linux-kernel - [PATCH 12/16] perf, persistent: Avoid adding identical events

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Date:	Fri, 31 May 2013 10:47:32 +0200
From:	Robert Richter <rric@...nel.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	linux-kernel@...r.kernel.org,
	Robert Richter <robert.richter@...xeda.com>
Subject: [PATCH 12/16] perf, persistent: Avoid adding identical events

From: Robert Richter <robert.richter@...xeda.com>

Check if an event already exists before adding it.

Signed-off-by: Robert Richter <robert.richter@...xeda.com>
---
 kernel/events/persistent.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/kernel/events/persistent.c b/kernel/events/persistent.c
index ebef089..1e93b51 100644
--- a/kernel/events/persistent.c
+++ b/kernel/events/persistent.c
@@ -40,6 +40,12 @@ add_persistent_event_on_cpu(unsigned int cpu, struct perf_event_attr *attr,
 
 	mutex_lock(&per_cpu(pers_events_lock, cpu));
 
+	desc = get_persistent_event(cpu, attr);
+	if (desc) {
+		event = ERR_PTR(-EEXIST);
+		goto out;
+	}
+
 	desc = kzalloc(sizeof(*desc), GFP_KERNEL);
 	if (!desc) {
 		event = ERR_PTR(-ENOMEM);
-- 
1.8.1.1

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