Messages in this thread | | | From | Song Liu <> | Subject | [PATCH v2 0/1] perf: Sharing PMU counters across compatible events | Date | Wed, 15 Aug 2018 10:03:12 -0700 |
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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 <tj@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
Song Liu (1): perf: Sharing PMU counters across compatible events
include/linux/perf_event.h | 61 ++++++++ kernel/events/core.c | 289 +++++++++++++++++++++++++++++++++++-- 2 files changed, 340 insertions(+), 10 deletions(-)
-- 2.17.1
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