linux-kernel - [PATCH 17/32] perf/core: adding pmu::event

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Message-Id: <1461905018-86355-18-git-send-email-davidcc@google.com>
Date:	Thu, 28 Apr 2016 21:43:23 -0700
From:	David Carrillo-Cisneros <davidcc@...gle.com>
To:	Peter Zijlstra <peterz@...radead.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...hat.com>
Cc:	Vikas Shivappa <vikas.shivappa@...ux.intel.com>,
	Matt Fleming <matt.fleming@...el.com>,
	Tony Luck <tony.luck@...el.com>,
	Stephane Eranian <eranian@...gle.com>,
	Paul Turner <pjt@...gle.com>,
	David Carrillo-Cisneros <davidcc@...gle.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 17/32] perf/core: adding pmu::event_terminate

Allow a PMU to clean an event before the event's torn down in
perf_events begins.

Reviewed-by: Stephane Eranian <eranian@...gle.com>
Signed-off-by: David Carrillo-Cisneros <davidcc@...gle.com>
---
 include/linux/perf_event.h | 6 ++++++
 kernel/events/core.c       | 4 ++++
 2 files changed, 10 insertions(+)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index b010b55..81e29c6 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -265,6 +265,12 @@ struct pmu {
 	int (*event_init)		(struct perf_event *event);
 
 	/*
+	 * Terminate the event for this PMU. Optional complement for a
+	 * successful event_init. Called before the event fields are tear down.
+	 */
+	void (*event_terminate)		(struct perf_event *event);
+
+	/*
 	 * Notification that the event was mapped or unmapped.  Called
 	 * in the context of the mapping task.
 	 */
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 6fd226f..2a868a6 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -3787,6 +3787,8 @@ static void _free_event(struct perf_event *event)
 		ring_buffer_attach(event, NULL);
 		mutex_unlock(&event->mmap_mutex);
 	}
+	if (event->pmu->event_terminate)
+		event->pmu->event_terminate(event);
 
 	if (is_cgroup_event(event))
 		perf_detach_cgroup(event);
@@ -8293,6 +8295,8 @@ err_per_task:
 	exclusive_event_destroy(event);
 
 err_pmu:
+	if (event->pmu->event_terminate)
+		event->pmu->event_terminate(event);
 	if (event->destroy)
 		event->destroy(event);
 	module_put(pmu->module);
-- 
2.8.0.rc3.226.g39d4020