129920 2014-03-07 14:34:59 -0800 MarkedBlocks that are "full enough" shouldn't be swept after EdenCollections 2014-03-12 09:22:19 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 mhahnenberg mhahnenberg ggaren jer.noble oldest_to_newest 988355 0 mhahnenberg 2014-03-07 14:34:59 -0800 Imagine a Heap this is completely full after an EdenCollection. The next allocation could potentially walk every atom of every MarkedBlock that its MarkedAllocator has. To avoid this situation we should ignore MarkedBlocks that are "full enough" so we can avoid this linear cost sweep phase. 989463 1 226449 mhahnenberg 2014-03-11 16:50:41 -0700 Created attachment 226449 Patch 989482 2 226458 mhahnenberg 2014-03-11 18:19:38 -0700 Created attachment 226458 Patch 989485 3 226458 ggaren 2014-03-11 18:28:39 -0700 Comment on attachment 226458 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=226458&action=review r=me > Source/JavaScriptCore/heap/MarkedSpace.cpp:-317 > -#ifndef NDEBUG > - VerifyNewlyAllocated verifyFunctor; > - forEachBlock(verifyFunctor); > -#endif Why no verify? 989488 4 mhahnenberg 2014-03-11 18:33:01 -0700 (In reply to comment #3) > (From update of attachment 226458 [details]) > View in context: https://bugs.webkit.org/attachment.cgi?id=226458&action=review > > r=me > > > Source/JavaScriptCore/heap/MarkedSpace.cpp:-317 > > -#ifndef NDEBUG > > - VerifyNewlyAllocated verifyFunctor; > > - forEachBlock(verifyFunctor); > > -#endif > > Why no verify? I can undo that one. In an older version of the patch I was using m_newlyAllocated but no longer. 989493 5 mhahnenberg 2014-03-11 18:46:33 -0700 Committed r165458: <http://trac.webkit.org/changeset/165458> 989652 6 jer.noble 2014-03-12 09:22:19 -0700 This commit may have caused the fast/workers/worker-gc.html test to begin crashing <https://bugs.webkit.org/show_bug.cgi?id=130135> 226449 2014-03-11 16:50:41 -0700 2014-03-11 18:19:26 -0700 Patch bug-129920-20140311164555.patch text/plain 12647 mhahnenberg SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMTY1NDU0KQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDQ0IEBA CisyMDE0LTAzLTExICBNYXJrIEhhaG5lbmJlcmcgIDxtaGFobmVuYmVyZ0BhcHBsZS5jb20+CisK KyAgICAgICAgTWFya2VkQmxvY2tzIHRoYXQgYXJlICJmdWxsIGVub3VnaCIgc2hvdWxkbid0IGJl 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