127463 2014-01-22 22:09:11 -0800 3x splay regression in FTL with experimental coverage that is entirely due to Bartlett weirdness 2014-01-23 17:14:19 -0800 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) All All RESOLVED FIXED P2 Normal --- 112840 1 fpizlo fpizlo atrick barraclough ggaren mark.lam mhahnenberg mmirman msaboff nrotem oliver sam oldest_to_newest 971026 0 fpizlo 2014-01-22 22:09:11 -0800 Hopefully, I'll find the right place to zero the stack or do other stuff just like all of the other times. 971027 1 oliver 2014-01-22 22:10:51 -0800 O_o 971028 2 fpizlo 2014-01-22 22:16:24 -0800 (In reply to comment #1) > O_o Dude, it's hilarious. We get one of these every few months. Splay trees imply essentially always inserting at the root and then having the root point at everything else. Broadly speaking any node that was ever a root will continue to indefinitely have a transitive reference to every node that had been part of the tree at that time. So, if you have a benchmark, like Splay, and at some point some pointer to the tree gets stuck on the stack and then you add and remove a bunch of things to the tree, then you end up doubling your heap size. This is because that one stuck pointer will refer to all of the nodes that were the "old" tree at the time it got stuck, even if all of the nodes in that old tree get removed from the actual current tree. But wait, there's more. Because of how removal happens, the stuck pointer will be likely to transitively refer to every node that had ever been part of the tree since when the pointer got stuck until the present time. So, in V8v7/splay, after a pointer gets stuck, you cease to be able to collect any garbage. Interestingly, this almost never happens in-browser and only happens with the way I run splay in my harness. So, it's not all that alarming. In all cases when this happens, it's because a pointer gets stuck due to a goof in either OSR entry or in the GC's stack scan. I'm guessing that this bug is due to FTL OSR entry. 971034 3 fpizlo 2014-01-22 22:34:36 -0800 It looks like it requires that both splay_() and remove() get compiled with the FTL. I can see the regression if just those two get compiled. If I remove either one of them then the regression disappears. 971349 4 fpizlo 2014-01-23 14:45:59 -0800 Ha! This is entirely due to some sloppiness with scratch buffers. I think that we claim to be using one at some point, then we dump a bunch of pointers into it, and then we never "free" it - so the GC keeps rescanning it ad infinitum. 971368 5 222033 fpizlo 2014-01-23 15:40:38 -0800 Created attachment 222033 the patch 971369 6 222033 mhahnenberg 2014-01-23 15:42:41 -0800 Comment on attachment 222033 the patch r=me 971404 7 fpizlo 2014-01-23 17:14:19 -0800 Landed in http://trac.webkit.org/changeset/162666 222033 2014-01-23 15:40:38 -0800 2014-01-23 15:42:40 -0800 the patch blah.patch text/plain 7560 fpizlo SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMTYyNjU1KQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDM0IEBA CisyMDE0LTAxLTIzICBGaWxpcCBQaXpsbyAgPGZwaXpsb0BhcHBsZS5jb20+CisKKyAgICAgICAg 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