Changes v4 -> v5:
1. Rebase upon latest tip/perf/core.
2. Remove prototype from v4 (2/2).
Changes v3 -> v4:
1. In __perf_install_in_context() always reprogram ctx for cpu and cgroup
events to make sure event duplications set up properly.
2. Add a prototype (2/2) to show potential solution of sharing PMU among
CPU events and task events.
Changes v2 -> v3:
1. Simplified event_pmu_add() as Jiri Olsa suggested
Changes v1 -> v2:
1. Fixed a bug reported by 0day kernel testing robot
This is to follow up earlier discussion on sharing hardware PMU counters
across compatible events:
https://marc.info/?t=151213803600016
https://marc.info/?t=152547569200001
This version limits PMU sharing to events within same ctx. As a result,
compatible events are not evaluated during task schedule. This vesion also
limits PMU sharing to hardware counting events. From our discussion with
internal users, this is sufficient for most cases.
This version introduces virtual master event. The virtual master event
does require careful handling. But it is makes the logic of event add/del
cleaner.
Cc: Tejun Heo <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Jiri Olsa <[email protected]>
Song Liu (1):
perf: Sharing PMU counters across compatible events
include/linux/perf_event.h | 61 ++++++++
kernel/events/core.c | 294 ++++++++++++++++++++++++++++++++++---
2 files changed, 332 insertions(+), 23 deletions(-)
--
2.17.1
