From: Sedat Dilek <sedat.dilek@gmail.com>
To: Dave Chinner <david@fromorbit.com>,
Dave Kleikamp <dave.kleikamp@oracle.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
"Maxim V. Patlasov" <mpatlasov@parallels.com>,
Zach Brown <zab@zabbo.net>,
Stephen Rothwell <sfr@canb.auug.org.au>,
Al Viro <viro@zeniv.linux.org.uk>
Subject: Re: [PATCH V8 00/33] loop: Issue O_DIRECT aio using bio_vec
Date: Wed, 31 Jul 2013 08:40:16 +0200 [thread overview]
Message-ID: <CA+icZUWcCv3X6GE6kMmGKcizgfMNeUErbPW_+ihbke3UL6KD3g@mail.gmail.com> (raw)
In-Reply-To: <20130731004303.GA7118@dastard>
On Wed, Jul 31, 2013 at 2:43 AM, Dave Chinner <david@fromorbit.com> wrote:
> On Tue, Jul 30, 2013 at 02:28:20PM -0700, Andrew Morton wrote:
>> 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?
>>
[ CC Al and Linux-next maintainer ]
The more important question how to test and then provide performance numbers.
If you give me a test-case I give you numbers!
>> Does anyone care much about loop performance? What's the value here?
>
> Yes. Anyone using loopback devices for file-backed devices exposed
> to containers and VMs cares about the memory and CPU overhead
> the double caching the existing loop device has.
>
Yupp, I am here on Ubuntu/precise AMD64 in a so-called WUBI
environment which makes intensive usage of loopback-device plus FUSE
driver and $fs-of-your-choice (here: ext4).
Today, I have pulled Dave's aio_loop GIT branch into v3.11-rc3.
After successful compilation I am running it right now.
I had also tested v6 of the series [1] from February 2013 and
encouraged Dave to put it into Linux-next [2].
Unfortunately, there was no response from Al.
Again, Dave try to get it into Linux-next!
- Sedat -
[1] http://marc.info/?t=135947707100013&r=1&w=4
[2] http://marc.info/?l=linux-fsdevel&m=136122569807203&w=4
next prev parent reply other threads:[~2013-07-31 6:40 UTC|newest]
Thread overview: 92+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-25 17:50 [PATCH V8 00/33] loop: Issue O_DIRECT aio using bio_vec Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 01/33] iov_iter: move into its own file Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 02/33] iov_iter: iov_iter_copy_from_user() should use non-atomic copy Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 03/33] iov_iter: add copy_to_user support Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 04/33] iov_iter: add __iovec_copy_to_user() Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 05/33] fuse: convert fuse to use iov_iter_copy_[to|from]_user Dave Kleikamp
2013-07-25 17:50 ` Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 06/33] iov_iter: hide iovec details behind ops function pointers Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 07/33] iov_iter: ii_iovec_copy_to_user should pre-fault user pages Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 08/33] iov_iter: add bvec support Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 09/33] iov_iter: add a shorten call Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 10/33] iov_iter: let callers extract iovecs and bio_vecs Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 11/33] dio: Convert direct_IO to use iov_iter Dave Kleikamp
2013-08-23 15:48 ` Geert Uytterhoeven
2013-08-23 15:48 ` Geert Uytterhoeven
2013-07-25 17:50 ` [PATCH V8 12/33] dio: add bio_vec support to __blockdev_direct_IO() Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 13/33] fs: pull iov_iter use higher up the stack Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 14/33] aio: add aio_kernel_() interface Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 15/33] aio: add aio support for iov_iter arguments Dave Kleikamp
2013-08-21 13:55 ` Benjamin LaHaise
2013-08-30 20:05 ` Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 16/33] bio: add bvec_length(), like iov_length() Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 17/33] loop: use aio to perform io on the underlying file Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 18/33] fs: create file_readable() and file_writable() functions Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 19/33] fs: use read_iter and write_iter rather than aio_read and aio_write Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 20/33] fs: add read_iter and write_iter to several file systems Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 21/33] ocfs2: add support for read_iter and write_iter Dave Kleikamp
2013-07-25 17:50 ` [Ocfs2-devel] " Dave Kleikamp
2013-07-25 17:50 ` Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 22/33] ext4: " Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 23/33] nfs: add support for read_iter, write_iter Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 24/33] nfs: simplify swap Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 25/33] btrfs: add support for read_iter and write_iter Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 26/33] block_dev: add support for read_iter, write_iter Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 27/33] xfs: add support for read_iter and write_iter Dave Kleikamp
2013-07-25 17:50 ` Dave Kleikamp
2013-07-26 11:51 ` Dave Chinner
2013-07-26 11:51 ` Dave Chinner
2013-07-25 17:50 ` [PATCH V8 28/33] gfs2: Convert aio_read/write ops to read/write_iter Dave Kleikamp
2013-07-25 17:50 ` [Cluster-devel] " Dave Kleikamp
2013-07-25 17:50 ` Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 29/33] udf: convert file ops from aio_read/write " Dave Kleikamp
2013-07-25 21:34 ` Jan Kara
2013-07-25 17:50 ` [PATCH V8 30/33] afs: add support for read_iter and write_iter Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 31/33] ecrpytfs: Convert aio_read/write ops to read/write_iter Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 32/33] ubifs: convert file ops from aio_read/write " Dave Kleikamp
2013-07-25 17:50 ` Dave Kleikamp
2013-07-25 17:50 ` Dave Kleikamp
2013-07-25 17:50 ` [PATCH V8 33/33] tmpfs: add support for read_iter and write_iter Dave Kleikamp
2013-07-30 21:28 ` [PATCH V8 00/33] loop: Issue O_DIRECT aio using bio_vec Andrew Morton
2013-07-31 0:43 ` Dave Chinner
2013-07-31 6:40 ` Sedat Dilek [this message]
2013-07-31 8:41 ` Sedat Dilek
2013-07-31 11:22 ` Sedat Dilek
2013-07-31 9:51 ` Maxim Patlasov
2013-08-01 8:58 ` Christoph Hellwig
2013-08-01 13:04 ` Dave Kleikamp
2013-08-02 10:48 ` Christoph Hellwig
2013-08-20 13:00 ` Christoph Hellwig
2013-08-20 19:13 ` Dave Kleikamp
2013-08-21 0:14 ` Stephen Rothwell
2013-08-21 5:35 ` Sedat Dilek
2013-08-20 22:46 ` Andrew Morton
2013-08-21 13:02 ` Benjamin LaHaise
2013-08-21 13:02 ` Benjamin LaHaise
2013-08-21 16:30 ` Dave Kleikamp
2013-08-21 16:30 ` Dave Kleikamp
2013-08-21 16:39 ` Benjamin LaHaise
2013-08-21 16:39 ` Benjamin LaHaise
2013-08-21 17:12 ` Dave Kleikamp
2013-08-21 17:12 ` Dave Kleikamp
2013-08-21 19:30 ` Andrew Morton
2013-08-21 19:30 ` Andrew Morton
2013-08-21 20:24 ` Benjamin LaHaise
2013-08-21 20:24 ` Benjamin LaHaise
2013-10-14 15:07 ` Christoph Hellwig
2013-10-14 21:29 ` Benjamin LaHaise
2013-10-14 21:29 ` Benjamin LaHaise
2013-10-15 16:55 ` Christoph Hellwig
2013-10-15 17:14 ` Benjamin LaHaise
2013-10-15 17:14 ` Benjamin LaHaise
2013-10-15 17:18 ` Christoph Hellwig
2013-10-15 17:18 ` Christoph Hellwig
2013-10-15 17:53 ` Dave Kleikamp
2013-10-15 17:53 ` Dave Kleikamp
2014-12-31 20:38 ` Sedat Dilek
2014-12-31 21:52 ` Dave Kleikamp
2014-12-31 22:35 ` Sedat Dilek
2015-01-01 0:52 ` Ming Lei
2015-01-05 19:24 ` Maxim Patlasov
2015-01-06 13:18 ` Ming Lei
2015-01-10 16:51 ` Ming Lei
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