linux-kernel - Re: [RFC v3 2/4] mm: move PG_slab flag to page

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Message-ID: <59630801-42b4-22e8-0ef6-5a5b8636dfbd@redhat.com>
Date:   Fri, 3 Feb 2023 17:04:01 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Matthew Wilcox <willy@...radead.org>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>
Cc:     Vlastimil Babka <vbabka@...e.cz>, 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>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        HORIGUCHI NAOYA(堀口 直也) 
        <naoya.horiguchi@....com>, Joe Perches <joe@...ches.com>,
        Petr Mladek <pmladek@...e.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>
Subject: Re: [RFC v3 2/4] mm: move PG_slab flag to page_type

On 30.01.23 06:11, Matthew Wilcox wrote:
> On Mon, Jan 30, 2023 at 01:34:59PM +0900, Hyeonggon Yoo wrote:
>>> Seems like quite some changes to page_type to accomodate SLAB, which is
>>> hopefully going away soon(TM). Could we perhaps avoid that?
>>
>> If it could be done with less changes, I'll try to avoid that.
> 
> Let me outline the idea I had for removing PG_slab:
> 
> Observe that PG_reserved and PG_slab are mutually exclusive.  Also,

I recall that there are SetPageReserved() calls on pages allocated via slab.

-- 
Thanks,

David / dhildenb