linux-kernel - Re: [PATCH 3/5] mm/slab: Do not call kmalloc

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Date:   Mon, 21 Feb 2022 15:53:39 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Hyeonggon Yoo <42.hyeyoo@...il.com>
Cc:     linux-mm@...ck.org, Roman Gushchin <guro@...com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>, linux-kernel@...r.kernel.org,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        David Rientjes <rientjes@...gle.com>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>
Subject: Re: [PATCH 3/5] mm/slab: Do not call kmalloc_large() for unsupported
 size

On Mon, Feb 21, 2022 at 10:53:34AM +0000, Hyeonggon Yoo wrote:
> SLAB's kfree() does not support freeing an object that is allocated from
> kmalloc_large(). Fix this as SLAB do not pass requests larger than
> KMALLOC_MAX_CACHE_SIZE directly to page allocator.

I was wondering if we wanted to go in the other direction and get rid of
kmalloc cache sizes larger than, say, 64kB from the SLAB allocator.