δΊ 2014/2/19 9:48, xiakaixu ει:
> 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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