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

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Date: Sun, 2 Jun 2024 23:36:56 +0200
From: Erhard Furtner <erhard_f@...lbox.org>
To: Yu Zhao <yuzhao@...gle.com>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
 linuxppc-dev@...ts.ozlabs.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 Sun, 2 Jun 2024 14:38:18 -0600
Yu Zhao <yuzhao@...gle.com> wrote:

> I compared the .config between v6.8.9 (you attached previously) and
> v6.1.92 -- I didn't see any major differences (both have ZONE_DMA,
> HIGHMEM, MGLRU and zswap/zsmalloc). Either there is something broken
> between v6.1.92 and v6.6.32 (as you mentioned above), or it's just a
> kernel allocation bloat which puts the DMA zone (0.25GB) under too
> heavy pressure. The latter isn't uncommon when upgrading to a newer
> version of the kernel.
> 
> Could you please attach the dmesg from v6.1.92? I want to compare the
> dmegs between the two kernel versions as well -- that might provide
> some hints.

No problem, attached please find the v6.1.92 dmesg and also the v6.9.3 .config and dmesg.

I stripped down the v6.9.3 .config a bit (to ease 'make oldconfig' for older kernels) from my originally posted v6.8.9 .config and used that as a starting point for v6.6.32 and v6.1.92.

Also I started a git bisect. Let's see if I get something meaningful out of this...

Regards,
Erhard

Download attachment "config_693_g4-" of type "application/octet-stream" (104402 bytes)

Download attachment "dmesg_6192_g4" of type "application/octet-stream" (40695 bytes)

Download attachment "dmesg_693_g4" of type "application/octet-stream" (46350 bytes)