatcast().
>> I'll take a look at that.
>
> Why not use eventfd or a pipe for the signalling instead?

Thanks for your feedback!

I didn't have an idea of using eventfd for this case.  Does it helpful
to prevent such a deadlock like this?

Thanks,
Namhyung

  reply	other threads:[~2013-05-06  1:57 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-04-23  8:30 [RFC 00/14] perf tools: Introduce new 'ftrace' command Namhyung Kim
2013-04-23  8:30 ` [PATCH 01/14] perf util: Move debugfs/tracing helper functions to util.c Namhyung Kim
2013-04-24 12:32   ` Jiri Olsa
2013-04-23  8:31 ` [PATCH 02/14] perf util: Use evsel->name to get tracepoint_paths Namhyung Kim
2013-04-23 13:07   ` Steven Rostedt
2013-04-24 10:36     ` Namhyung Kim
2013-04-24 12:42   ` Jiri Olsa
2013-04-25  5:58     ` Namhyung Kim
2013-04-23  8:31 ` [PATCH 03/14] perf util: Save pid-cmdline mapping into tracing header Namhyung Kim
2013-04-23  8:31 ` [PATCH 04/14] perf util: Add more debug message on failure path Namhyung Kim
2013-04-23  8:31 ` [PATCH 05/14] perf tools: Introduce new 'ftrace' tool Namhyung Kim
2013-04-24 14:09   ` Jiri Olsa
2013-04-25  6:06     ` Namhyung Kim
2013-04-25  9:09       ` Jiri Olsa
2013-04-25  9:51         ` Namhyung Kim
2013-04-25 13:05           ` Steven Rostedt
2013-04-25 14:49             ` Jiri Olsa
2013-04-26 13:34             ` David Ahern
2013-04-26 13:50               ` Steven Rostedt
2013-04-23  8:31 ` [PATCH 06/14] perf ftrace: Add support for --pid option Namhyung Kim
2013-04-23  8:31 ` [PATCH 07/14] perf ftrace: Add support for -a and -C option Namhyung Kim
2013-04-23  8:31 ` [PATCH 08/14] perf ftrace: Split "live" sub-command Namhyung Kim
2013-04-23  8:31 ` [PATCH 09/14] perf ftrace: Add 'record' sub-command Namhyung Kim
2013-04-24 14:12   ` Jiri Olsa
2013-04-25  6:24     ` Namhyung Kim
2013-04-26  8:35       ` Jiri Olsa
2013-04-26 13:44       ` David Ahern
2013-05-06  1:57         ` Namhyung Kim [this message]
2013-05-06  3:22           ` David Ahern
2013-05-06  1:44       ` Namhyung Kim
2013-05-06 12:04         ` Jiri Olsa
2013-05-08  5:27           ` Namhyung Kim
2013-04-23  8:31 ` [PATCH 10/14] perf ftrace: Add 'show' sub-command Namhyung Kim
2013-04-23  8:31 ` [PATCH 11/14] perf ftrace: Add 'report' sub-command Namhyung Kim
2013-04-23  8:31 ` [PATCH 12/14] perf ftrace: Use pager for displaying result Namhyung Kim
2013-04-24 14:17   ` Jiri Olsa
2013-04-25  6:50     ` Namhyung Kim
2013-04-26  8:40       ` Jiri Olsa
2013-05-06  1:52         ` Namhyung Kim
2013-05-06 11:38           ` Jiri Olsa
2013-05-08  5:49             ` Namhyung Kim
2013-05-10  9:04               ` Jiri Olsa
2013-05-13  8:53                 ` Namhyung Kim
2013-05-13 13:42                   ` Jiri Olsa
2013-05-14  0:58                     ` Namhyung Kim
2013-04-23  8:31 ` [PATCH 13/14] perf ftrace: Cleanup using ftrace_setup/teardown() Namhyung Kim
2013-04-23  8:31 ` [PATCH 14/14] perf tools: Add document for perf-ftrace command Namhyung Kim
2013-04-23 15:53   ` Steven Rostedt
2013-04-24 10:39     ` Namhyung Kim
2013-04-23 15:58 ` [RFC 00/14] perf tools: Introduce new 'ftrace' command Steven Rostedt
2013-04-23 17:19   ` Pekka Enberg
2013-04-24  6:50     ` Ingo Molnar
2013-04-24  9:52       ` Namhyung Kim
2013-04-24 11:15         ` zhangwei(Jovi)
2013-04-25  5:53           ` Namhyung Kim
2013-04-24  9:29     ` Namhyung Kim
2013-04-24  9:27   ` Namhyung Kim
2013-04-24 11:14     ` zhangwei(Jovi)
2013-04-25  5:45       ` Namhyung Kim

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