175041 2017-08-01 12:14:51 -0700 On memory-constrained iOS devices, reduce the rate at which the JS heap grows before a GC to try to keep more memory available for the system 2018-07-13 11:42:41 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified REOPENED InRadar P2 Normal --- 175276 1 saam saam cdumez commit-queue dewei_zhu fpizlo ggaren jfbastien keith_miller mark.lam msaboff rniwa simon.fraser slewis webkit-bug-importer oldest_to_newest 1333887 0 saam 2017-08-01 12:14:51 -0700 patch forthcoming 1333888 1 webkit-bug-importer 2017-08-01 12:15:30 -0700 <rdar://problem/33659370> 1333905 2 316883 saam 2017-08-01 12:36:19 -0700 Created attachment 316883 patch 1333906 3 316883 fpizlo 2017-08-01 12:37:02 -0700 Comment on attachment 316883 patch View in context: https://bugs.webkit.org/attachment.cgi?id=316883&action=review > Source/JavaScriptCore/heap/Heap.cpp:146 > + double memoryUsed = bmalloc::api::percentAvailableMemoryInUse(); > + double result = ((1 - memoryUsed) / 3.5) + 1; > + return heapSize * std::max(std::min(result, 2.0), 1.06); Can we put these constants in Options? 1333907 4 316883 fpizlo 2017-08-01 12:37:14 -0700 Comment on attachment 316883 patch r=me with Options 1333917 5 316886 saam 2017-08-01 13:03:57 -0700 Created attachment 316886 patch for landing 1333919 6 316886 fpizlo 2017-08-01 13:09:09 -0700 Comment on attachment 316886 patch for landing seems good to me 1334115 7 saam 2017-08-01 20:36:04 -0700 I'm holding off on landing this because I think I'm going to make it just apply to all devices with <= 1GB RAM on iOS. 1334144 8 316937 saam 2017-08-01 23:57:56 -0700 Created attachment 316937 patch for landing 1334153 9 316943 saam 2017-08-02 00:20:33 -0700 Created attachment 316943 patch for landing fixed changelog to reflect the new heuristic. 1334227 10 simon.fraser 2017-08-02 08:45:41 -0700 Can we retitle this something like "On memory-contained iOS devices, reduce the rate at which the JS heap grows to keep more memory available for the system" or something? Please re-word to make it accurate. 1334257 11 saam 2017-08-02 09:59:22 -0700 (In reply to Simon Fraser (smfr) from comment #10) > Can we retitle this something like "On memory-contained iOS devices, reduce > the rate at which the JS heap grows to keep more memory available for the > system" or something? Please re-word to make it accurate. This wording SGTM. I’ll change and land once I’m in front of a computer. 1334296 12 316943 mark.lam 2017-08-02 10:57:08 -0700 Comment on attachment 316943 patch for landing View in context: https://bugs.webkit.org/attachment.cgi?id=316943&action=review > Source/JavaScriptCore/heap/Heap.cpp:121 > +static bool useAggressiveHeapTrigger() If I understand the code correctly, the use of proportionalHeapSize() is for determining max heap size, and therefore, it determines when to trigger a GC. I suggest renaming this function to useAggressiveGCTrigger. > Source/JavaScriptCore/runtime/Options.h:216 > + v(bool, forceAggressiveHeapTrigger, false, Normal, "If true, on iOS, we will use a different formula for proportionalHeapSize().") \ > + v(double, aggressiveHeapTriggerMinumumMultiplier, 1.07, Normal, "This is the minimum we must grow by for proportionalHeapSize() when doing aggressive triggering.") \ > + v(double, aggressiveHeapTriggerMaximumMultiplier, 2.0, Normal, "This is the maximum we can grow by for proportionalHeapSize() when doing aggressive triggering.") \ > + v(double, aggressiveHeapTriggerScalingValue, 3.5, Normal, "This scales the above formula. A larger number is more aggressive in limiting heap growth. A smaller number is more permissive in allowing heap growth.") \ I suggest renaming these options as follows: forceAggressiveHeapTrigger => forceAggressiveGCTrigger aggressiveHeapTriggerMinumumMultiplier => aggressiveGCTriggerMinMultiplier aggressiveHeapTriggerMaximumMultiplier => aggressiveGCTriggerMaxMultiplier aggressiveHeapTriggerScalingValue => aggressiveGCTriggerScalingValue Min and max are so commonly use that anyone reading this code should understand them. It'd be nice to have shorted options names. 1334299 13 mark.lam 2017-08-02 10:58:52 -0700 (In reply to Mark Lam from comment #12) > It'd be nice to have shorted options names. *shorter*. Can't type today. 1334313 14 saam 2017-08-02 11:16:05 -0700 landed in: https://trac.webkit.org/changeset/220144/webkit 1336058 15 commit-queue 2017-08-07 11:38:56 -0700 Re-opened since this is blocked by bug 175276 1337130 16 saam 2017-08-09 14:25:52 -0700 wont fix this, it didn't actually help perf. 1441937 17 saam 2018-07-13 11:42:41 -0700 It actually looks like this might be a good idea. 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