perf/core: Provide a kernel-internal interface to recalibrate event period

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Currently, perf_event_period() is used by user tools via ioctl. Based on
naming convention, exporting perf_event_period() for kernel users (such
as KVM) who may recalibrate the event period for their assigned counter
according to their requirements.

The perf_event_period() is an external accessor, just like the
perf_event_{en,dis}able() and should thus use perf_event_ctx_lock().

Suggested-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Like Xu <like.xu@linux.intel.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Like Xu 2019-10-27 18:52:38 +08:00 • committed by Paolo Bonzini

parent 02d496cfb8

commit 3ca270fc9e

2 changed files with 26 additions and 7 deletions

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5

include/linux/perf_event.h

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28

kernel/events/core.c

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