[Webkit-unassigned] [Bug 74423] New: [MutationObservers] Avoid allocations if no observers are present

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=74423

           Summary: [MutationObservers] Avoid allocations if no observers
                    are present
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rafaelw at chromium.org
                CC: sam at webkit.org, ojan at chromium.org, rniwa at webkit.org,
                    adamk at chromium.org
            Blocks: 68729


In order to minimize perf impact when there are no mutation observers, the mutation observers dispatch mechanism should avoid the following if it can be quickly determined that no possible observers are present:

-creating the mutation record
-creating the mutation record interest group, which
  -stack allocates a hashmap of observers (which may turn out to be empty)

-- 
Configure bugmail: https://bugs.webkit.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the assignee for the bug.