[all-commits] [llvm/llvm-project] a816f9: [scudo] Add new fast purge option. (#175266)

[Christopher Ferris via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a816f922fa73828b24008a8cdd0a28448eed68ef
      https://github.com/llvm/llvm-project/commit/a816f922fa73828b24008a8cdd0a28448eed68ef
  Author: Christopher Ferris <cferris1000 at users.noreply.github.com>
  Date:   2026-02-11 (Wed, 11 Feb 2026)

  Changed paths:
    M compiler-rt/lib/scudo/standalone/common.h
    M compiler-rt/lib/scudo/standalone/include/scudo/interface.h
    M compiler-rt/lib/scudo/standalone/primary32.h
    M compiler-rt/lib/scudo/standalone/primary64.h
    M compiler-rt/lib/scudo/standalone/secondary.h
    M compiler-rt/lib/scudo/standalone/tests/combined_test.cpp
    M compiler-rt/lib/scudo/standalone/wrappers_c.inc

  Log Message:
  -----------
  [scudo] Add new fast purge option. (#175266)

This adds a new option to do a faster of a purge.

When doing a release to OS due to a purge call, if another thread is
also doing a release, the call can be blocked while that operation
concludes. In some cases, code wants a fast version that releases as
fast as possible and the call will not block.

For example, on Android, when destroying a Bitmap a purge occurs to save
memory. But this can cause some jank if the purge takes too long.

In the future, I envision that this option will also do a calculation to
stop purging after some cutoff value to avoid being blocked in this call
for too long.



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