Attachment 339912 Details for Bug 185441 – patch for landing

[patch] patch for landing

a-backup.diff (text/plain), 11.66 KB, created by Saam Barati on 2018-05-08 18:59:52 PDT

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Creator: Saam Barati

Created: 2018-05-08 18:59:52 PDT

Size: 11.66 KB

patch

obsolete

>Index: Source/JavaScriptCore/ChangeLog
>===================================================================
>--- Source/JavaScriptCore/ChangeLog	(revision 231512)
>+++ Source/JavaScriptCore/ChangeLog	(working copy)
>@@ -1,3 +1,27 @@
>+2018-05-08  Saam Barati  <sbarati@apple.com>
>+
>+        Add JSVirtualMachine SPI to shrink the memory footprint of the VM
>+        https://bugs.webkit.org/show_bug.cgi?id=185441
>+        <rdar://problem/39999414>
>+
>+        Reviewed by Keith Miller.
>+
>+        This patch adds JSVirtualMachine SPI to release as much memory as possible.
>+        The SPI does:
>+        - Deletes all code caches.
>+        - Synchronous GC.
>+        - Run the scavenger.
>+
>+        * API/JSVirtualMachine.mm:
>+        (-[JSVirtualMachine shrinkFootprint]):
>+        * API/JSVirtualMachinePrivate.h: Added.
>+        * API/tests/testapi.mm:
>+        (testObjectiveCAPIMain):
>+        * JavaScriptCore.xcodeproj/project.pbxproj:
>+        * runtime/VM.cpp:
>+        (JSC::VM::shrinkFootprint):
>+        * runtime/VM.h:
>+
> 2018-05-08  Ryan Haddad  <ryanhaddad@apple.com>
> 
>         Unreviewed, rolling out r231468.
>Index: Source/JavaScriptCore/API/JSVirtualMachine.mm
>===================================================================
>--- Source/JavaScriptCore/API/JSVirtualMachine.mm	(revision 231496)
>+++ Source/JavaScriptCore/API/JSVirtualMachine.mm	(working copy)
>@@ -268,6 +268,13 @@ - (NSMapTable *)externalRememberedSet
>     return m_externalRememberedSet;
> }
> 
>+- (void)shrinkFootprint
>+{
>+    JSC::VM* vm = toJS(m_group);
>+    JSC::JSLockHolder locker(vm);
>+    vm->shrinkFootprint();
>+}
>+
> @end
> 
> static void scanExternalObjectGraph(JSC::VM& vm, JSC::SlotVisitor& visitor, void* root, bool lockAcquired)
>Index: Source/JavaScriptCore/API/JSVirtualMachinePrivate.h
>===================================================================
>--- Source/JavaScriptCore/API/JSVirtualMachinePrivate.h	(nonexistent)
>+++ Source/JavaScriptCore/API/JSVirtualMachinePrivate.h	(working copy)
>@@ -0,0 +1,45 @@
>+/*
>+ * Copyright (C) 2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#include <JavaScriptCore/JavaScript.h>
>+
>+#if JSC_OBJC_API_ENABLED
>+
>+#import <JavaScriptCore/JSVirtualMachine.h>
>+
>+@interface JSVirtualMachine(JSPrivate)
>+
>+/*!
>+@method
>+@discussion Shrinks the memory footprint of the VM by deleting various internal caches,
>+ running synchronous garbage collection, and releasing memory back to the OS. For this
>+ to free as much memory as possible, do not call this when JavaScript is running on the stack.
>+*/
>+
>+- (void)shrinkFootprint; // FIXME: Annotate this with NS_AVAILABLE: <rdar://problem/40071332>.
>+
>+@end
>+
>+#endif // JSC_OBJC_API_ENABLED
>Index: Source/JavaScriptCore/API/tests/testapi.mm
>===================================================================
>--- Source/JavaScriptCore/API/tests/testapi.mm	(revision 231496)
>+++ Source/JavaScriptCore/API/tests/testapi.mm	(working copy)
>@@ -28,11 +28,14 @@
> #import "CurrentThisInsideBlockGetterTest.h"
> #import "DateTests.h"
> #import "JSExportTests.h"
>+#import "JSVirtualMachinePrivate.h"
> #import "Regress141275.h"
> #import "Regress141809.h"
> 
> #import <pthread.h>
> #import <vector>
>+#import <wtf/MemoryFootprint.h>
>+#import <wtf/Optional.h>
> 
> extern "C" void JSSynchronousGarbageCollectForDebugging(JSContextRef);
> extern "C" void JSSynchronousEdenCollectForDebugging(JSContextRef);
>@@ -1469,6 +1472,33 @@ static void testObjectiveCAPIMain()
>         checkResult(@"Ran code in five concurrent VMs that GC'd", ok);
>     }
> 
>+    @autoreleasepool {
>+        JSContext *context = [[JSContext alloc] init];
>+        JSVirtualMachine *vm = [context virtualMachine];
>+        [vm shrinkFootprint]; // Make sure that when we allocate a ton of memory below we reuse at little as possible.
>+
>+        std::optional<size_t> footprintBefore = WTF::memoryFootprint();
>+        RELEASE_ASSERT(footprintBefore);
>+
>+        [context evaluateScript:@"for (let i = 0; i < 10000; ++i) { eval(`myVariable_${i} = [i]`); }"];
>+
>+        static constexpr size_t approximateBytes = 10000 * sizeof(int);
>+        std::optional<size_t> footprintMiddle = WTF::memoryFootprint();
>+        RELEASE_ASSERT(footprintMiddle);
>+        checkResult(@"Footprint is larger than what we allocated", *footprintMiddle > approximateBytes);
>+        checkResult(@"Footprint got larger as we allocated a ton of stuff", *footprintMiddle > *footprintBefore);
>+        size_t allocationDelta = *footprintMiddle - *footprintBefore;
>+        checkResult(@"We allocated as much or more memory than what we expected to", allocationDelta >= approximateBytes);
>+
>+        [context evaluateScript:@"for (let i = 0; i < 10000; ++i) { eval(`myVariable_${i} = null`); }"];
>+        [vm shrinkFootprint];
>+        std::optional<size_t> footprintAfter = WTF::memoryFootprint();
>+        RELEASE_ASSERT(footprintAfter);
>+        checkResult(@"Footprint got smaller after we shrank the VM", *footprintAfter < *footprintMiddle);
>+        size_t freeDelta = *footprintMiddle - *footprintAfter;
>+        checkResult(@"Shrinking the footprint of the VM actually freed memory", freeDelta > (approximateBytes / 2));
>+    }
>+
>     currentThisInsideBlockGetterTest();
>     runDateTests();
>     runJSExportTests();
>Index: Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj
>===================================================================
>--- Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj	(revision 231496)
>+++ Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj	(working copy)
>@@ -1100,6 +1100,7 @@
> 		7919B7801E03559C005BEED8 /* B3Compile.h in Headers */ = {isa = PBXBuildFile; fileRef = 7919B77F1E03559C005BEED8 /* B3Compile.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		79233C2B1D34715700C5A834 /* JITMathIC.h in Headers */ = {isa = PBXBuildFile; fileRef = 79233C291D34715700C5A834 /* JITMathIC.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		792CB34A1C4EED5C00D13AF3 /* PCToCodeOriginMap.h in Headers */ = {isa = PBXBuildFile; fileRef = 792CB3481C4EED5C00D13AF3 /* PCToCodeOriginMap.h */; settings = {ATTRIBUTES = (Private, ); }; };
>+		795AC61820A2355E0052C76C /* JSVirtualMachinePrivate.h in Headers */ = {isa = PBXBuildFile; fileRef = 795AC61720A2354B0052C76C /* JSVirtualMachinePrivate.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		7964656A1B952FF0003059EE /* GetPutInfo.h in Headers */ = {isa = PBXBuildFile; fileRef = 796465681B952FF0003059EE /* GetPutInfo.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		7965C2171E5D799600B7591D /* AirAllocateRegistersByGraphColoring.h in Headers */ = {isa = PBXBuildFile; fileRef = 7965C2151E5D799600B7591D /* AirAllocateRegistersByGraphColoring.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		796DAA2B1E89CCD6005DF24A /* CalleeBits.h in Headers */ = {isa = PBXBuildFile; fileRef = 796DAA2A1E89CCD6005DF24A /* CalleeBits.h */; settings = {ATTRIBUTES = (Private, ); }; };
>@@ -3615,6 +3616,7 @@
> 		79233C291D34715700C5A834 /* JITMathIC.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = JITMathIC.h; sourceTree = "<group>"; };
> 		792CB3471C4EED5C00D13AF3 /* PCToCodeOriginMap.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = PCToCodeOriginMap.cpp; sourceTree = "<group>"; };
> 		792CB3481C4EED5C00D13AF3 /* PCToCodeOriginMap.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = PCToCodeOriginMap.h; sourceTree = "<group>"; };
>+		795AC61720A2354B0052C76C /* JSVirtualMachinePrivate.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = JSVirtualMachinePrivate.h; sourceTree = "<group>"; };
> 		795F099C1E03600500BBE37F /* B3Compile.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = B3Compile.cpp; path = b3/B3Compile.cpp; sourceTree = "<group>"; };
> 		796465681B952FF0003059EE /* GetPutInfo.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = GetPutInfo.h; sourceTree = "<group>"; };
> 		7965C2141E5D799600B7591D /* AirAllocateRegistersByGraphColoring.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = AirAllocateRegistersByGraphColoring.cpp; path = b3/air/AirAllocateRegistersByGraphColoring.cpp; sourceTree = "<group>"; };
>@@ -5854,6 +5856,7 @@
> 				14BD5A2B0A3E91F600BAF59C /* JSValueRef.cpp */,
> 				1482B6EA0A4300B300517CFC /* JSValueRef.h */,
> 				86E3C60F167BAB87006D760A /* JSVirtualMachine.h */,
>+				795AC61720A2354B0052C76C /* JSVirtualMachinePrivate.h */,
> 				86E3C610167BAB87006D760A /* JSVirtualMachine.mm */,
> 				86E3C611167BAB87006D760A /* JSVirtualMachineInternal.h */,
> 				A7482E37116A697B003B0712 /* JSWeakObjectMapRefInternal.h */,
>@@ -8609,6 +8612,7 @@
> 				0FFB921C16D02F110055A5DB /* DFGOSRExitCompilationInfo.h in Headers */,
> 				0F7025AA1714B0FC00382C0E /* DFGOSRExitCompilerCommon.h in Headers */,
> 				0F392C8A1B46188400844728 /* DFGOSRExitFuzz.h in Headers */,
>+				795AC61820A2355E0052C76C /* JSVirtualMachinePrivate.h in Headers */,
> 				0FEFC9AB1681A3B600567F53 /* DFGOSRExitJumpPlaceholder.h in Headers */,
> 				0F235BEE17178E7300690C7F /* DFGOSRExitPreparation.h in Headers */,
> 				0F6237981AE45CA700D402EA /* DFGPhantomInsertionPhase.h in Headers */,
>Index: Source/JavaScriptCore/runtime/VM.cpp
>===================================================================
>--- Source/JavaScriptCore/runtime/VM.cpp	(revision 231496)
>+++ Source/JavaScriptCore/runtime/VM.cpp	(working copy)
>@@ -771,6 +771,16 @@ void VM::deleteAllCode(DeleteAllCodeEffo
>     });
> }
> 
>+void VM::shrinkFootprint()
>+{
>+    sanitizeStackForVM(this);
>+    deleteAllCode(DeleteAllCodeIfNotCollecting);
>+    heap.collectSync();
>+    WTF::releaseFastMallocFreeMemory();
>+    // FIXME: Consider stopping various automatic threads here.
>+    // https://bugs.webkit.org/show_bug.cgi?id=185447
>+}
>+
> SourceProviderCache* VM::addSourceProviderCache(SourceProvider* sourceProvider)
> {
>     auto addResult = sourceProviderCacheMap.add(sourceProvider, nullptr);
>Index: Source/JavaScriptCore/runtime/VM.h
>===================================================================
>--- Source/JavaScriptCore/runtime/VM.h	(revision 231496)
>+++ Source/JavaScriptCore/runtime/VM.h	(working copy)
>@@ -746,6 +746,8 @@ public:
>     JS_EXPORT_PRIVATE void deleteAllCode(DeleteAllCodeEffort);
>     JS_EXPORT_PRIVATE void deleteAllLinkedCode(DeleteAllCodeEffort);
> 
>+    void shrinkFootprint();
>+
>     WatchpointSet* ensureWatchpointSetForImpureProperty(const Identifier&);
>     void registerWatchpointForImpureProperty(const Identifier&, Watchpoint*);
>

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Attachments on bug 185441: 339881 | 339884 | 339912 | 339968