perf/core: Add speculation info to branch entries

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Add a new "spec" bitfield to branch entries for providing speculation
information. This will be populated using hints provided by branch sampling
features on supported hardware. The following cases are covered:

  * No branch speculation information is available
  * Branch is speculative but taken on the wrong path
  * Branch is non-speculative but taken on the correct path
  * Branch is speculative and taken on the correct path

Suggested-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Sandipan Das <sandipan.das@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/834088c302faf21c7b665031dd111f424e509a64.1660211399.git.sandipan.das@amd.com

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Sandipan Das 2022-08-11 18:00:00 +05:30 • committed by Peter Zijlstra

parent 245268c19f

commit 93315e46b0

2 changed files with 15 additions and 1 deletions

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1

include/linux/perf_event.h

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15

include/uapi/linux/perf_event.h

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