[all-commits] [llvm/llvm-project] 66274e: Improve documented sampling profiler steps to best...

[Tim Creech via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 66274eb9f7e7fc4b023343476c4d066e4413180a
      https://github.com/llvm/llvm-project/commit/66274eb9f7e7fc4b023343476c4d066e4413180a
  Author: Tim Creech <timothy.m.creech at intel.com>
  Date:   2024-04-29 (Mon, 29 Apr 2024)

  Changed paths:
    M clang/docs/UsersManual.rst

  Log Message:
  -----------
  Improve documented sampling profiler steps to best known methods (#88438)

1. Add `-fdebug-info-for-profiling -funique-internal-linkage-names`,
which improve the usefulness of debug info for profiling.

2. Recommend the use of `br_inst_retired.near_taken:uppp`, which
provides the most precise results on supporting hardware. Mention
`branches:u` as a more portable backup.

Both should portray execution counts better than the default event
(`cycles`) and have a better chance of working as an unprivileged user
due to the `:u` modifier.



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