[PATCH v4 0/9] perf, x86: large PEBS interrupt threshold

[Yan, Zheng]

This patch series implements large PEBS interrupt threshold. For some
limited cases, it can significantly reduce the sample overhead. Please
read patch 6's commit message for more information.

changes since v1:
  - drop patch 'perf, core: Add all PMUs to pmu_idr'
  - add comments for case that multiple counters overflow simultaneously
changes since v2:
  - rename perf_sched_cb_{enable,disable} to perf_sched_cb_user_{inc,dec} 
  - use flag to indicate auto reload mechanism
  - move codes that setup PEBS sample data to separate function
  - output the PEBS records in batch 
  - enable this for All (PEBS capable) hardware 
  - more description for the multiplex
changes since v3:
  - ignore conflicting PEBS record
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