[Webkit-unassigned] [Bug 69201] New: All of JSC's heuristics should be in one place for easier tuning

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=69201

           Summary: All of JSC's heuristics should be in one place for
                    easier tuning
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: fpizlo at apple.com


Currenty JavaScriptCore has a large number of heuristic settings, such as optimization thresholds, recompilation thresholds, optimization delay thresholds, etc.  There are also a lot of old heuristics from even before tiered compilation, such as the maximum size of polymorphic access lists and the thrash thresholds for creating dictionaries and despecifying functions.

It would be great to have these thresholds in one file (or at least a handful of files), so that it is easier to reason about their relationships.

Settings that do not have to be in a header (because they are not accessed frequently and because they don't determine the layout of classes) should be in a .cpp file, so that they can be changed without recompiling all of WebKit.

Other settings should be in the corresponding header (of the same name), to make it easier to find them.

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