[Webkit-unassigned] [Bug 158054] New: Web Inspector: capturing with Allocations timeline causes GC to take 100x longer and cause frame drops

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=158054

            Bug ID: 158054
           Summary: Web Inspector: capturing with Allocations timeline
                    causes GC to take 100x longer and cause frame drops
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
               URL: http://bl.ocks.org/syntagmatic/6c149c08fc9cde682635
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bburg at apple.com
                CC: bburg at apple.com, graouts at webkit.org,
                    joepeck at webkit.org, mattbaker at apple.com,
                    nvasilyev at apple.com, timothy at apple.com,
                    webkit-bug-importer at group.apple.com

STEPS TO REPRODUCE:

1. Make a recording without allocations timeline, note the smooth framerate.
2. Make a new recording with allocations timeline enabled.

EXPECTED:

No change in framerate, maybe a small increase in GC

ACTUAL:

GC time goes from < 1ms to > 60ms, causing visible stutters


NOTES:

The page continues to stutter even after recording is stopped, and after the allocations timeline is turned off. The latter seems to indicate a separate bug, where we don't turn off the extra tracking work during GC.

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