Bug 163353 – Share inline stylesheets between shadow trees

• Status: RESOLVED
• Resolution: FIXED
• Component: CSS

[Antti Koivisto]

If shadow trees have identical inline stylesheets the data structures can be shared. This will also allow sharing style resolvers in future.

[Antti Koivisto]

Created attachment 291390 [details]
patch

[Andreas Kling]

Comment on attachment 291390 [details]
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=291390&action=review

> Source/WebCore/dom/InlineStyleSheetOwner.cpp:192
> +        fprintf(stderr, "retrieved inline stylesheet from cache, rules=%d\n", cachedSheet->ruleCount());

Well I suppose that's good to know about...

> Source/WebCore/dom/InlineStyleSheetOwner.cpp:209
> +        fprintf(stderr, "adding stylesheet to cache, rules=%d\n", m_sheet->contents().ruleCount());

More great information!

> Source/WebCore/platform/MemoryPressureHandler.cpp:111
> +    {
> +        ReliefLogger log("Clear inline stylesheet cache");
> +        InlineStyleSheetOwner::clearCache();
> +    }

r=me based on this.

[Ryosuke Niwa]

Comment on attachment 291390 [details]
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=291390&action=review

> Source/WebCore/css/parser/CSSParserMode.h:126
> +        hash ^= URLHash::hash(key.baseURL);
> +        hash ^= StringHash::hash(key.charset);
> +        hash ^= WTF::intHash(static_cast<unsigned>(key.mode));

Is there a better way to combine hash?

> Source/WebCore/dom/InlineStyleSheetOwner.cpp:192
> +        fprintf(stderr, "retrieved inline stylesheet from cache, rules=%d\n", cachedSheet->ruleCount());

Debugging code?

> Source/WebCore/dom/InlineStyleSheetOwner.cpp:209
> +        fprintf(stderr, "adding stylesheet to cache, rules=%d\n", m_sheet->contents().ruleCount());

Debugging code?

[Ryosuke Niwa]

Comment on attachment 291390 [details]
patch

Oops, sorry, didn't mean to clear the r+.

[Antti Koivisto]

https://trac.webkit.org/changeset/207286

[Darin Adler]

Comment on attachment 291390 [details]
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=291390&action=review

>> Source/WebCore/css/parser/CSSParserMode.h:126
>> +        hash ^= WTF::intHash(static_cast<unsigned>(key.mode));
> 
> Is there a better way to combine hash?

Longer term, the better way to hash a bunch of things is to construct a single hasher and then hash one item after another. Doing an exclusive or of hashes is nowhere near as a good as that. To make then hashes better in cases like this one I would like us to make a hasher class that is perhaps a bit like StringBuilder and lets us easily hash a sequence of different types of data and make a single hash out of all of it. Presumably we want to usually avoid both the "exclusive or'd hashes" pattern and even the "hash of hashes" pattern.

[Ryan Haddad]

Reverted r207286 for reason:

Caused LayoutTest http/tests/misc/acid3.html to fail.

Committed r207291: <http://trac.webkit.org/changeset/207291>

[Ryan Haddad]

*** Bug 163391 has been marked as a duplicate of this bug. ***

[Ryan Haddad]

(In reply to comment #7)
> Reverted r207286 for reason:
> 
> Caused LayoutTest http/tests/misc/acid3.html to fail.
> 
> Committed r207291: <http://trac.webkit.org/changeset/207291>

Details in https://bugs.webkit.org/show_bug.cgi?id=163391

[Antti Koivisto]

Created attachment 291612 [details]
patch

[Build Bot]

Comment on attachment 291612 [details]
patch

Attachment 291612 [details] did not pass mac-wk2-ews (mac-wk2):
Output: http://webkit-queues.webkit.org/results/2283784

Number of test failures exceeded the failure limit.

[Build Bot]

Created attachment 291617 [details]
Archive of layout-test-results from ews105 for mac-yosemite-wk2

The attached test failures were seen while running run-webkit-tests on the mac-wk2-ews.
Bot: ews105  Port: mac-yosemite-wk2  Platform: Mac OS X 10.10.5

[Build Bot]

Comment on attachment 291612 [details]
patch

Attachment 291612 [details] did not pass mac-debug-ews (mac):
Output: http://webkit-queues.webkit.org/results/2283857

Number of test failures exceeded the failure limit.

[Build Bot]

Created attachment 291619 [details]
Archive of layout-test-results from ews113 for mac-yosemite

The attached test failures were seen while running run-webkit-tests on the mac-debug-ews.
Bot: ews113  Port: mac-yosemite  Platform: Mac OS X 10.10.5

[Build Bot]

Comment on attachment 291612 [details]
patch

Attachment 291612 [details] did not pass ios-sim-ews (ios-simulator-wk2):
Output: http://webkit-queues.webkit.org/results/2283893

Number of test failures exceeded the failure limit.

[Build Bot]

Created attachment 291620 [details]
Archive of layout-test-results from ews123 for ios-simulator-wk2

The attached test failures were seen while running run-webkit-tests on the ios-sim-ews.
Bot: ews123  Port: ios-simulator-wk2  Platform: Mac OS X 10.11.6

[Build Bot]

Comment on attachment 291612 [details]
patch

Attachment 291612 [details] did not pass mac-ews (mac):
Output: http://webkit-queues.webkit.org/results/2284000

Number of test failures exceeded the failure limit.

[Build Bot]

Created attachment 291622 [details]
Archive of layout-test-results from ews103 for mac-yosemite

The attached test failures were seen while running run-webkit-tests on the mac-ews.
Bot: ews103  Port: mac-yosemite  Platform: Mac OS X 10.10.5

[Antti Koivisto]

Created attachment 291623 [details]
patch

[Build Bot]

Comment on attachment 291623 [details]
patch

Attachment 291623 [details] did not pass mac-debug-ews (mac):
Output: http://webkit-queues.webkit.org/results/2284225

Number of test failures exceeded the failure limit.

[Build Bot]

Created attachment 291626 [details]
Archive of layout-test-results from ews112 for mac-yosemite

The attached test failures were seen while running run-webkit-tests on the mac-debug-ews.
Bot: ews112  Port: mac-yosemite  Platform: Mac OS X 10.10.5

[Build Bot]

Comment on attachment 291623 [details]
patch

Attachment 291623 [details] did not pass mac-ews (mac):
Output: http://webkit-queues.webkit.org/results/2284266

Number of test failures exceeded the failure limit.

[Build Bot]

Created attachment 291628 [details]
Archive of layout-test-results from ews101 for mac-yosemite

The attached test failures were seen while running run-webkit-tests on the mac-ews.
Bot: ews101  Port: mac-yosemite  Platform: Mac OS X 10.10.5

[Build Bot]

Comment on attachment 291623 [details]
patch

Attachment 291623 [details] did not pass mac-wk2-ews (mac-wk2):
Output: http://webkit-queues.webkit.org/results/2284269

Number of test failures exceeded the failure limit.

[Build Bot]

Created attachment 291629 [details]
Archive of layout-test-results from ews105 for mac-yosemite-wk2

The attached test failures were seen while running run-webkit-tests on the mac-wk2-ews.
Bot: ews105  Port: mac-yosemite-wk2  Platform: Mac OS X 10.10.5

[Build Bot]

Comment on attachment 291623 [details]
patch

Attachment 291623 [details] did not pass ios-sim-ews (ios-simulator-wk2):
Output: http://webkit-queues.webkit.org/results/2284275

Number of test failures exceeded the failure limit.

[Build Bot]

Created attachment 291630 [details]
Archive of layout-test-results from ews123 for ios-simulator-wk2

The attached test failures were seen while running run-webkit-tests on the ios-sim-ews.
Bot: ews123  Port: ios-simulator-wk2  Platform: Mac OS X 10.11.6

[Antti Koivisto]

Created attachment 291631 [details]
patch

[Antti Koivisto]

https://trac.webkit.org/r207339