[Webkit-unassigned] [Bug 227001] New: Too much CPU time is spent under MemoryPressureHandler::currentMemoryUsagePolicy()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=227001

            Bug ID: 227001
           Summary: Too much CPU time is spent under
                    MemoryPressureHandler::currentMemoryUsagePolicy()
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cdumez at apple.com
                CC: bfulgham at webkit.org, nham at apple.com,
                    simon.fraser at apple.com, zalan at apple.com

Too much CPU time is spent under MemoryPressureHandler::currentMemoryUsagePolicy().

Looking at profiles of our WebContent processes, we frequently see traces like these:
Sample Count, Samples %, Normalized CPU %, Symbol
31, 0.0%, 0.0%, WebCore::RenderLayerCompositor::cacheAcceleratedCompositingFlags() (in WebCore)
30, 0.0%, 0.0%,     WTF::MemoryPressureHandler::currentMemoryUsagePolicy() (in JavaScriptCore)
30, 0.0%, 0.0%,         task_info (in libsystem_kernel.dylib)

It is a decent amount of samples and shows several times per process.

We should try and minimize calls to WTF::MemoryPressureHandler::currentMemoryUsagePolicy() to reduce CPU usage.

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