linux-kernel - Re: [PATCH RESEND] slab: introduce the flag SLAB_MINIMIZE

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Message-ID: <alpine.DEB.2.20.1804261350500.6674@nuc-kabylake>
Date:   Thu, 26 Apr 2018 13:51:51 -0500 (CDT)
From:   Christopher Lameter <cl@...ux.com>
To:     Mikulas Patocka <mpatocka@...hat.com>
cc:     Mike Snitzer <snitzer@...hat.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Matthew Wilcox <willy@...radead.org>,
        Pekka Enberg <penberg@...nel.org>, linux-mm@...ck.org,
        dm-devel@...hat.com, David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] slab: introduce the flag SLAB_MINIMIZE_WASTE

On Wed, 25 Apr 2018, Mikulas Patocka wrote:

> >
> > Could yo move that logic into slab_order()? It does something awfully
> > similar.
>
> But slab_order (and its caller) limits the order to "max_order" and we
> want more.
>
> Perhaps slab_order should be dropped and calculate_order totally
> rewritten?

Yes you likely need to do something creative with max_order if not with
more stuff.