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Issue 787784 link

Starred by 1 user
Status: Assigned
Owner:
schenney@chromium.org
Cc:
skyos...@chromium.org
Components:
EstimatedDays: ----
NextAction: ----
OS: Linux
Pri: 3
Type: Bug



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Some yandex pages use a lot of idle-time CPU

Project Member Reported by eseckler@chromium.org, Nov 22 2017 
It seems to be related to the page requesting animation frames, which end up not causing any display update. Yet, the layer tree is updated, during which ScrollingCoordinator::updateAfterCompositingChangeIfNeeded is called.

The children of that event, 
particularly ScrollingCoordinator::setTouchEventTargetRects and ScrollingCoordinator::projectRectsToGraphicsLayerSpace
, use quite a significant amount of cpu time (~15-30ms on my machine per frame).

Is this something that we could optimize?

I attached a trace from loading [1] in chrome on Linux x64 (desktop). Same issue also observed in headless mode.

[1] https://market.yandex.ru/catalog/70732/list?hid=91497&glfilter=7893318%3A6840151
trace_yandex_setTouchEventTargetRects.json.gz
8.9 MB Download

Comment 1 by schenney@chromium.org, Nov 27 2017

Owner: schenney@chromium.org
Status: Assigned (was: Untriaged)
There's not much we can do about the page requesting animation frames then not doing anything, although some other bug or review did just go past me related to this. In that case the RAF was changing something off screen so not changing rendered content.

But maybe the code can be optimized, so I'll leave it open and look at it.

Comment 2 by chrishtr@chromium.org, Dec 13 2017 

I can't reproduce this right now. But the page links look pretty broken, maybe
Yandex has a site bug today.
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