[all-commits] [llvm/llvm-project] 64da33: ELF: Introduce --randomize-section-padding option.

[Peter Collingbourne via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 64da33a58923e60a5c7854c1a13e14f16d01b1f0
      https://github.com/llvm/llvm-project/commit/64da33a58923e60a5c7854c1a13e14f16d01b1f0
  Author: Peter Collingbourne <peter at pcc.me.uk>
  Date:   2024-12-13 (Fri, 13 Dec 2024)

  Changed paths:
    M lld/ELF/Config.h
    M lld/ELF/Driver.cpp
    M lld/ELF/Options.td
    M lld/ELF/OutputSections.h
    M lld/ELF/SyntheticSections.cpp
    M lld/ELF/SyntheticSections.h
    M lld/ELF/Writer.cpp
    M lld/docs/ld.lld.1
    A lld/test/ELF/randomize-section-padding.test

  Log Message:
  -----------
  ELF: Introduce --randomize-section-padding option.

The --randomize-section-padding option randomly inserts padding between
input sections using the given seed. It is intended to be used in A/B
experiments to determine the average effect of a change on program
performance, while controlling for effects such as false sharing in
the cache which may introduce measurement bias. For more details,
see the RFC:

https://discourse.llvm.org/t/rfc-lld-feature-for-controlling-for-code-size-dependent-measurement-bias/83334

Reviewers: smithp35, MaskRay

Reviewed By: MaskRay, smithp35

Pull Request: https://github.com/llvm/llvm-project/pull/117653



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