[webkit-changes] [WebKit/WebKit] 6bed96: Revert use of separate megapage heap in libpas

[David Degazio]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 6bed96b90169acee3768919ebfe47fa3579067e4
      https://github.com/WebKit/WebKit/commit/6bed96b90169acee3768919ebfe47fa3579067e4
  Author: David Degazio <d_degazio at apple.com>
  Date:   2025-01-08 (Wed, 08 Jan 2025)

  Changed paths:
    M Source/bmalloc/libpas/src/libpas/pas_create_basic_heap_page_caches_with_reserved_memory.c

  Log Message:
  -----------
  Revert use of separate megapage heap in libpas
https://bugs.webkit.org/show_bug.cgi?id=285620
rdar://142561181

Reviewed by Yusuke Suzuki and Mark Lam.

Reverts megapage allocations coming from a separate megapage
large heap, allocating them out of the common large heap instead.
Also adds a profiling macro to let us collect some info about
how often this happens.

* Source/bmalloc/libpas/src/libpas/pas_create_basic_heap_page_caches_with_reserved_memory.c:
(allocate_from_megapages):

Canonical link: https://commits.webkit.org/288613@main



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