Messages in this thread Patch in this message | | | From | Robert Richter <> | Subject | [PATCH v2 10/14] perf, persistent: Avoid adding identical events | Date | Tue, 11 Jun 2013 18:42:36 +0200 |
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From: Robert Richter <robert.richter@linaro.org>
Check if an event already exists before adding it.
Signed-off-by: Robert Richter <robert.richter@linaro.org> Signed-off-by: Robert Richter <rric@kernel.org> --- kernel/events/persistent.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/kernel/events/persistent.c b/kernel/events/persistent.c index 586cea5..4fcd071 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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