[webkit-changes] [WebKit/WebKit] ae91c4: Trigger GC when crossing warning threshold on iOS

[bnham]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: ae91c42fd27e0a7f0b05af5edf0245b5b36805d7
      https://github.com/WebKit/WebKit/commit/ae91c42fd27e0a7f0b05af5edf0245b5b36805d7
  Author: Ben Nham <nham at apple.com>
  Date:   2024-05-09 (Thu, 09 May 2024)

  Changed paths:
    M Source/WebCore/page/MemoryRelease.cpp

  Log Message:
  -----------
  Trigger GC when crossing warning threshold on iOS
https://bugs.webkit.org/show_bug.cgi?id=273830
rdar://127677553

Reviewed by Geoffrey Garen.

On iOS where we have fairly strict memory limits, sometimes the mutator can get far ahead of the
GC. We might wait until a PROC_LIMIT_CRITICAL event fires before a full GC occurs, at which point
the process is already eligible to be killed by the OS.

To try and reduce the number of foreground OOMs, let's also trigger a full GC if it hasn't occurred
recently when a PROC_LIMIT_WARNING event fires (which is 80% of the critical threshold).

* Source/WebCore/page/MemoryRelease.cpp:
(WebCore::releaseMemory):

Canonical link: https://commits.webkit.org/278567@main



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