1169144 - Last markers are hidden under the scrollbar in waterfall view on Linux

Status: RESOLVED WONTFIX

(DevTools :: Performance Tools (Profiler/Timeline), defect, P3)

Description

[Sami Jaktholm]

Attachment: performance-markers-under-scrollbar.png

STR:
1. Go to http://wbamberg.github.io/performance-scenarios/animation-transform-margin/index.html and press start.
2. Open performance tool.
3. Start recording.
4. Wait a while and then stop recording.
5. Scroll to the bottom of the waterfall view.

Expected results: Even the last markers are visible in the waterfall view.
Actual results: The last markers are hidden under the scrollbar. See the attached screenshot.

Tested on an fx-team build from rev e88fd1006b84.

Comment 1

[Victor Porof [:vporof][:vp]]

Triaging. Filter on ADRENOCORTICOTROPIC (yes).

Comment 2

[Patrick Brosset <:pbro>]

[good first bug] whiteboard -> keyword mass change

Comment 3

[sbshriram16]

I am new to open source. I followed STR but this slows down the computer a lot. Which I checked the performance, I saw firefox taking 100% of CPU. Is this caused by using CPU(not GPU) for animation?

Comment 4

[Greg Tatum [:gregtatum]]

Hey there! It might be a good idea to wait until

Comment 5

[Greg Tatum [:gregtatum]]

Hey there! It might be a good idea to wait until Bug 1152441 gets resolved, which recreates the view for the waterfall using a React component. It only renders the markers in view, so it should be a lot lot faster than what we currently have. It would still be great to verify that this bug still exists or not after Bug 1152441 lands.

Comment 6

[Sami Jaktholm]

As Greg mentioned the slowdown is caused by rendering everything at once which causes a lot of allocations etc. You don't need to get that many events to test this - just enough that the scrollbar is visible. So try doing a shorter recording and then check the bug.

Comment 7

[Julien Wajsberg [:julienw]]

Now that we replaced the old performance panel by the Firefox Profiler (see Bug 1668219) we're closing bugs related to this.

Filter on MASSCLOSEOLDPERFTOOLBUGS.