Timeline - Events categories

[Daniel Rosa]

Hi guys!

In the timeline, there are a pie chart representing the aggregated time of the recording, like the one attached.

I'm trying to understand how this characterization happens, e.g. which criteria is used to determine if certain event should be considered as Rendering.

Anyone knows the criteria for this characterization? Is it done on devtools side (frontend) or on blink side (backend)?

Cheers,

Daniel

[Daniel Rosa]

Elaborating a bit more the question, and being more specific, what I aim to understand is how can I correlate the functions calls listed in chrome://tracing with the categories (Loading, Scripting, Rendering, Painting, Other) in Timeline.

E.g. In which category of timeline the call to AnimationTimeline::serviceAnimations is accounted

Cheers,

Daniel

[Paul Irish]

The eventStyles object has the categorization of all RecordTypes:

https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit/Source/devtools/front_end/timeline/TimelineUIUtils.js&q=TimelineUIUtils.categories%20f:devtools%20-f:out&sq=package:chromium&type=cs&l=61

Here's the mapping of RecordTypes:

https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit/Source/devtools/front_end/timeline/TimelineModel.js&q=UpdateLayerTree%20f:devtools%20-f:out&sq=package:chromium&type=cs&l=50

It's a whitelist so not everything in tracing maps.

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