linux-kernel - Re: kswapd0: page allocation failure: order:0, mode:0x820(GFP_ATOMIC), nodemask=(null),cpuset=/,mems

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Date: Tue, 4 Jun 2024 20:03:27 -0700
From: Yosry Ahmed <yosryahmed@...gle.com>
To: Erhard Furtner <erhard_f@...lbox.org>
Cc: Yu Zhao <yuzhao@...gle.com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, 
	linuxppc-dev@...ts.ozlabs.org, Johannes Weiner <hannes@...xchg.org>, 
	Nhat Pham <nphamcs@...il.com>, Chengming Zhou <chengming.zhou@...ux.dev>, 
	Sergey Senozhatsky <senozhatsky@...omium.org>, Minchan Kim <minchan@...nel.org>
Subject: Re: kswapd0: page allocation failure: order:0, mode:0x820(GFP_ATOMIC),
 nodemask=(null),cpuset=/,mems_allowed=0 (Kernel v6.5.9, 32bit ppc)

On Tue, Jun 4, 2024 at 2:10 PM Erhard Furtner <erhard_f@...lbox.org> wrote:
>
> On Tue, 4 Jun 2024 11:01:39 -0700
> Yosry Ahmed <yosryahmed@...gle.com> wrote:
>
> > How many CPUs does this machine have? I am wondering if 32 can be an
> > overkill for small machines, perhaps the number of pools should be
> > max(nr_cpus, 32)?
>
> This PowerMac G4 DP got 2 CPUs. Not much for a desktop machine by todays standards but some SoCs have less. ;)
>
>  # lscpu
> Architecture:          ppc
>   CPU op-mode(s):      32-bit
>   Byte Order:          Big Endian
> CPU(s):                2
>   On-line CPU(s) list: 0,1
> Model name:            7455, altivec supported
>   Model:               3.3 (pvr 8001 0303)
>   Thread(s) per core:  1
>   Core(s) per socket:  1
>   Socket(s):           2
>   BogoMIPS:            83.78
> Caches (sum of all):
>   L1d:                 64 KiB (2 instances)
>   L1i:                 64 KiB (2 instances)
>   L2:                  512 KiB (2 instances)
>   L3:                  4 MiB (2 instances)
>
> Regards,
> Erhard

Could you check if the attached patch helps? It basically changes the
number of zpools from 32 to min(32, nr_cpus).

Download attachment "0001-mm-zswap-do-not-scale-the-number-of-zpools-unnecessa.patch" of type "application/octet-stream" (3935 bytes)