[webkit-changes] [WebKit/WebKit] da4298: [WTF] Leave top granule of SequesteredArenaAllocat...

[Marcus Plutowski]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: da4298fbcd76378ad2d2b03a8212ea79854ec94f
      https://github.com/WebKit/WebKit/commit/da4298fbcd76378ad2d2b03a8212ea79854ec94f
  Author: Marcus Plutowski <marcus_plutowski at apple.com>
  Date:   2025-02-27 (Thu, 27 Feb 2025)

  Changed paths:
    M Source/WTF/wtf/DoublyLinkedList.h
    M Source/WTF/wtf/SequesteredAllocator.h

  Log Message:
  -----------
  [WTF] Leave top granule of SequesteredArenaAllocator behind
https://bugs.webkit.org/show_bug.cgi?id=288727
rdar://145760952

Reviewed by Yusuke Suzuki and Yijia Huang.

This is a neat and simple version of a thread-local cache. Since we know
that all objects in the granule will have been freed, we can freely
re-use it for the next allocation cycle -- thereby avoiding the initial
slow-path allocation for the first allocation of a compilation job.
Ideally, the granule size will be large enough that this will suffice
for most jobs.

* Source/WTF/wtf/DoublyLinkedList.h:
(WTF::DoublyLinkedList<T>::splitAt):
* Source/WTF/wtf/SequesteredAllocator.h:

Canonical link: https://commits.webkit.org/291255@main



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