linux-kernel - [PATCH] perf, tools: Stop perf stat -p when profiled process exits

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Date:	Tue, 11 Sep 2012 23:09:04 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	acme@...stprotocols.net
Cc:	linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH] perf, tools: Stop perf stat -p when profiled process exits

From: Andi Kleen <ak@...ux.intel.com>

When counting a process with perf stat -p check if the process died
and exit collection if yes.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 tools/perf/builtin-stat.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 861f0ae..1313bb5 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -536,7 +536,14 @@ static int run_perf_stat(int argc __used, const char **argv)
 		if (WIFSIGNALED(status))
 			psignal(WTERMSIG(status), argv[0]);
 	} else {
-		while(!done) sleep(1);
+		char piddir[40];
+		snprintf(piddir, sizeof piddir, "/proc/%d", atoi(target.pid));
+
+		while(!done) {
+			sleep(1);
+			if (target.pid && access(piddir, X_OK) < 0 && errno == ENOENT)
+				break;
+		}
 	}
 
 	t1 = rdclock();
-- 
1.7.7.6

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