144104 2015-04-23 10:00:10 -0700 Memory cache live resources repeatedly purged during painting 2015-04-24 11:02:01 -0700 1 1 1 Unclassified WebKit Page Loading 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 144121 1 koivisto webkit-unassigned bfulgham cdumez commit-queue japhet simon.fraser oldest_to_newest 1087859 0 koivisto 2015-04-23 10:00:10 -0700 On some PLT pages (like nytimes.com) we get into state where painting repeatedly purges live bitmaps. This slows down page loads significantly.     13 WebCore::BitmapImage::draw(WebCore::GraphicsContext*, WebCore::FloatRect const&, endMode, WebCore::ImageOrientationDescription)  (in WebCore) + 447  [0x127c727]       13 WebCore::MemoryCache::pruneLiveResourcesToSize(unsigned int, bool)  (in WebCore) + 251           13 WebCore::BitmapImage::destroyDecodedData(bool)  (in WebCore) + 191  [0x127acfb]           6 WebCore::ImageSource::clear(bool, unsigned long, WebCore::SharedBuffer*, bool)  (in WebCore) + 39             | 6 CGImageSourceCreateIncremental  (in ImageIO) + 199  [0x250e98bb]           |   2 _CGImageSourceCreate  (in ImageIO) + 61  [0x250abd79]           |   + 1 CFAllocatorAllocate  (in CoreFoundation) + 95  [0x23fdea53]           |   + 1 _CFRuntimeCreateInstance  (in CoreFoundation) + 289  [0x23fdec51]           |   +   1 malloc_zone_malloc  (in libsystem_malloc.dylib) + 87  [0x32ae6da7]           |   +     1 szone_malloc_should_clear  (in libsystem_malloc.dylib) + 61  [0x32ae6e19]           |   2 _CGImageSourceCreate  (in ImageIO) + 41  [0x250abd65]           |   1 _CGImageSourceCreate  (in ImageIO) + 157  [0x250abdd9]           |   + 1 _pthread_mutex_init  (in libsystem_pthread.dylib) + 3  [0x32b3cadf]           |   1 _CGImageSourceCreate  (in ImageIO) + 227  [0x250abe1f]           |     1 CFSetCreateMutable  (in CoreFoundation) + 93  [0x23fefa75]           |       1 CFBasicHashCreate  (in CoreFoundation) + 116  [0x23fdf594]           |         1 _CFRuntimeCreateInstance  (in CoreFoundation) + 289  [0x23fdec51]           |           1 malloc_zone_malloc  (in libsystem_malloc.dylib) + 87  [0x32ae6da7]           |             1 szone_malloc_should_clear  (in libsystem_malloc.dylib) + 219  [0x32ae6eb7]           |               1 tiny_malloc_from_free_list  (in libsystem_malloc.dylib) + 181  [0x32ae80b5]           3 WebCore::ImageSource::clear(bool, unsigned long, WebCore::SharedBuffer*, bool)  (in WebCore) + 23             | 2 CFRelease  (in CoreFoundation) + 493  [0x23fe4de1]           | + 2 _CGImageSourceFinalize  (in ImageIO) + 79  [0x250b6967]           | +   2 CFRelease  (in CoreFoundation) + 493  [0x23fe4de1]           | +     2 _CGImageReadFinalize  (in ImageIO) + 433  [0x250cd985]           | +       2 CFRelease  (in CoreFoundation) + 597  [0x23fe4e49]           | +         2 objc_object::sidetable_release(bool)  (in libobjc.A.dylib) + 163  [0x32483d5b]           | +           1 -[WebCoreSharedBufferData dealloc]  (in WebCore) + 39  [0x1b54b3f]           | +           ! 1 WebCoreObjCScheduleDeallocateOnMainThread(objc_class*, objc_object*)  (in WebCore) +           | +           !   1 _Unwind_SjLj_Register  (in libunwind.dylib) + 5  [0x32b4fae5]           | +           1 -[WebCoreSharedBufferData dealloc]  (in WebCore) + 75  [0x1b54b63]           | +             1 object_dispose  (in libobjc.A.dylib) + 11  [0x32472617]           | +               1 objc_destructInstance  (in libobjc.A.dylib) + 31  [0x324725f3]           | +                 1 object_cxxDestructFromClass(objc_object*, objc_class*)  (in libobjc.A.dylib) + 115             | +                   1 -[WebCoreSharedBufferData .cxx_destruct]  (in WebCore) + 37  [0x1b54c81]           | 1 CFRelease  (in CoreFoundation) + 1253  [0x23fe50d9]           |   1 _os_lock_handoff_lock  (in libsystem_platform.dylib) + 35  [0x32b38473]           3 WebCore::ImageSource::clear(bool, unsigned long, WebCore::SharedBuffer*, bool)  (in WebCore) + 51             | 1 WebCore::SharedBuffer::createCFData()  (in WebCore) + 147  [0x1b54edf]           | + 1 NSAllocateObject  (in Foundation) + 101  [0x24d50b55]           | 1 WebCore::SharedBuffer::createCFData()  (in WebCore) + 203  [0x1b54f17]           | + 1 _os_lock_handoff_trylock  (in libsystem_platform.dylib) + 35  [0x32b383cf]           | 1 WebCore::SharedBuffer::createCFData()  (in WebCore) + 9  [0x1b54e55]           1 WebCore::ImageSource::clear(bool, unsigned long, WebCore::SharedBuffer*, bool)  (in WebCore) + 61               1 CGImageSourceUpdateData  (in ImageIO) + 893  [0x250e9c59]               1 CGImageReadCreateWithData  (in ImageIO) + 43  [0x250abb93]                 1 CFDataGetLength  (in CoreFoundation) + 3  [0x23fdf273] 1087860 1 koivisto 2015-04-23 10:01:01 -0700 <rdar://problem/20667695> 1087863 2 251451 koivisto 2015-04-23 10:12:30 -0700 Created attachment 251451 patch 1087870 3 251451 cdumez 2015-04-23 10:22:52 -0700 Comment on attachment 251451 patch View in context: https://bugs.webkit.org/attachment.cgi?id=251451&action=review r=me > Source/WebCore/ChangeLog:25 > + Decrease the pruning size targer from 0.95 to 0.8 so we don't need to prune so often. "target" 1087883 4 koivisto 2015-04-23 10:51:03 -0700 https://trac.webkit.org/r183194 1087928 5 bfulgham 2015-04-23 12:32:57 -0700 I'm afraid we have some new Windows crashes with this patch. I'll try to get a stack trace for you ASAP. 1087937 6 ap 2015-04-23 12:36:18 -0700 This also broke http/tests/cache/disk-cache/disk-cache-disable.html on Mac. 1087949 7 koivisto 2015-04-23 13:00:49 -0700 Specifically it seems to have become flaky. https://build.webkit.org/results/Apple%20Yosemite%20Debug%20WK2%20(Tests)/r183196%20(3707)/results.html I'll see what is going on. 1087974 8 ap 2015-04-23 13:35:42 -0700 Looks like this may have broken more tests, namely http/tests/ssl/referer-301.html and http/tests/ssl/referer-303.html https://build.webkit.org/results/Apple%20Yosemite%20Release%20WK2%20(Tests)/r183202%20(4649)/results.html Antti, are you still looking into this? I need to roll out the patch, as it's way more flakiness than we can live with. 1087995 9 commit-queue 2015-04-23 14:12:48 -0700 Re-opened since this is blocked by bug 144121 1088092 10 ap 2015-04-23 16:27:17 -0700 Turns out that http/tests/ssl/referer-301.html and http/tests/ssl/referer-303.html failures were not caused by this. Trying to find the culprit. It may be an issue with Xcode dependency tracking, will try a clean build. 1088097 11 ap 2015-04-23 16:49:36 -0700 The rollout did fix http/tests/cache/disk-cache/disk-cache-disable.html on Mac, and it did fix Windows crashes. 1088201 12 koivisto 2015-04-24 01:28:33 -0700 Where are the crash stacks for Windows? The most likely cause is that the implementation of RunLoop::main().dispatch() is buggy (this looks like the first WebCore client for it that would run on Windows). 1088212 13 koivisto 2015-04-24 04:26:15 -0700 Relanded in https://trac.webkit.org/r183261 Fixed the test case and switched to Timer for now. 1088262 14 ap 2015-04-24 11:02:01 -0700 Everything looks good now! 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