linux-kernel - Re: [RFC PATCH] mm, slob: Rewrite SLOB using segregated free list

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Message-ID: <alpine.DEB.2.22.394.2110250957040.2528@gentwo.de>
Date:   Mon, 25 Oct 2021 09:58:54 +0200 (CEST)
From:   Christoph Lameter <cl@...two.de>
To:     Hyeonggon Yoo <42.hyeyoo@...il.com>
cc:     Vlastimil Babka <vbabka@...e.cz>, linux-kernel@...r.kernel.org,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        Matthew Wilcox <willy@...radead.org>,
        Dave Taht <dave.taht@...il.com>
Subject: Re: [RFC PATCH] mm, slob: Rewrite SLOB using segregated free list

On Thu, 21 Oct 2021, Hyeonggon Yoo wrote:

> But on the contrary, I wonder when SLOB is useful than SLUB.
> is it for really tiny linux systems that has under 1M of RAM?
> But can linux be that small?

SLOB I think is mainly a nice intro into how slab allocators work. It is a
simple architecture and the code is to read and therefore easily
understood. I heard of some use cases from  others but I have only ever
been able to run a kernel boot in KVM with SLOB.