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perf-core-2022-10-07

perf-core-2022-10-07: Perf events updates for v6.1:
tagged this 07 Oct 07:29 
 - PMU driver updates:

     - Add AMD Last Branch Record Extension Version 2 (LbrExtV2)
       feature support for Zen 4 processors.

     - Extend the perf ABI to provide branch speculation information,
       if available, and use this on CPUs that have it (eg. LbrExtV2).

     - Improve Intel PEBS TSC timestamp handling & integration.

     - Add Intel Raptor Lake S CPU support.

     - Add 'perf mem' and 'perf c2c' memory profiling support on
       AMD CPUs by utilizing IBS tagged load/store samples.

     - Clean up & optimize various x86 PMU details.

 - HW breakpoints:

     - Big rework to optimize the code for systems with hundreds of CPUs and
       thousands of breakpoints:

        - Replace the nr_bp_mutex global mutex with the bp_cpuinfo_sem
	  per-CPU rwsem that is read-locked during most of the key operations.

	- Improve the O(#cpus * #tasks) logic in toggle_bp_slot()
	  and fetch_bp_busy_slots().

	- Apply micro-optimizations & cleanups.

  - Misc cleanups & enhancements.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
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