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

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Message-ID: <YSUt8NdA+5EPJIyD@sashalap>
Date:   Tue, 24 Aug 2021 13:35:44 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>,
        kernel test robot <oliver.sang@...el.com>,
        Sandeep Patil <sspatil@...roid.com>,
        Mel Gorman <mgorman@...hsingularity.net>
Subject: Re: [PATCH 5.13 073/127] pipe: avoid unnecessary EPOLLET wakeups
 under normal loads

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@...nel.org> wrote:
>>
>> From: Linus Torvalds <torvalds@...ux-foundation.org>
>>
>> [ 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.

Thanks!

-- 
Thanks,
Sasha