[PATCH] perf record: Fix zomible status of child process

From: desire <yuwang.yu@huawei.com>
To: <a.p.zijlstra@chello.nl>, <paulus@samba.org>, <mingo@redhat.com>,
	<acme@kernel.org>
Cc: <linux-kernel@vger.kernel.org>, <yuwang.yu@huawei.com>
Subject: [PATCH] perf record: Fix zomible status of child process
Date: Sat, 3 Jan 1970 11:54:47 +0700	[thread overview]
Message-ID: <190487-3155-1-git-send-email-yuwang.yu@huawei.com> (raw)

If the child process exited between the following code,
the child process will keep zomible status and perf process
will keep "poll" forever
if (done || draining)
       break;
---//child process exit, done to 1
err = perf_evlist__poll(rec->evlist,-1);
so, change timeout to 1 second.
---
 tools/perf/builtin-record.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index c3efdfb..0b242eb 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -486,7 +486,9 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
 		if (hits == rec->samples) {
 			if (done || draining)
 				break;
-			err = perf_evlist__poll(rec->evlist, -1);
+			do{
+			err = perf_evlist__poll(rec->evlist, 1000);
+			}while((0 == err) && !done);
 			/*
 			 * Propagate error, only if there's any. Ignore positive
 			 * number of returned events and interrupt error.
-- 
1.7.9.5

