On 6 August 2016 at 22:12, David Carrillo-Cisneros <davi...@google.com> wrote: > This patch series adds a new flag to the struct perf_event > (and a flag field to store it) to allow a PMU to tag a CPU or > cgroup event as readable from any CPU in the same package and not > just the CPU where the is currently active. > > This capability is used with uncore events to potentially avoid > an unnecessary IPI when executing perf_event_read. > > A previous version of this change was introduced in the last Intel's > CQM/CMT driver series (under review), but now we present it separately > here since it is also useful for other uncore events. > > The next version of Intel CQM/CMT will add 3 new flags that use > the pmu_event_flags field (added in patch 03 in this series). > > Patch 02 generalizes event->group_flags so that new flags can use it > in a similar way that PERF_GROUP_SOFTWARE was used. > > Patches rebased at peterz/queue/perf/core > > Changes in v2: > - Change logic to use event->group_flags instead of individually > testing sibling in perf_event_read. > - Remove erroneous read of inactive events. > > David Carrillo-Cisneros (4): > perf/core: check return value of perf_event_read IPI > perf/core: generalize event->group_flags > perf/core: introduce PMU_EV_CAP_READ_ACTIVE_PKG > perf/x86: use PMUEF_READ_CPU_PKG in uncore events > > arch/x86/events/intel/rapl.c | 2 ++ > arch/x86/events/intel/uncore.c | 2 ++ > arch/x86/events/intel/uncore_snb.c | 2 ++ > include/linux/perf_event.h | 21 +++++++++++---- > kernel/events/core.c | 52 > +++++++++++++++++++++++++------------- > 5 files changed, 57 insertions(+), 22 deletions(-) > > -- > 2.8.0.rc3.226.g39d4020 >
Reviewed-by: Nilay Vaish <nilayva...@gmail.com>
