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

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Message-ID: <53040D7F.3000905@huawei.com>
Date:	Wed, 19 Feb 2014 09:48:47 +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: A Bug Inquiry in linux/tools/perf/builtin-record.c

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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