Chnages 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 <t...@kernel.org> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Jiri Olsa <jo...@kernel.org> Cc: Alexey Budankov <alexey.budan...@linux.intel.com> Song Liu (1): perf: Sharing PMU counters across compatible events include/linux/perf_event.h | 61 ++++++++ kernel/events/core.c | 281 +++++++++++++++++++++++++++++++++++-- 2 files changed, 332 insertions(+), 10 deletions(-) -- 2.17.1
