Re: [PATCH 5.13 073/127] pipe: avoid unnecessary EPOLLET wakeups under normal loads

From: Sasha Levin
Date: Tue Aug 24 2021 - 13:42:18 EST

On Tue, Aug 24, 2021 at 10:00:33AM -0700, Linus Torvalds wrote:
On Tue, Aug 24, 2021 at 9:57 AM Sasha Levin <sashal@xxxxxxxxxx> wrote:

From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>

[ Upstream commit 3b844826b6c6affa80755254da322b017358a2f4 ]

This one has an odd performance regression report associated with it.

Honestly, I don't understand the performance regression, but that's
likely on me, not on the kernel test robot.

So I'd hold off on applying it for now. It *might* be some odd test
robot hiccup, but ..

I'll drop it for now.

Ideally we wouldn't take it at all, but I don't think any of us wants to
field "my tests have regressed!" questions for the next 5 years or so.