200807 2019-08-15 23:18:28 -0700 [JSC] WebAssembly BBQ should switch compile mode for size of modules 2020-01-15 17:39:19 -0800 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=200686 InRadar P2 Normal --- 1 ysuzuki ysuzuki evan.exe ews-watchlist keith_miller mark.lam msaboff saam sam tzagallo walter webkit-bug-importer oldest_to_newest 1561941 0 ysuzuki 2019-08-15 23:18:28 -0700 On ARM devices, our fixed executable memory size is only 128MB, and it cannot be expanded further since 128MB is the maximum value of relative jump in ARM. As a result, some of Wasm apps exhaust executable memory. Wasm interpreter should be a long term solution. As a short term solution, we should have heuristics that switches compiler mode in BBQ: BBQ Air bloats simple code which takes much executable memory. Use BBQ B3 instead for significantly large wasm code on executable-memory-limited environments. 1561942 1 ysuzuki 2019-08-15 23:19:34 -0700 <rdar://problem/54275409> 1561998 2 376488 ysuzuki 2019-08-16 02:49:04 -0700 Created attachment 376488 Patch 1562040 3 376488 mark.lam 2019-08-16 08:39:42 -0700 Comment on attachment 376488 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=376488&action=review r=me > Source/JavaScriptCore/ChangeLog:10 > + the sacrifice of start-up time, since BBQ Air bloats so lengthy code consuming large amount of executable memory. I suggest /bloats so lengthy code consuming large/bloats such lengthy code, and thereby consumes a large/. > Source/JavaScriptCore/runtime/Options.h:495 > + v(size, webAssemblyBBQAirModeThreshold, isIOS() ? (10 << 20) : 0, Normal, "If 0, we always use BBQ Air. If Wasm module code size hits this threshold, we compile Wasm module with B3 BBQ mode.") \ I suggest using 10 * MB instead. > Source/JavaScriptCore/wasm/WasmBBQPlan.cpp:144 > + // FIXME: Some webpages use very large Wasm module, and it exhausts all executable memory in ARM64 devices since the size of executable memory region is 128MB. /is 128MB/is only limited to 128MB/. > Source/JavaScriptCore/wasm/WasmBBQPlan.cpp:145 > + // The long term solution should be introducing Wasm interpreter. But as a short term solution, we introduce heuristics switching back to BBQ B3 at the sacrifice of start-up time, /should be introducing Wasm interpreter/should be to introduce a Wasm interpreter/. /heuristics switching back/heuristics to switch back/. > Source/JavaScriptCore/wasm/WasmBBQPlan.cpp:146 > + // since BBQ Air bloats so lengthy code consuming large amount of executable memory. I suggest rephrasing as “as BBQ Air bloats such lengthy Wasm code and will consume a large ...” 1562341 4 ysuzuki 2019-08-16 18:03:15 -0700 Ah, oops. I need to change the fallback code to module information collecting part. 1562353 5 376574 ysuzuki 2019-08-16 18:57:52 -0700 Created attachment 376574 Patch 1562379 6 376574 sam 2019-08-16 20:10:22 -0700 Comment on attachment 376574 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=376574&action=review > Source/JavaScriptCore/ChangeLog:12 > + Currently, I picked 10MB since the reported website is using 11MB wasm module. Since the amount of memory on iOS devices is likely to change over time, can this be made in terms of some runtime signal? 1562395 7 376574 ysuzuki 2019-08-16 20:59:09 -0700 Comment on attachment 376574 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=376574&action=review >> Source/JavaScriptCore/ChangeLog:12 >> + Currently, I picked 10MB since the reported website is using 11MB wasm module. > > Since the amount of memory on iOS devices is likely to change over time, can this be made in terms of some runtime signal? The problem is that we are exhausting executable-memory, not usual memory. In our JIT executable memory allocator, we allocate fixed-sized executable memory, and use it for JIT functions. The size of this fixed-sized executable-memory region is the same in all the iOS devices, 128MB. And this size is not related to device's memory size. This is related to ARM64 instruction sets. We cannot extend it further for now, since this 128MB size is derived from the maximum-relative-jump-offset in ARM64 instruction set. In JSC, right now, we are assuming that any JIT code can be reachable from the other JIT code with relative-offset-jump. Since ARM64's relative-offset-jump is +- 128MB, this 128MB executable memory region is the maximum size in the current design. 1562527 8 376574 mark.lam 2019-08-17 17:43:53 -0700 Comment on attachment 376574 Patch r=me 1562542 9 ysuzuki 2019-08-17 18:46:35 -0700 (In reply to Mark Lam from comment #8) > Comment on attachment 376574 [details] > Patch > > r=me Thanks, landing. 1562543 10 ysuzuki 2019-08-17 18:48:03 -0700 Committed r248824: <https://trac.webkit.org/changeset/248824> 1562945 11 376574 saam 2019-08-19 22:13:26 -0700 Comment on attachment 376574 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=376574&action=review > Source/JavaScriptCore/wasm/WasmBBQPlan.cpp:273 > + // FIXME: Some webpages use very large Wasm module, and it exhausts all executable memory in ARM64 devices since the size of executable memory region is only limited to 128MB. what web pages? Also, this falls down if you compile many modules, instead of one big module. This doesn't feel like a very robust solution to this problem. 1562975 12 376574 ysuzuki 2019-08-20 00:16:03 -0700 Comment on attachment 376574 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=376574&action=review >> Source/JavaScriptCore/wasm/WasmBBQPlan.cpp:273 >> + // FIXME: Some webpages use very large Wasm module, and it exhausts all executable memory in ARM64 devices since the size of executable memory region is only limited to 128MB. > > what web pages? > > Also, this falls down if you compile many modules, instead of one big module. This doesn't feel like a very robust solution to this problem. The radar includes the information about this page. This fix is not aiming at being the robust solution as described in this FIXME. This is short term solution until Wasm interpreter is introduced. The motivation behind this fix is, it is better than having some pages working rather than completely not-working. 1567628 13 ap 2019-09-03 20:40:44 -0700 *** Bug 200686 has been marked as a duplicate of this bug. *** 1572191 14 walter 2019-09-18 19:15:31 -0700 Hello, Thanks for resolving this issue so quickly! I was wondering if you guys knew ballpark when this patch will land in iOS. I’m assuming it’s too late for 13.0 since the regression still occurs for me in 13.1 beta 4. I don’t mean that as a complaint! But I’m trying to get an appreciation for which versions of iOS we should be blocking for end users. Thanks again for the help! 1572375 15 keith_miller 2019-09-19 09:11:40 -0700 (In reply to Walter Stumpf from comment #14) > Hello, > > Thanks for resolving this issue so quickly! I was wondering if you guys > knew ballpark when this patch will land in iOS. I’m assuming it’s too late > for 13.0 since the regression still occurs for me in 13.1 beta 4. I don’t > mean that as a complaint! But I’m trying to get an appreciation for which > versions of iOS we should be blocking for end users. Thanks again for the > help! Hi Walter, First, sorry about the regression. Unfortunately, Apple has a policy of not commenting on future product releases, however, so we can't give a definitive timeline. 1572421 16 walter 2019-09-19 11:41:26 -0700 No problem, I completely understand. We greatly appreciate the webkit team even working around the problem for us in the first place! I will continue to cross my fingers when installing new iOS betas in the meantime! :) 1576098 17 walter 2019-10-02 12:00:31 -0700 Hey just wanted to confirm iOS 13.2 beta resolves the issue for us! 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