linux-kernel - Re: [PATCH v4 10/17] mm/slab: kmalloc: pass requests larger than order-1 page to page allocator

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Date:   Fri, 14 Oct 2022 13:58:18 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Hyeonggon Yoo <42.hyeyoo@...il.com>
Cc:     Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Roman Gushchin <roman.gushchin@...ux.dev>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 10/17] mm/slab: kmalloc: pass requests larger than
 order-1 page to page allocator

Hi,

On Wed, Aug 17, 2022 at 07:18:19PM +0900, Hyeonggon Yoo wrote:
> There is not much benefit for serving large objects in kmalloc().
> Let's pass large requests to page allocator like SLUB for better
> maintenance of common code.
> 
> Signed-off-by: Hyeonggon Yoo <42.hyeyoo@...il.com>
> Reviewed-by: Vlastimil Babka <vbabka@...e.cz>
> ---

This patch results in a WARNING backtrace in all mips and sparc64
emulations.

------------[ cut here ]------------
WARNING: CPU: 0 PID: 0 at mm/slab_common.c:729 kmalloc_slab+0xc0/0xdc
Modules linked in:
CPU: 0 PID: 0 Comm: swapper Not tainted 6.0.0-11990-g9c9155a3509a #1
Stack : ffffffff 801b2a18 80dd0000 00000004 00000000 00000000 81023cd4 00000000
        81040000 811a9930 81040000 8104a628 81101833 00000001 81023c78 00000000
        00000000 00000000 80f5d858 81023b98 00000001 00000023 00000000 ffffffff
        00000000 00000064 00000002 81040000 81040000 00000001 80f5d858 000002d9
        00000000 00000000 80000000 80002000 00000000 00000000 00000000 00000000
        ...
Call Trace:
[<8010a2bc>] show_stack+0x38/0x118
[<80cf5f7c>] dump_stack_lvl+0xac/0x104
[<80130d7c>] __warn+0xe0/0x224
[<80cdba5c>] warn_slowpath_fmt+0x64/0xb8
[<8028c058>] kmalloc_slab+0xc0/0xdc

irq event stamp: 0
hardirqs last  enabled at (0): [<00000000>] 0x0
hardirqs last disabled at (0): [<00000000>] 0x0
softirqs last  enabled at (0): [<00000000>] 0x0
softirqs last disabled at (0): [<00000000>] 0x0
---[ end trace 0000000000000000 ]---

Guenter