linux-kernel - Re: 6.10/regression/bisected - after f1d97e769152 I spotted increased execution time of the kswapd0 process and symptoms as if there is not enough memory

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Message-ID: <CAL3q7H4iYRsjG9BvRYh_aB6UN-QFuTCqJdiq6hV_Xh7+U7qJ5A@mail.gmail.com>
Date: Sun, 11 Aug 2024 16:33:54 +0100
From: Filipe Manana <fdmanana@...nel.org>
To: Jannik Glückert <jannik.glueckert@...il.com>
Cc: andrea.gelmini@...il.com, dsterba@...e.com, josef@...icpanda.com, 
	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org, 
	mikhail.v.gavrilov@...il.com, regressions@...ts.linux.dev
Subject: Re: 6.10/regression/bisected - after f1d97e769152 I spotted increased
 execution time of the kswapd0 process and symptoms as if there is not enough memory

On Sun, Aug 11, 2024 at 9:08 AM Jannik Glückert
<jannik.glueckert@...il.com> wrote:
>
> Hello,
>
> I am still encountering this issue on 6.10.3. As far as I can see this
> is the last post in the thread, if the discussion continued elsewhere
> please let me know.
>
> My workload is a backup via restic, the system is idle otherwise.
> This is on a Zen4 CPU with a very fast PCIe Gen4 nvme, so perhaps it was
> fixed for others because they had comparatively slow IO or a smaller
> workload?
>
> I have attached the bpftrace run and a graph of the memory PSI. kswapd0
> is at 100% during the critical sections. dmesg is empty.
> Important events were e.g. 09:31-09:32 and 09:33-09:34 where the system
> was completely unresponsive multiple times, for about 5 seconds at a time.
>
> I did also mention this on the #btrfs IRC channel and there are other
> users still encountering this on 6.10

This came to my attention a couple days ago in a bugzilla report here:

https://bugzilla.kernel.org/show_bug.cgi?id=219121

There's also 2 other recent threads in the mailing about it.

There's a fix there in the bugzilla, and I've just sent it to the mailing list.
In case you want to try it:

https://lore.kernel.org/linux-btrfs/d85d72b968a1f7b8538c581eeb8f5baa973dfc95.1723377230.git.fdmanana@suse.com/

Thanks.



>
> Best
> Jannik