linux-kernel - Re: Linux regressions report for mainline [2022-01-09]

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Date:   Sun, 9 Jan 2022 11:20:36 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     "Regzbot (on behalf of Thorsten Leemhuis)" 
        <regressions@...mhuis.info>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linux regressions mailing list <regressions@...ts.linux.dev>
Subject: Re: Linux regressions report for mainline [2022-01-09]

On Sun, Jan 9, 2022 at 10:51 AM Regzbot (on behalf of Thorsten
Leemhuis) <regressions@...mhuis.info> wrote:
>
> 5-10% increase in IO latencies with nohz balance patch

This one is clearly not rootcaused, but even the reporter isn't sure
what triggered it.  It was bisected to that mentioned patch, but even
that bisection result isn't really entirely certain.

So this one will remain pending, I'm afraid.

> pm: laptop totally freezes when going to hibernation
> drm: amdgpu: s0ix suspend stopped working

Something clearly not great in amdgpu suspend/resume land. The reports
are not fully clear, with even the bisection being questionable.

But from the previous cycle reports:

> =========================================================================================
> previous cycle (v5.14..v5.15), culprit identified, with activity in the past three months
> =========================================================================================
>
> drm: amdgpu: NUC8i7HVKVA crashes during system suspend

This one isn't questionable, and Len sent me the revert he's been
using on his system for a long time. So I applied it.

Maybe it's related, maybe it's not.

             Linus