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From:   Andreas Dilger <adilger@dilger.ca>
Message-Id: <1FC3646C-259F-4AA4-B7E0-B13E19EDC595@dilger.ca>
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Subject: Re: Discontiguous folios/pagesets
Date:   Sat, 28 Aug 2021 13:27:29 -0600
In-Reply-To: <YSqIry5dKg+kqAxJ@casper.infradead.org>
Cc:     Johannes Weiner <hannes@cmpxchg.org>,
        "Darrick J. Wong" <darrick.wong@oracle.com>,
        linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
To:     Matthew Wilcox <willy@infradead.org>
References: <YSqIry5dKg+kqAxJ@casper.infradead.org>
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On Aug 28, 2021, at 1:04 PM, Matthew Wilcox <willy@infradead.org> wrote:
> 
> The current folio work is focused on permitting the VM to use
> physically contiguous chunks of memory.  Both Darrick and Johannes
> have pointed out the advantages of supporting logically-contiguous,
> physically-discontiguous chunks of memory.  Johannes wants to be able to
> use order-0 allocations to allocate larger folios, getting the benefit
> of managing the memory in larger chunks without requiring the memory
> allocator to be able to find contiguous chunks.  Darrick wants to support
> non-power-of-two block sizes.

What is the use case for non-power-of-two block sizes?  The main question
is whether that use case is important enough to add the complexity and
overhead in order to support it?

Cheers, Andreas


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