Re: Perf regression coming (and going away) on Linux Release

[Primiano Tucci]

tracing@ -> perf-sheriffs@

Apologies if you received this twice, I confused the lists, this was meant for sheriffs.

On Thu, Mar 10, 2016 at 7:33 PM Primiano Tucci <prim...@chromium.org> wrote:

TL;DR

If you are not perf-sheriffing you can stop reading here.

crrev.com/1675143004 (#380196) caused a perf regression on linux-release.

crrev.com/1777363002 should fix it

As speculated in the commit message, crrev.com/1675143004 ended up causing a visible across-the board perf regression (example) due to crbug.com/593344. 

I was hoping that would have not been visible (the local benchmarks I tried before landing were noisy), but that was not the case.

Not sure if the GASP alert system realized that already, I think it will do that soon. The regression is linux-only.

I have a cure pending review in, that should fix it crrev.com/1777363002.

So, if you are sheriffing and see an across-the-board perf regression on Linux around #380196, (I guess all page cyclers might be affected) that's me and should go away once crrev.com/1777363002 lands.

Apology for the inconvenience, I tried to be as much proactive as possible but... perf benchmarks are hard.

[Ryan Schoen]

+regression sheriffs for today and tomorrow

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