x86/perf, static_call: Optimize x86_pmu methods

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Replace many of the indirect calls with static_call().

The average PMI time, as measured by perf_sample_event_took()*:

  PRE:    3283.03 [ns]
  POST:   3145.12 [ns]

Which is a ~138 [ns] win per PMI, or a ~4.2% decrease.

[*] on an IVB-EP, using: 'perf record -a -e cycles -- make O=defconfig-build/ -j80'

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20200818135805.338001015@infradead.org

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Peter Zijlstra 2020-08-18 15:57:53 +02:00 • committed by Ingo Molnar

parent d25e37d89d

commit 7c9903c9bf

1 changed files with 94 additions and 40 deletions

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arch/x86/events/core.c

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