linux-kernel - [PATCH 08/21] perf: Add new 'paused' attribute

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Date:	Wed, 25 Sep 2013 14:50:34 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Jiri Olsa <jolsa@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: [PATCH 08/21] perf: Add new 'paused' attribute

Adding new 'paused' perf_event_attr attribute bit. It sets
the initial event state as paused, so it wont get started
until it's triggered by toggling mechanism.

Original-patch-by: Frederic Weisbecker <fweisbec@...il.com>
Signed-off-by: Jiri Olsa <jolsa@...hat.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 include/uapi/linux/perf_event.h | 3 ++-
 kernel/events/core.c            | 3 +++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index b941c21..1539c47 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -278,8 +278,9 @@ struct perf_event_attr {
 				exclude_callchain_kernel : 1, /* exclude kernel callchains */
 				exclude_callchain_user   : 1, /* exclude user callchains */
 				mmap2          :  1, /* include mmap with inode data     */
+				paused         :  1, /* create as paused */
 
-				__reserved_1   : 40;
+				__reserved_1   : 39;
 
 	union {
 		__u32		wakeup_events;	  /* wakeup every n events */
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 2c8ff93..f5f00a6 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -6731,6 +6731,9 @@ perf_event_alloc(struct perf_event_attr *attr, int cpu,
 
 	event->state		= PERF_EVENT_STATE_INACTIVE;
 
+	if (attr->paused)
+		event->paused = true;
+
 	if (task) {
 		event->attach_state = PERF_ATTACH_TASK;
 
-- 
1.7.11.7

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