100257 2012-10-24 08:47:04 -0700 Don't fire requestAnimationFrame for scripts in frames that are out of view 2017-02-01 13:49:51 -0800 1 1 1 Unclassified WebKit New Bugs 528+ (Nightly build) Unspecified Unspecified RESOLVED DUPLICATE 144718 https://bugs.webkit.org/show_bug.cgi?id=144718 P2 Normal --- 1 nick webkit-unassigned barraclough cdumez cmuppala dglazkov dino mjs simon.fraser webkit.review.bot oldest_to_newest 749709 0 nick 2012-10-24 08:47:04 -0700 Don't fire requestAnimationFrame for scripts in frames that are out of view 749719 1 170408 nick 2012-10-24 09:01:24 -0700 Created attachment 170408 Patch 749721 2 nick 2012-10-24 09:02:50 -0700 When a frame is out of view (such as an iframe that's scrolled offscreen), WebKit shouldn't fire requestAnimationFrame callbacks. Avoiding these unnecessary callbacks reduces CPU consumption, and thus, battery consumption on mobile devices. The attached patch implements that optimisation. 749766 3 170408 webkit.review.bot 2012-10-24 10:13:06 -0700 Comment on attachment 170408 Patch Attachment 170408 did not pass chromium-ews (chromium-xvfb): Output: http://queues.webkit.org/results/14563259 New failing tests: fast/animation/request-animation-frame-offscreen-iframe.html fast/animation/request-animation-frame-in-scrolled-div.html fast/animation/request-animation-frame-iframe.html fast/animation/request-animation-frame-iframe2.html 753375 4 170408 dino 2012-10-29 06:53:47 -0700 Comment on attachment 170408 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=170408&action=review This looks ok to me, but I'm not sure why some older tests are failing. > LayoutTests/ChangeLog:12 > + When a frame is out of view (such as an iframe that's scrolled > + offscreen), WebKit shouldn't fire requestAnimationFrame callbacks. > + > + Avoiding these unnecessary callbacks reduces CPU consumption, and thus, > + battery consumption on mobile devices. Needs more indentation. 753377 5 170408 dino 2012-10-29 06:54:34 -0700 Comment on attachment 170408 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=170408&action=review > LayoutTests/fast/animation/request-animation-frame-in-scrolled-div.html:24 > + if (window.testRunner) > + testRunner.display(); Indentation broken. > LayoutTests/fast/animation/request-animation-frame-in-scrolled-div.html:41 > + if (window.testRunner) > + testRunner.notifyDone(); Indentation broken. 753397 6 nick 2012-10-29 07:08:28 -0700 I'll fix those and resubmit. The tests all pass on my machine (OS X 10.7.5); I'm currently trying (without much success) to build the chromium port of Webkit to try and replicate the failure buildbot is seeing. Any insight anyone can provide would be greatly appreciated, since the buildbot doesn't seem to show test output anywhere. 753579 7 171278 nick 2012-10-29 10:22:39 -0700 Created attachment 171278 Patch 753583 8 171278 darin 2012-10-29 10:26:44 -0700 Comment on attachment 171278 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=171278&action=review > Source/WebCore/dom/ScriptedAnimationController.cpp:123 > + if (view && view->windowClipRect(false).isEmpty()) { > + scheduleAnimation(); > + return; > + } Two things seem not quite right to me. 1) I don’t think that windowClipRect(false).isEmpty() is the correct visibility check; I can’t find any other code that’s using that and this can’t be the only place we care about visibility. 2) I don’t think that polling is the right way to detect when the frame becomes visible again. We want to actively trigger it rather than running the timer over and over again. 753606 9 nick 2012-10-29 10:48:04 -0700 (In reply to comment #8) > (From update of attachment 171278 [details]) > View in context: https://bugs.webkit.org/attachment.cgi?id=171278&action=review > > > Source/WebCore/dom/ScriptedAnimationController.cpp:123 > > + if (view && view->windowClipRect(false).isEmpty()) { > > + scheduleAnimation(); > > + return; > > + } > > Two things seem not quite right to me. > > 1) I don’t think that windowClipRect(false).isEmpty() is the correct visibility check; I can’t find any other code that’s using that and this can’t be the only place we care about visibility. I spent a lot of time reading the code to try and understand the rendering process; I found windowClipRect in use in ScrollView::scrollContents to determine the visible part of the window. If there's a better method to use, I'm happy to change it; I just wasn't able to find a better choice myself. > 2) I don’t think that polling is the right way to detect when the frame becomes visible again. We want to actively trigger it rather than running the timer over and over again. I agree entirely, but based on my search of the code concerned with scrolling and rendering, there's currently nothing that triggers events when elements become visible or invisible, and no facility to trigger those events. Adding it would undoubtedly be possible, but I suspect it would be a significant and much higher impact (and risk) change. The polling approach, while slightly messy, is an easy win - the timer is running repeatedly already, the patch simply avoids the expensive JavaScript callback when it's unnecessary - and seems unlikely to have unexpected side effects. In my experiments with content rendered in an iframe using requestAnimationFrame, CPU usage drops from anything up to 100% to effectively zero when the frame is scrolled offscreen. 753684 10 171278 webkit.review.bot 2012-10-29 12:38:29 -0700 Comment on attachment 171278 Patch Attachment 171278 did not pass chromium-ews (chromium-xvfb): Output: http://queues.webkit.org/results/14641174 New failing tests: fast/animation/request-animation-frame-offscreen-iframe.html fast/animation/request-animation-frame-in-scrolled-div.html fast/animation/request-animation-frame-iframe.html fast/animation/request-animation-frame-iframe2.html 754092 11 nick 2012-10-30 02:04:49 -0700 (In reply to comment #10) > (From update of attachment 171278 [details]) > Attachment 171278 [details] did not pass chromium-ews (chromium-xvfb): > Output: http://queues.webkit.org/results/14641174 > > New failing tests: > fast/animation/request-animation-frame-offscreen-iframe.html > fast/animation/request-animation-frame-in-scrolled-div.html > fast/animation/request-animation-frame-iframe.html > fast/animation/request-animation-frame-iframe2.html These tests pass on my mac, and I've now built the Chromium port of Webkit on Linux (Ubuntu 12.10), where they also pass. Is anyone able to provide insight into why they are failing on buildbot? 758334 12 nick 2012-11-05 01:41:05 -0800 I've tried everything I can think of to reproduce the failures buildbot is seeing, without success. The suggestion on the webkit-dev mailing list is to land the patch and take care of any failures if they arise on the build console, where the details of the failures will be visible. If there's anything else I need to do in order to get this patch approved and landed, please let me know. 761768 13 171278 darin 2012-11-08 07:25:21 -0800 Comment on attachment 171278 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=171278&action=review >>> Source/WebCore/dom/ScriptedAnimationController.cpp:123 >>> + } >> >> Two things seem not quite right to me. >> >> 1) I don’t think that windowClipRect(false).isEmpty() is the correct visibility check; I can’t find any other code that’s using that and this can’t be the only place we care about visibility. >> 2) I don’t think that polling is the right way to detect when the frame becomes visible again. We want to actively trigger it rather than running the timer over and over again. > > I spent a lot of time reading the code to try and understand the rendering process; I found windowClipRect in use in ScrollView::scrollContents to determine the visible part of the window. If there's a better method to use, I'm happy to change it; I just wasn't able to find a better choice myself. OK. That’s a fine explanation for why you did what you did, but not reason to land this patch as-is. We need to find others expert on this enough that they can help us find the right way to do it. We do want this behavior change, but we need a correct implementation. 761806 14 nick 2012-11-08 08:00:47 -0800 Landing this patch would not preclude landing a later one that implements an event driven model. The patch is not incorrect; it's simply the case that there exists a potential implementation that is more efficient. Is it your position that it's better to have no patch than this one? It seems to me that a better approach would be to land this patch now, and implement a better solution later, since this patch provides a performance improvement - just one that isn't as great as it could potentially be. 763042 15 simon.fraser 2012-11-09 08:28:21 -0800 (In reply to comment #14) > Is it your position that it's better to have no patch than this one? It seems to me that a better approach would be to land this patch now, and implement a better solution later, since this patch provides a performance improvement - just one that isn't as great as it could potentially be. Do you know of any actual pages that would benefit from this performance improvement? What does the page visibility API do for out-of-view iframes? 763092 16 nick 2012-11-09 09:33:17 -0800 (In reply to comment #15) > (In reply to comment #14) > > Is it your position that it's better to have no patch than this one? It seems to me that a better approach would be to land this patch now, and implement a better solution later, since this patch provides a performance improvement - just one that isn't as great as it could potentially be. > > Do you know of any actual pages that would benefit from this performance improvement? In practice, there are few pages currently using requestAnimationFrame, since it's not widespread yet. In principle, any animated advert in an IFrame (which is most of them) would benefit from this if the ad used requestAnimationFrame. > > What does the page visibility API do for out-of-view iframes? Per the spec (http://www.w3.org/TR/page-visibility/#sec-document-interface): "On getting, the hidden attribute MUST return true if the Document contained by the top level browsing context (root window in the browser's viewport) [HTML5] is not visible at all. The attribute MUST return false if the Document contained by the top level browsing context is at least partially visible on at least one screen." So as it stands, it conveys visibility information only for the top level document, not for any nested documents. I don't believe there's any assumption that the Document.hidden property will correlate with the status of a requestAnimationFrame callback anywhere, though. 763171 17 mjs 2012-11-09 11:03:47 -0800 (In reply to comment #16) > (In reply to comment #15) > > > > What does the page visibility API do for out-of-view iframes? > > Per the spec (http://www.w3.org/TR/page-visibility/#sec-document-interface): > > "On getting, the hidden attribute MUST return true if the Document contained by the top level browsing context (root window in the browser's viewport) [HTML5] is not visible at all. The attribute MUST return false if the Document contained by the top level browsing context is at least partially visible on at least one screen." > > So as it stands, it conveys visibility information only for the top level document, not for any nested documents. I don't believe there's any assumption that the Document.hidden property will correlate with the status of a requestAnimationFrame callback anywhere, though. Is this patch consistent with the RAF spec? It says: <http://www.w3.org/TR/animation-timing/> "Whenever a Document's hidden attribute is false and the animation frame request callback list is not empty, the user agent MUST regularly queue a task that samples all animations for that Document's top-level browsing context." So taken literally, it does not seem to allow the behavior of this patch. 1272224 18 simon.fraser 2017-02-01 12:06:26 -0800 I think we fixed this already. 1272259 19 cdumez 2017-02-01 13:49:51 -0800 *** This bug has been marked as a duplicate of bug 144718 *** 170408 2012-10-24 09:01:24 -0700 2012-10-29 10:22:32 -0700 Patch bug-100257-20121024165959.patch text/plain 8948 nick U3VidmVyc2lvbiBSZXZpc2lvbjogMTMyMzQyCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggYjIyYWYzZGU5ZjBlY2Fm NmVmZmQ0MGQ0NDRjM2YzZjI2MzUyOTYwOC4uMTYzNTkxZDc4ZTBjN2FmOTdkMmYyMzE2ZWQ4ZjU4 OTQzMDJlODhjMyAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDI2IEBACisyMDEyLTEwLTI0ICBOaWNr IEpvaG5zb24gIDxuaWNrQHNwaWRlci5pbz4KKworICAgICAgICBEb24ndCBmaXJlIHJlcXVlc3RB bmltYXRpb25GcmFtZSBmb3Igc2NyaXB0cyBpbiBmcmFtZXMgdGhhdCBhcmUgb3V0IG9mIHZpZXcK KyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTEwMDI1Nwor 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