linux-kernel - Re: [RFC PATCH] xfs: support for non-mmu architectures

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Message-ID: <CAFLxGvx9x-4gnCQh7203G72Jy+EULbMnGTK=2r3ko=Yy9FB7Wg@mail.gmail.com>
Date:	Fri, 20 Nov 2015 00:54:02 +0100
From:	Richard Weinberger <richard.weinberger@...il.com>
To:	Dave Chinner <david@...morbit.com>
Cc:	Octavian Purdila <octavian.purdila@...el.com>,
	xfs <xfs@....sgi.com>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] xfs: support for non-mmu architectures

On Fri, Nov 20, 2015 at 12:24 AM, Dave Chinner <david@...morbit.com> wrote:
> On Wed, Nov 18, 2015 at 12:46:21AM +0200, Octavian Purdila wrote:
>> Naive implementation for non-mmu architectures: allocate physically
>> contiguous xfs buffers with alloc_pages. Terribly inefficient with
>> memory and fragmentation on high I/O loads but it may be good enough
>> for basic usage (which most non-mmu architectures will need).
>
> Can you please explain why you want to use XFS on low end, basic
> non-MMU devices? XFS is a high performance, enterprise/HPC level
> filesystem - it's not a filesystem designed for small IoT level
> devices - so I'm struggling to see why we'd want to expend any
> effort to make XFS work on such devices....

The use case is the Linux Kernel Library:
https://lkml.org/lkml/2015/11/3/706

Using LKL and fuse you can mount any kernel filesystem using fuse
as non-root.

-- 
Thanks,
//richard
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