TabIdAnnotator janking main thread |
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Issue descriptionOn stable channel (63.0.3239.132) I am seeing pretty egregious UI jank, with a few 1-2 sec pauses spaced about 4-5 seconds apart, all recurring every few minutes. I finally managed to grab a trace while it was happening, and the long running UI-thread task always seems to be "Annotate" in chrome/browser/data_usage/tab_id_annotator.cc
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Jan 23 2018
sclittle, bengr: Is this code still in use? Can it be nuked? Disabled for most of the users?
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Jan 23 2018
Weird, TabIdAnnotator::Annotate doesn't do any long-running stuff, plus that method actually runs on the IO thread, so it's odd that it would cause any UI jank. Can you provide some more information?
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Jan 23 2018
Yeah I looked at the code and it didn't seem likely to do any long-running work. Anyway, I just got another trace of it happening and I think it was just coincidence that the first two ended up in the same place. The jank is happening randomly, and while the wall time is seconds long, the CPU time is negligible. So this probably means either a kernel scheduler problem, some kind of corp junk interference, or failing hardware. :( Sorry for the noise!
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Jan 23 2018
Np, thanks for looking into it. |
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Comment 1 by roc...@chromium.org
, Jan 23 2018