REGRESSION(250548@main): Early WebProcess exit on 32-bit platforms since memory limit is zero

[Olivier Blin]

In 250548@main, the memory limit in MemoryPressureHandler is set to a least 7 GB for active process.
This value is stored in a size_t variable, but this is limited to 4 GB on 32-bit platforms.

The memory limit is truncated down to 0, which triggers a WebProcess exit after the first MemoryPressure check.

[Olivier Blin]

Pull request: https://github.com/WebKit/WebKit/pull/4381

[Miguel Gomez]

Folks, this is already being handled in https://bugs.webkit.org/show_bug.cgi?id=241012.

The PR for this addresses the value overflow, but what should be done is that WebKitGTK and WPE shouldn't use those values at all.

[Chris Dumez]

(In reply to Miguel Gomez from comment #2)
> Folks, this is already being handled in
> https://bugs.webkit.org/show_bug.cgi?id=241012.
> 
> The PR for this addresses the value overflow, but what should be done is
> that WebKitGTK and WPE shouldn't use those values at all.

I think https://github.com/WebKit/WebKit/pull/4381 is valuable no matter what. 

If you want to disable this handling for WebKitGTK and WPE and fine but that's a separate issue from the overflow handling on 32bit.

[EWS]

Committed 254533@main (b0895ea02d48): <https://commits.webkit.org/254533@main>

Reviewed commits have been landed. Closing PR #4381 and removing active labels.

[Radar WebKit Bug Importer]

<rdar://problem/99989909>

[Miguel Gomez]

*** Bug 241012 has been marked as a duplicate of this bug. ***