Bug 126737 – Clear unparented tiled layers on memory pressure.

• Component: WebKit Misc.
• Status: RESOLVED FIXED

[Yongjun Zhang]

TileController hold unparented for a short period of time (1 -3 sec); we should clear these unparented tiles immediately if we are under memory pressure.

[Yongjun Zhang]

<rdar://problem/15715238>

[Yongjun Zhang]

Created attachment 220809 [details]
Patch, immediately clear unparented tiles under memory pressure.

[WebKit Commit Bot]

Attachment 220809 [details] did not pass style-queue:

Failed to run "['Tools/Scripts/check-webkit-style', '--diff-files', u'Source/WebCore/ChangeLog', u'Source/WebCore/WebCore.exp.in', u'Source/WebCore/WebCore.xcodeproj/project.pbxproj', u'Source/WebCore/platform/graphics/ca/GraphicsLayerCA.cpp', u'Source/WebCore/platform/graphics/ca/mac/TileController.h', u'Source/WebCore/platform/graphics/ca/mac/TileController.mm', u'Source/WebCore/platform/ios/TileControllerMemoryHandlerIOS.cpp', u'Source/WebCore/platform/ios/TileControllerMemoryHandlerIOS.h', u'Source/WebKit/mac/ChangeLog', u'Source/WebKit/mac/WebView/WebView.mm', '--commit-queue']" exit_code: 1
ERROR: Source/WebCore/platform/ios/TileControllerMemoryHandlerIOS.h:26:  #ifndef header guard has wrong style, please use: TileControllerMemoryHandlerIOS_h  [build/header_guard] [5]
ERROR: Source/WebCore/platform/ios/TileControllerMemoryHandlerIOS.h:39:  The parameter name "controller" adds no information, so it should be removed.  [readability/parameter_name] [5]
ERROR: Source/WebCore/platform/ios/TileControllerMemoryHandlerIOS.h:40:  The parameter name "controller" adds no information, so it should be removed.  [readability/parameter_name] [5]
ERROR: Source/WebCore/platform/ios/TileControllerMemoryHandlerIOS.h:44:  Missing space inside { }.  [whitespace/braces] [5]
Total errors found: 4 in 10 files


If any of these errors are false positives, please file a bug against check-webkit-style.

[Yongjun Zhang]

Created attachment 220810 [details]
Fix style issues.

[Pratik Solanki]

Comment on attachment 220810 [details]
Fix style issues.

View in context: https://bugs.webkit.org/attachment.cgi?id=220810&action=review

> Source/WebCore/WebCore.xcodeproj/project.pbxproj:17833
> +		};

Odd move by Xcode. Maybe skip this part before commit?

> Source/WebCore/platform/graphics/ca/GraphicsLayerCA.cpp:3032
> +    float maxPixelDimension = systemMemoryLevel() < cMemoryLevelToUseSmallerPixelDimension ? cMaxPixelDimensionLowMemory : cMaxPixelDimension;

This should be int since cMaxPixelDimension is int.

[Simon Fraser (smfr)]

Comment on attachment 220810 [details]
Fix style issues.

View in context: https://bugs.webkit.org/attachment.cgi?id=220810&action=review

> Source/WebCore/platform/ios/TileControllerMemoryHandlerIOS.cpp:68
> +void TileControllerMemoryHandler::trimUnparentedTilesToTarget(unsigned target)

Use an int for the argument. Surprising things can happen using unsigned math.

> Source/WebCore/platform/ios/TileControllerMemoryHandlerIOS.h:40
> +    void updateForTileController(TileController*);

I think this would be better named tileControllerGainedUnparentedTiles() or similar.

[Yongjun Zhang]

Created attachment 220865 [details]
Address review comments before landing.

[WebKit Commit Bot]

Comment on attachment 220865 [details]
Address review comments before landing.

Clearing flags on attachment: 220865

Committed r161675: <http://trac.webkit.org/changeset/161675>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.