From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH V8 00/33] loop: Issue O_DIRECT aio using bio_vec
Date: Tue, 30 Jul 2013 14:28:20 -0700
Message-ID: <20130730142820.313f1af6827276df31913106@linux-foundation.org>
References: <1374774659-13121-1-git-send-email-dave.kleikamp@oracle.com>
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Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	"Maxim V. Patlasov" <mpatlasov@parallels.com>,
	Zach Brown <zab@zabbo.net>
To: Dave Kleikamp <dave.kleikamp@oracle.com>
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On Thu, 25 Jul 2013 12:50:26 -0500 Dave Kleikamp <dave.kleikamp@oracle.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?