diff options
| author | Kan Liang <kan.liang@linux.intel.com> | 2020-07-23 10:11:10 -0700 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2020-08-18 16:34:36 +0200 |
| commit | 9f0c4fa111dc909ca545c45ea20ec84da555ce16 (patch) | |
| tree | 8844a4fa766a0e13506fa6dd81d5fd428df31bb1 /include/linux/perf_event.h | |
| parent | 58da7dbe6f036fefe504a4bb452afbd39bba73f7 (diff) | |
perf/core: Add a new PERF_EV_CAP_SIBLING event capability
Current perf assumes that events in a group are independent. Close an
event doesn't impact the value of the other events in the same group.
If the closed event is a member, after the event closure, other events
are still running like a group. If the closed event is a leader, other
events are running as singleton events.
Add PERF_EV_CAP_SIBLING to allow events to indicate they require being
part of a group, and when the leader dies they cannot exist
independently.
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200723171117.9918-8-kan.liang@linux.intel.com
Diffstat (limited to 'include/linux/perf_event.h')
| -rw-r--r-- | include/linux/perf_event.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 04a49ccc7beb..6048650f8c1d 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -576,9 +576,13 @@ typedef void (*perf_overflow_handler_t)(struct perf_event *, * PERF_EV_CAP_SOFTWARE: Is a software event. * PERF_EV_CAP_READ_ACTIVE_PKG: A CPU event (or cgroup event) that can be read * from any CPU in the package where it is active. + * PERF_EV_CAP_SIBLING: An event with this flag must be a group sibling and + * cannot be a group leader. If an event with this flag is detached from the + * group it is scheduled out and moved into an unrecoverable ERROR state. */ #define PERF_EV_CAP_SOFTWARE BIT(0) #define PERF_EV_CAP_READ_ACTIVE_PKG BIT(1) +#define PERF_EV_CAP_SIBLING BIT(2) #define SWEVENT_HLIST_BITS 8 #define SWEVENT_HLIST_SIZE (1 << SWEVENT_HLIST_BITS) |