Hi xiakaixu,
> 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!
Do you have a real bug report based on this?
AFAIK perf record installed a signal handler for SIGCHLD so it'll set
the 'done' variable when child exits and then break the loop.
Thanks,
Namhyung
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