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

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Date:	Sat, 3 Jan 1970 11:54:16 +0700
From:	desire <yuwang.yu@...wei.com>
To:	<a.p.zijlstra@...llo.nl>, <paulus@...ba.org>, <mingo@...hat.com>,
	<acme@...nel.org>
CC:	<linux-kernel@...r.kernel.org>
Subject: [PATCH] perf record: Fix zomible status of child process

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

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