[webkit-changes] [WebKit/WebKit] eca96f: Cache ImageBufferIOSurfaceBackend volatility state.

[mattwoodrow]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: eca96fd4401bb2c7c76a7a211394846a66d2b66d
      https://github.com/WebKit/WebKit/commit/eca96fd4401bb2c7c76a7a211394846a66d2b66d
  Author: Matt Woodrow <mattwoodrow at apple.com>
  Date:   2023-03-09 (Thu, 09 Mar 2023)

  Changed paths:
    M Source/WebCore/platform/graphics/cg/ImageBufferIOSurfaceBackend.cpp

  Log Message:
  -----------
  Cache ImageBufferIOSurfaceBackend volatility state.
https://bugs.webkit.org/show_bug.cgi?id=242430

Reviewed by Simon Fraser.

Setting the volatility state requires a syscall, which we can avoid if we already know
we're in the right state. This looks to help MotionMark performance.

* Source/WebCore/platform/graphics/cg/ImageBufferIOSurfaceBackend.cpp:
(WebCore::ImageBufferIOSurfaceBackend::ImageBufferIOSurfaceBackend):
(WebCore::ImageBufferIOSurfaceBackend::setVolatile):
(WebCore::ImageBufferIOSurfaceBackend::setNonVolatile):

Canonical link: https://commits.webkit.org/261464@main