linux-kernel - Re: [PATCH V8 00/33] loop: Issue O_DIRECT aio using bio

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Message-Id: <20130730142820.313f1af6827276df31913106@linux-foundation.org>
Date:	Tue, 30 Jul 2013 14:28:20 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Dave Kleikamp <dave.kleikamp@...cle.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	"Maxim V. Patlasov" <mpatlasov@...allels.com>,
	Zach Brown <zab@...bo.net>
Subject: Re: [PATCH V8 00/33] loop: Issue O_DIRECT aio using bio_vec

On Thu, 25 Jul 2013 12:50:26 -0500 Dave Kleikamp <dave.kleikamp@...cle.com> wrote:

> This patch series adds a kernel interface to fs/aio.c so that kernel code can
> issue concurrent asynchronous IO to file systems.  It adds an aio command and
> file system methods which specify io memory with pages instead of userspace
> addresses.
> 
> This series was written to reduce the current overhead loop imposes by
> performing synchronus buffered file system IO from a kernel thread.  These
> patches turn loop into a light weight layer that translates bios into iocbs.

Do you have any performance numbers?

Does anyone care much about loop performance?  What's the value here?
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