linux-kernel - Re: [PATCH v4 1/1] mm: vmscan: Reduce throttling due to a failure to make progress

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Date:   Sat, 1 Jan 2022 11:52:15 +0100
From:   Thorsten Leemhuis <regressions@...mhuis.info>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Mark Brown <broonie@...nel.org>,
        Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Alexey Avramov <hakavlad@...ox.lv>,
        Rik van Riel <riel@...riel.com>,
        Mike Galbraith <efault@....de>,
        Darrick Wong <djwong@...nel.org>,
        Linux regressions mailing list <regressions@...ts.linux.dev>,
        Linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 1/1] mm: vmscan: Reduce throttling due to a failure to
 make progress


On 31.12.21 20:22, Linus Torvalds wrote:
> On Fri, Dec 31, 2021 at 11:21 AM Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
>>
>> Pushed out as 1b4e3f26f9f7 ("mm: vmscan: Reduce throttling due to a
>> failure to make progress")

Thx.

> .. and I _think_ this empties the regzbot queue for this release, Thorsten. No?

Well, it was the regression that bothered me most. But there are still a
few out there that got introduced this cycle.

There is a regression in RDMA/mlx5 introduced in v5.16-rc5:
https://lore.kernel.org/lkml/f298db4ec5fdf7a2d1d166ca2f66020fd9397e5c.1640079962.git.leonro@nvidia.com/
https://lore.kernel.org/all/EEBA2D1C-F29C-4237-901C-587B60CEE113@oracle.com/
A fix is available, but got stuck afaics:
https://lore.kernel.org/lkml/f298db4ec5fdf7a2d1d166ca2f66020fd9397e5c.1640079962.git.leonro@nvidia.com/
And I only noticed just now: a revert was also discussed, but not performed:
https://lore.kernel.org/all/20211222101312.1358616-1-maorg@nvidia.com/
Will let Greg know, seems the commit got backported to 5.15.

s0ix suspend broke for some AMD machines, Alex and Mario are busy
looking into it:
https://gitlab.freedesktop.org/drm/amd/-/issues/1821
https://bugzilla.kernel.org/show_bug.cgi?id=215436

Alex is also dealing with another issue where the screen contents now
get restored after some input events:
https://bugzilla.kernel.org/show_bug.cgi?id=215203

There still seems to be a performance regression that Josef and Valentin
try hard to pin down without much success for weeks now:
https://lore.kernel.org/lkml/87tuf07hdk.mognet@arm.com/

And there one more report, but it might be a follow-up error due to
another regression:
https://lore.kernel.org/linux-pm/52933493.dBzk7ret6Y@geek500/