Bug 154014

Summary: [iOS] Throw away some unlinked code when navigating to a new page.
Product: WebKit Reporter: Andreas Kling <kling>
Component: WebCore JavaScriptAssignee: Andreas Kling <kling>
Status: REOPENED    
Severity: Normal CC: barraclough, cdumez, commit-queue, japhet, keith_miller, kling, mark.lam, msaboff, saam
Priority: P2 Keywords: Performance
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
Bug Depends on: 154026    
Bug Blocks:    
Attachments:
Description Flags
Patch none

Andreas Kling
Reported 2016-02-08 15:55:10 PST
Let's throw away even more code when leaving a page!
Attachments
Patch (5.39 KB, patch)
2016-02-08 15:56 PST, Andreas Kling 		no flags
DetailsFormatted DiffDiff
View All Add attachment proposed patch, testcase, etc.
Andreas Kling
Comment 1 2016-02-08 15:56:26 PST
Created attachment 270890 [details] Patch
WebKit Commit Bot
Comment 2 2016-02-08 18:22:30 PST
Comment on attachment 270890 [details] Patch Clearing flags on attachment: 270890 Committed r196286: <http://trac.webkit.org/changeset/196286>
WebKit Commit Bot
Comment 3 2016-02-08 18:22:35 PST
All reviewed patches have been landed. Closing bug.
WebKit Commit Bot
Comment 4 2016-02-09 04:35:05 PST
Re-opened since this is blocked by bug 154026
Andreas Kling
Comment 5 2016-02-09 04:37:49 PST
Seems like this does bad things to iOS PLT. Possibly due to CodeCache vending executables for functions, not unlinkedcodeblocks. So this code might be nuking the unlinked code for those, assuming that Heap tracks CodeCache executables. Need to look into it. Also this was a much smaller win on bots than throwing away linked code was.
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