linux-kernel - Re: regression/bisected commit 773688a6cb24b0b3c2ba40354d883348a2befa38 make my system completely unusable under high load

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Message-ID: <91c50335-e7b6-4ae1-9dad-a0c990b52021@suse.cz>
Date: Mon, 19 Feb 2024 11:09:23 +0100
From: Vlastimil Babka <vbabka@...e.cz>
To: Marco Elver <elver@...gle.com>,
 Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>,
 Andrew Morton <akpm@...ux-foundation.org>
Cc: Andrey Konovalov <andreyknvl@...il.com>, glider@...gle.com,
 dvyukov@...gle.com, eugenis@...gle.com, Oscar Salvador <osalvador@...e.de>,
 Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
 Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: regression/bisected commit
 773688a6cb24b0b3c2ba40354d883348a2befa38 make my system completely unusable
 under high load

On 2/19/24 10:52, Marco Elver wrote:
> On Mon, 19 Feb 2024 at 10:48, Mikhail Gavrilov
> <mikhail.v.gavrilov@...il.com> wrote:
>>
>> On Sat, Feb 3, 2024 at 1:14 AM Mikhail Gavrilov
>> <mikhail.v.gavrilov@...il.com> wrote:
>> >
>> > You are right.
>> > Thanks for digging into it!
>> >
>>
>> This [2] revert is still not merged at least I checked on 4f5e5092fdbf.
>> Is there any plan to merge it or find another approach?
>>
>> [2] https://lore.kernel.org/all/20240118110216.2539519-2-elver@google.com/
> 
> I think it's already in -mm and -next. It just takes time, which is a
> good thing, after all we want to let -next testing confirm nothing is
> wrong with it.
> 
> Andrew, is this planned for the next merge window or as a "hot fix"
> for the current rc? Given it has the right "Fixes" tags it will make
> it to stable kernels eventually, but I also think that the previous
> "slow" version is almost unusable on big systems, so it may be
> worthwhile considering the current rc.

Yeah it would be best to fix in 6.8 to prevent regressions.

> Thanks,
> -- Marco