linux-kernel - Re: [PATCH v2 1/3] mm,slub: Do not special case N_NORMAL nodes for slab

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Message-ID: <f06d735c-894a-4c93-bd1b-817e9e978be6@suse.cz>
Date: Wed, 30 Apr 2025 10:57:06 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: Oscar Salvador <osalvador@...e.de>, David Hildenbrand <david@...hat.com>
Cc: Harry Yoo <harry.yoo@...cle.com>,
 Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org, Jonathan Cameron
 <Jonathan.Cameron@...wei.com>, linux-cxl@...r.kernel.org
Subject: Re: [PATCH v2 1/3] mm,slub: Do not special case N_NORMAL nodes for
 slab_nodes

On 4/30/25 10:47, Oscar Salvador wrote:
> On Tue, Apr 08, 2025 at 08:18:32PM +0200, David Hildenbrand wrote:
>> We could by grabbing the mutex in MEM_GOING_ONLINE and putting it in
>> MEM_CANCEL_ONLINE / MEM_ONLINE when a node is going online.
> 
> Hi guys,
> 
> After a few busy days I have been revisiting this.
> 
> I checked the proposal of slab_mutex spanning GOING_ONLINE <-> ONLINE,
> and I did not see any issue.
> 
> The only concern I had is that we might be calling some slab function from
> {online,offline}_pages() that also takes the mutex.
> I am not aware of any though, and quickly checking did not reveal
> anything either.
> 
> If there is any will be quickly revealed though :-).
> 
> So, unless there is an opposition, I can move forward and see how it
> looks.
> 
> Thoughts?

I feel a bit uneasy about it, while maintaining slab_nodes doesn't seem like
a huge issue to me, so dunno. Maybe David has a better idea now :)