[Webkit-unassigned] [Bug 195322] REGRESSION(r236862): early frame decoupling leaves JSC ArrayBuffer objects lingering

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=195322

--- Comment #1 from Zan Dobersek <zan at falconsigh.net> ---
Created attachment 363624

  --> https://bugs.webkit.org/attachment.cgi?id=363624&action=review

Heap logging patch

This patch adds more detailed dumps of extra memory statistics during GC, and provides a rundown of to-be-swept ArrayBuffer objects contained in GCIncomingRefCountedSet<ArrayBuffer>.

Here's the output on the last GC for a JetStream run:

> GCIncomingRefCountedSet::sweep(): m_vector[24]
>   object 0x3f08a8780, deferred 1, refCount 0, 16 incoming references
>   object 0x3fc45a180, deferred 1, refCount 0, 16 incoming references
>   object 0x3f1c40140, deferred 1, refCount 0, 11 incoming references
>   object 0x3fb415b40, deferred 1, refCount 0, 12 incoming references
>   object 0x3fa48b900, deferred 1, refCount 0, 16 incoming references
>   object 0x3fb8cbdc0, deferred 1, refCount 0, 12 incoming references
>   object 0x3f2d489c0, deferred 1, refCount 0, 11 incoming references
>   object 0x3fbf72100, deferred 1, refCount 0, 11 incoming references
>   object 0x3f7278c00, deferred 1, refCount 0, 16 incoming references
>   object 0x4073a84c0, deferred 1, refCount 0, 16 incoming references
>   object 0x3f0da24c0, deferred 1, refCount 0, 11 incoming references
>   object 0x3f2696540, deferred 1, refCount 0, 12 incoming references
>   object 0x3fc663280, deferred 1, refCount 0, 16 incoming references
>   object 0x3f2d86c80, deferred 1, refCount 0, 12 incoming references
>   object 0x3f2bf1100, deferred 1, refCount 0, 11 incoming references
>   object 0x3f5dfca00, deferred 1, refCount 0, 11 incoming references
>   object 0x3f6c6a940, deferred 1, refCount 0, 16 incoming references
>   object 0x3f53a2340, deferred 1, refCount 0, 16 incoming references
>   object 0x415615980, deferred 1, refCount 0, 13 incoming references
>   object 0x3f8508ec0, deferred 1, refCount 0, 14 incoming references
>   object 0x3ed269140, deferred 1, refCount 0, 44 incoming references
>   object 0x3f6255700, deferred 1, refCount 0, 16 incoming references
>   object 0x40170e2c0, deferred 1, refCount 0, 13 incoming references
>   object 0x411f0f280, deferred 1, refCount 0, 13 incoming references
>
> bytesAllocatedThisCycle = 313249
> totalBytesVisited = 13801072, currentHeapSize = 13801072
> extraMemorySize() = 759166003, currentHeapSize = 772967075
>   m_extraMemorySize = 4189747, m_deprecatedExtraMemorySize = 0, m_arrayBuffers.size() = 754976256
> Full: maxHeapSize = 1545934150
> Full: maxEdenSize = 772967075
> Full: sizeAfterLastFullCollect = 772967075
> Full: bytesAbandonedSinceLastFullCollect = 0
> sizeAfterLastCollect = 772967075

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