213071 2020-06-11 01:44:58 -0700 Replace JSC::FreeList linked list with a Bitmap. 2020-08-09 02:07:00 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified REOPENED InRadar P2 Normal --- 213255 215312 1 mark.lam mark.lam benjamin cdumez cmarcelo commit-queue ews-watchlist fpizlo keith_miller msaboff rmorisset saam tzagallo webkit-bug-importer oldest_to_newest 1661538 0 mark.lam 2020-06-11 01:44:58 -0700 This is an investigation to see if using a Bitmap is faster. We expect it to be. 1661546 1 401630 mark.lam 2020-06-11 02:20:26 -0700 Created attachment 401630 work in progress. 1661724 2 401678 mark.lam 2020-06-11 13:41:52 -0700 Created attachment 401678 test patch 1: does NOT use adjusted bitmap start. 1661725 3 401679 mark.lam 2020-06-11 13:42:45 -0700 Created attachment 401679 test patch 2: does use adjusted bitmap start. 1662330 4 401826 mark.lam 2020-06-12 23:05:24 -0700 Created attachment 401826 test patch 3: post-tuned 1663695 5 402163 mark.lam 2020-06-17 15:58:42 -0700 Created attachment 402163 proposed patch. 1663696 6 402164 mark.lam 2020-06-17 16:12:07 -0700 Created attachment 402164 proposed patch. 1663751 7 402164 fpizlo 2020-06-17 18:44:34 -0700 Comment on attachment 402164 proposed patch. View in context: https://bugs.webkit.org/attachment.cgi?id=402164&action=review > Source/JavaScriptCore/heap/MarkedBlockInlines.h:341 > + freeAtoms ^= cellLocations; You could probably make this faster if it was one loop that did the whole thing. If I’m understanding right we will have a loop here for the ^= and loops above for other parts of the freeAtoms computation. 1663753 8 mark.lam 2020-06-17 18:53:43 -0700 (In reply to Filip Pizlo from comment #7) > Comment on attachment 402164 [details] > proposed patch. > > View in context: > https://bugs.webkit.org/attachment.cgi?id=402164&action=review > > > Source/JavaScriptCore/heap/MarkedBlockInlines.h:341 > > + freeAtoms ^= cellLocations; > > You could probably make this faster if it was one loop that did the whole > thing. If I’m understanding right we will have a loop here for the ^= and > loops above for other parts of the freeAtoms computation. Thanks. I'll look into doing this in a follow up patch as it might get a messy. I'll land the current patch first which has already been tested. 1663754 9 mark.lam 2020-06-17 18:58:08 -0700 Landed in r263195: <http://trac.webkit.org/r263195>. 1663755 10 webkit-bug-importer 2020-06-17 18:59:16 -0700 <rdar://problem/64472738> 1663757 11 402164 rmorisset 2020-06-17 19:15:52 -0700 Comment on attachment 402164 proposed patch. View in context: https://bugs.webkit.org/attachment.cgi?id=402164&action=review This patch looks perfectly reasonable to me, but I am not familiar enough with this code to feel comfortable r+-ing it alone. > Source/JavaScriptCore/ChangeLog:98 > + there is n the location of m_cellSize. It is now moved up next to m_remaining, typo: "n" ? > Source/JavaScriptCore/heap/FreeList.h:108 > + // if there atoms still available for allocation. See comment blob below typo: "there atoms" => "there are atoms" > Source/JavaScriptCore/heap/FreeList.h:119 > + static ptrdiff_t offsetOfBitmapRows() { return OBJECT_OFFSETOF(FreeList, m_bitmap) - sizeof(AtomsBitmap::Word); } Maybe rename to offsetOfBitmapRowsMinusOne, or offsetOneBeforeBitmapRows, or something like this? Just in case anyone tries to use it without looking at where it is defined. > Source/JavaScriptCore/heap/FreeListInlines.h:100 > + while (rowBitmap) { It probably does not matter, but I can think of a way to make this loop a tad more efficient: ``` unsigned atomIndexInRow = 0; while (rowBitmap) { atomIndexInRow += ctz(rowBitmap); auto* cell = bitwise_cast<HeapCell*>(&currentMarkedBlockRowAddress[atomIndexInRow]); rowBitmap >>= (++atomIndexInRow); func(cell); } ``` > Source/JavaScriptCore/jit/AssemblyHelpers.cpp:561 > +#if CPU(ARM64) I am a bit wary that this code will never be tested since BITMAP_FREELIST is currently only set on x86_64. I don't have a better solution though. It is also a bit weird to have both "#if CPU(ARM64)" and "if (isARM64())", but just "if (isx86_64())". What is the criterion for picking one of these ways of checking the CPU? 1663762 12 402164 mark.lam 2020-06-17 20:09:00 -0700 Comment on attachment 402164 proposed patch. View in context: https://bugs.webkit.org/attachment.cgi?id=402164&action=review Thanks. >> Source/JavaScriptCore/ChangeLog:98 >> + there is n the location of m_cellSize. It is now moved up next to m_remaining, > > typo: "n" ? I think I meant to say "in". >> Source/JavaScriptCore/heap/FreeList.h:108 >> + // if there atoms still available for allocation. See comment blob below > > typo: "there atoms" => "there are atoms" Will fix. >> Source/JavaScriptCore/heap/FreeList.h:119 >> + static ptrdiff_t offsetOfBitmapRows() { return OBJECT_OFFSETOF(FreeList, m_bitmap) - sizeof(AtomsBitmap::Word); } > > Maybe rename to offsetOfBitmapRowsMinusOne, or offsetOneBeforeBitmapRows, or something like this? Just in case anyone tries to use it without looking at where it is defined. offsetOfBitmapRowsMinusOne sounds good. I'll try to apply this in my follow up patch to address Fil's idea for an optimization. >> Source/JavaScriptCore/heap/FreeListInlines.h:100 >> + while (rowBitmap) { > > It probably does not matter, but I can think of a way to make this loop a tad more efficient: > ``` > unsigned atomIndexInRow = 0; > while (rowBitmap) { > atomIndexInRow += ctz(rowBitmap); > auto* cell = bitwise_cast<HeapCell*>(&currentMarkedBlockRowAddress[atomIndexInRow]); > rowBitmap >>= (++atomIndexInRow); > func(cell); > } > ``` I don't see how this can work. Let's go over an example: say we have bits at index 2, 3, and 5. rowBitmap is ...0000101100b. 1st iteration: atomIndexInRow is 0, and becomes 2. We compute the cell to be &currentMarkedBlockRowAddress[2]. All is well. atomIndexInRow becomes 3. rowBitmap becomes ...0000101b. 2nd iteration: atomIndexInRow is 3, and stays 3. We compute the cell to be &currentMarkedBlockRowAddress[3]. All is well. atomIndexInRow becomes 4. rowBitmap becomes ...000b. 3rd iteration should have computed cell at &currentMarkedBlockRowAddress[5], but actually thinks there is no cells left because rowBitmap has become 0. The bug lies in the right shift on rowBitmap. I think it needs to be shifted by the result of the ctz + 1, not atomIndexInRow + 1. And yeah, I'm not sure this is worth it. The code will definitely be trickier and harder to understand, and therefore error prone. >> Source/JavaScriptCore/jit/AssemblyHelpers.cpp:561 >> +#if CPU(ARM64) > > I am a bit wary that this code will never be tested since BITMAP_FREELIST is currently only set on x86_64. I don't have a better solution though. > It is also a bit weird to have both "#if CPU(ARM64)" and "if (isARM64())", but just "if (isx86_64())". What is the criterion for picking one of these ways of checking the CPU? It's unfortunate but the #if CPU(ARM64) is needed because getCachedMemoryTempRegisterIDAndInvalidate() is only available for ARM64. We'll be testing this code when we try to turn this on for ARM64 later after we try to do more to improve perf. 1663800 13 402164 saam 2020-06-17 22:30:14 -0700 Comment on attachment 402164 proposed patch. View in context: https://bugs.webkit.org/attachment.cgi?id=402164&action=review LGTM too > Source/JavaScriptCore/ChangeLog:87 > + The middle path checks m_currentRowIndex to see if we have more rows to allocate > + from. For each m_currentRowIndex, we check its corresponding AtomsBitmap::Word > + in m_bitmap. If the word is non-zero, we copy it to m_currentRowBitmap and > + jump to the fast path to do the allocation. The middle path will update > + m_currentRowIndex to point to the current row we're allocating from. I think it'd be faster if m_currentRowIndex were instead a bitmap itself telling you the next row to allocate out of was. Might matter for blocks with larger cell sizes. > Source/JavaScriptCore/heap/FreeList.cpp:137 > + return m_currentRowBitmap & (one << atomIndexInRow); using the constant 1 is more readable imo > Source/JavaScriptCore/heap/FreeListInlines.h:51 > + rowBitmap &= ~(one << atomIndexInRow); nit: I think it's easier to read with the constant 1 than the name "one" > Source/JavaScriptCore/heap/MarkedBlockInlines.h:322 > + auto handleDeadCell = [&] (size_t i) { > + HeapCell* cell = reinterpret_cast_ptr<HeapCell*>(atomAt(i)); > + > + if (destructionMode != BlockHasNoDestructors) > + destroy(cell); > + > + if (sweepMode == SweepToFreeList) { > + if (scribbleMode == Scribble) > + scribble(cell, cellSize); > + ++count; > + } > + }; It'd be a lot easier to read if this just were inline where you used it. Anyways, you check destructionMode twice 1663802 14 402164 saam 2020-06-17 22:31:34 -0700 Comment on attachment 402164 proposed patch. View in context: https://bugs.webkit.org/attachment.cgi?id=402164&action=review > Source/JavaScriptCore/ChangeLog:12 > + 2 loads - m_currentRowBitmap, m_currentMarkedBlockRowAddress on arm64 we can should turn this into a single loadpair 1663812 15 402164 mark.lam 2020-06-17 23:50:33 -0700 Comment on attachment 402164 proposed patch. View in context: https://bugs.webkit.org/attachment.cgi?id=402164&action=review >> Source/JavaScriptCore/ChangeLog:12 >> + 2 loads - m_currentRowBitmap, m_currentMarkedBlockRowAddress > > on arm64 we can should turn this into a single loadpair I can experiment with this to see if it's worth it. It impacts the layout of the fields. I think our cache line should be large enough that it doesn't matter, but I'll need to test it to be sure. >> Source/JavaScriptCore/ChangeLog:87 >> + m_currentRowIndex to point to the current row we're allocating from. > > I think it'd be faster if m_currentRowIndex were instead a bitmap itself telling you the next row to allocate out of was. Might matter for blocks with larger cell sizes. This is an intriguing idea. I'll give it a try. >> Source/JavaScriptCore/heap/FreeList.cpp:137 >> + return m_currentRowBitmap & (one << atomIndexInRow); > > using the constant 1 is more readable imo It is necessary to use "one" here because the alternative would be to use static_cast<AtomsBitmap::Word>(1). It is incorrect to just use literal 1 because literal 1 is of type int, and this shift will never produce a 64-bit value if we use that (which has been a source of bugs). We don't use 1ull either because technically, AtomsBitmap::Word can be 32-bits eventually if 32-bit ports adopts BITMAP_FREELIST. Using "one" is the portable and always correct solution here. >> Source/JavaScriptCore/heap/MarkedBlockInlines.h:322 >> + }; > > It'd be a lot easier to read if this just were inline where you used it. > > Anyways, you check destructionMode twice This is a carry over from the linked list implementation that calls handleDeadCell in 2 places. For the bitmap implementation, we only need to call it in one place. I'll move it to the call site. As for the redundant destructionMode check, you found a bug! handleDeadCell should be called unconditionally. The bug here is that: 1. we won't scribble dead cells if the cell does not have a destructor. 2. we won't count the dead cell. This results in FreeList::originalSize() always returning 0, which leads to a 0 being wrongly reported to Heap::didAllocate(). 1678957 16 commit-queue 2020-08-09 02:07:00 -0700 Re-opened since this is blocked by bug 215312 401630 2020-06-11 02:20:26 -0700 2020-06-11 02:29:33 -0700 work in progress. bug-213071.patch text/plain 34097 mark.lam SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9mdGwvRlRMTG93ZXJERkdUb0IzLmNwcAo9PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09Ci0tLSBTb3VyY2UvSmF2YVNjcmlwdENvcmUvZnRsL0ZUTExvd2VyREZHVG9CMy5jcHAJ KHJldmlzaW9uIDI2Mjg4OCkKKysrIFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9mdGwvRlRMTG93ZXJE RkdUb0IzLmNwcAkod29ya2luZyBjb3B5KQpAQCAtMTUwNTEsNyArMTUwNTEsNyBAQCBwcml2YXRl OgogICAgICAgICAgICAgcGF0Y2hwb2ludC0+bnVtR1BTY3JhdGNoUmVnaXN0ZXJzKys7CiAgICAg ICAgIGVsc2UKICAgICAgICAgICAgIHBhdGNocG9pbnQtPmFwcGVuZFNvbWVSZWdpc3RlcldpdGhD bG9iYmVyKGFsbG9jYXRvcik7Ci0gICAgICAgIHBhdGNocG9pbnQtPm51bUdQU2NyYXRjaFJlZ2lz 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-0700 2020-06-17 16:12:07 -0700 proposed patch. bug-213071.patch text/plain 46306 mark.lam SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMjYzMTgxKQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDE0OSBA QAorMjAyMC0wNi0xNyAgTWFyayBMYW0gIDxtYXJrLmxhbUBhcHBsZS5jb20+CisKKyAgICAgICAg UmVwbGFjZSBKU0M6OkZyZWVMaXN0IGxpbmtlZCBsaXN0IHdpdGggYSBCaXRtYXAuCisgICAgICAg IGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9pZD0yMTMwNzEKKworICAgICAg ICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4KKworICAgICAgICBJbXBsZW1lbnQgYW4gYWx0 ZXJuYXRpdmUgdG8gdGhlIGxpbmtlZCBsaXN0IEZyZWVMaXN0LiAgVGhpcyBhbHRlcm5hdGl2ZSB1 c2VzCisgICAgICAgIGEgQml0bWFwIHRvIHJlY29yZCB3aGljaCBhdG9tIGluIHRoZSBibG9jayBp cyBhdmFpbGFibGUgZm9yIGFsbG9jYXRpb24uCisKKyAgICAgICAgVGhlIGludHVpdGlvbiBoZXJl 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