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Date: Tue, 4 Jun 2024 23:10:19 +0200
From: Erhard Furtner <erhard_f@mailbox.org>
To: Yosry Ahmed <yosryahmed@google.com>
Cc: Yu Zhao <yuzhao@google.com>, linux-mm@kvack.org,
 linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Johannes
 Weiner <hannes@cmpxchg.org>, Nhat Pham <nphamcs@gmail.com>, Chengming Zhou
 <chengming.zhou@linux.dev>, Sergey Senozhatsky <senozhatsky@chromium.org>,
 Minchan Kim <minchan@kernel.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)
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On Tue, 4 Jun 2024 11:01:39 -0700
Yosry Ahmed <yosryahmed@google.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