Message-ID: <530C4330.20706@huawei.com>
Date: Tue, 25 Feb 2014 15:16:00 +0800
From: xiakaixu <xiakaixu@huawei.com>
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To: <a.p.zijlstra@chello.nl>, <paulus@samba.org>, <mingo@redhat.com>,
        <acme@ghostprotocols.net>
CC: <linux-kernel@vger.kernel.org>, Huxinwei <huxinwei@huawei.com>,
        Genghui <hui.geng@huawei.com>, <peifeiyue@huawei.com>
Subject: Re: A Bug Inquiry in linux/tools/perf/builtin-record.c
References: <53040D7F.3000905@huawei.com>
In-Reply-To: <53040D7F.3000905@huawei.com>
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?? 2014/2/19 9:48, xiakaixu д??:
> 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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