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 <fweis...@gmail.com>
Signed-off-by: Jiri Olsa <jo...@redhat.com>
Cc: Arnaldo Carvalho de Melo <a...@redhat.com>
Cc: Corey Ashford <cjash...@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweis...@gmail.com>
Cc: Ingo Molnar <mi...@elte.hu>
Cc: Paul Mackerras <pau...@samba.org>
Cc: Peter Zijlstra <a.p.zijls...@chello.nl>
Cc: Arnaldo Carvalho de Melo <a...@redhat.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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