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 <[email protected]> Signed-off-by: Jiri Olsa <[email protected]> Cc: Arnaldo Carvalho de Melo <[email protected]> Cc: Corey Ashford <[email protected]> Cc: Frederic Weisbecker <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Arnaldo Carvalho de Melo <[email protected]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
