From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Jens Axboe <jens.axboe@oracle.com>
Cc: linux-kernel@vger.kernel.org, chris.mason@oracle.com,
linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH][RFC] fast file mapping for loop
Date: Thu, 10 Jan 2008 12:42:25 +1100 [thread overview]
Message-ID: <200801101242.25671.nickpiggin@yahoo.com.au> (raw)
In-Reply-To: <20080109085231.GE6650@kernel.dk>
On Wednesday 09 January 2008 19:52, Jens Axboe wrote:
> So how does it work? Instead of punting IO to a thread and passing it
> through the page cache, we instead attempt to send the IO directly to the
> filesystem block that it maps to.
You told Christoph that just using direct-IO from kernel still doesn't
give you the required behaviour... What about queueing the IO directly
*and* using direct-IO? I guess it still has to go through the underlying
filesystem, but that's probably a good thing.
> loop maintains a prio tree of known
> extents in the file (populated lazily on demand, as needed).
Just a quick question (I haven't looked closely at the code): how come
you are using a prio tree for extents? I don't think they could be
overlapping?
next prev parent reply other threads:[~2008-01-10 1:42 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-09 8:52 [PATCH][RFC] fast file mapping for loop Jens Axboe
2008-01-09 9:31 ` Christoph Hellwig
2008-01-09 9:43 ` Jens Axboe
2008-01-09 11:00 ` Chris Mason
2008-01-09 15:34 ` Andi Kleen
2008-01-10 8:43 ` Jens Axboe
2008-01-09 23:16 ` Alasdair G Kergon
2008-01-10 8:31 ` Jens Axboe
2008-01-10 8:42 ` Jens Axboe
2008-01-11 7:39 ` Mikulas Patocka
2008-01-11 7:58 ` Jens Axboe
2008-01-10 12:47 ` Chris Mason
2008-01-10 12:57 ` Jens Axboe
2008-01-10 23:01 ` Neil Brown
2008-01-11 14:21 ` Chris Mason
2008-01-10 1:42 ` Nick Piggin [this message]
2008-01-10 8:34 ` Jens Axboe
2008-01-10 8:37 ` Christoph Hellwig
2008-01-10 8:44 ` Jens Axboe
2008-01-10 8:54 ` Christoph Hellwig
2008-01-10 9:01 ` Jens Axboe
2008-01-10 12:53 ` Chris Mason
2008-01-10 13:03 ` Jens Axboe
2008-01-10 13:46 ` Chris Mason
2008-01-10 9:37 ` Peter Zijlstra
2008-01-10 9:49 ` Jens Axboe
2008-01-10 9:52 ` Peter Zijlstra
2008-01-10 10:02 ` Jens Axboe
2008-01-10 10:20 ` Peter Zijlstra
2008-01-11 1:25 ` Bill Davidsen
2008-01-11 18:17 ` Daniel Phillips
2008-01-11 18:23 ` Jens Axboe
2008-01-14 17:10 ` Chris Mason
2008-01-14 17:54 ` Jens Axboe
2008-01-15 9:25 ` Jens Axboe
2008-01-15 9:36 ` Jens Axboe
2008-01-15 10:07 ` Jens Axboe
2008-01-15 14:04 ` Chris Mason
-- strict thread matches above, loose matches on Subject: below --
2008-01-09 23:43 devzero
2008-01-09 23:53 ` Alasdair G Kergon
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