linux-kernel - Re: A Bug Inquiry in linux/tools/perf/builtin-record.c

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Date:	Tue, 25 Feb 2014 15:16:00 +0800
From:	xiakaixu <xiakaixu@...wei.com>
To:	<a.p.zijlstra@...llo.nl>, <paulus@...ba.org>, <mingo@...hat.com>,
	<acme@...stprotocols.net>
CC:	<linux-kernel@...r.kernel.org>, Huxinwei <huxinwei@...wei.com>,
	Genghui <hui.geng@...wei.com>, <peifeiyue@...wei.com>
Subject: Re: A Bug Inquiry in linux/tools/perf/builtin-record.c

于 2014/2/19 9:48, xiakaixu 写道:
> Hi all,
> 
> There is a bug found in my work when running "perf record". The basic information
> is here. As we know, perf record is a parent process and the programme traced is
> a child process when running "perf record". Sometimes the child process become
> zombie state and disappear until the parent process is killed. The bug stays in linux/
> tools/perf/builtin-record.c.
> *********************************************************************
> static int __cmd_record(struct perf_record *rec, int argc, const char **argv)
>     ......
> 	if (hits == rec->samples) {
>                          if (done)
>                                  break;
>                          err = poll(evsel_list->pollfd, evsel_list->nr_fds, -1);
>                          waking++;
>                  }
>     ......
> *********************************************************************
> The parent process still call the function
> poll(evsel_list->pollfd, evsel_list->nr_fds, -1) when the child process has exited
> already, which caused a zombie process.
> 
> May I have your opinion ?
> Waiting for your reply!
> 
> Best Regards
> Kaixu Xia
> 


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