[all-commits] [llvm/llvm-project] ab17ec: [scudo] Add ConditionVariable in SizeClassAllocato...

[ChiaHungDuan via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ab17ecd107670cd843a9074e4d0bc33810abcf5e
      https://github.com/llvm/llvm-project/commit/ab17ecd107670cd843a9074e4d0bc33810abcf5e
  Author: ChiaHungDuan <chiahungduan at google.com>
  Date:   2023-10-19 (Thu, 19 Oct 2023)

  Changed paths:
    M compiler-rt/lib/scudo/standalone/CMakeLists.txt
    M compiler-rt/lib/scudo/standalone/allocator_config.h
    A compiler-rt/lib/scudo/standalone/condition_variable.h
    A compiler-rt/lib/scudo/standalone/condition_variable_base.h
    A compiler-rt/lib/scudo/standalone/condition_variable_linux.cpp
    A compiler-rt/lib/scudo/standalone/condition_variable_linux.h
    M compiler-rt/lib/scudo/standalone/primary64.h
    M compiler-rt/lib/scudo/standalone/tests/CMakeLists.txt
    M compiler-rt/lib/scudo/standalone/tests/combined_test.cpp
    A compiler-rt/lib/scudo/standalone/tests/condition_variable_test.cpp
    M compiler-rt/lib/scudo/standalone/tests/primary_test.cpp

  Log Message:
  -----------
  [scudo] Add ConditionVariable in SizeClassAllocator64 (#69031)

This may improve the waiting of `Region->MMLock` while trying to refill
the freelist. Instead of always waiting on the completion of
`populateFreeListAndPopBatch()` or `releaseToOSMaybe()`, `pushBlocks()`
also refills the freelist. This increases the chance of earlier return
from `popBatches()`.

The support of condition variable hasn't been done for all platforms.
Therefore, add another `popBatchWithCV()` and it can be configured in
the allocator configuration by setting `Primary::UseConditionVariable`
and the desired `ConditionVariableT`.

Reviewed By: cferris

Differential Revision: https://reviews.llvm.org/D156146