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

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Date: Mon, 26 Feb 2024 11:12:43 +0100
From: Vlastimil Babka <vbabka@...e.cz>
To: Marco Elver <elver@...gle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
 Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>,
 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 2/26/24 10:25, Marco Elver wrote:
> On Tue, 20 Feb 2024 at 19:51, Marco Elver <elver@...gle.com> wrote:
>>
>> While it would be nice if 6.8 would not regress over 6.7 (performance
>> is mostly fixed, memory usage is not), waiting for confirmation what
>> the rcutorture issue from the bot is about might be good.
>>
>> Mikhail: since you are testing mainline, in about 4 weeks the fixes
>> should then reach 6.9-rc in the next merge window. Until then, if it's
>> not too difficult for you, you can apply those 2 patches in your own
>> tree.
> 
> There are more issues that are fixed by "[PATCH v2 1/2] stackdepot:
> use variable size records for non-evictable entries". See
> https://lore.kernel.org/all/ZdxYXQdZDuuhcqiv@elver.google.com/
> 
> This will eventually reach stable, but it might be good to reconsider
> mainlining it earlier.

I believe I can see that patch, together with "kasan: revert eviction of
stack traces in generic mode" in mm-hotfixes-stable so it should be on track
for 6.8.

> Thanks,
> -- Marco