From: "hch@infradead.org" <hch@infradead.org>
To: NeilBrown <neilb@suse.de>
Cc: Jens Axboe <jaxboe@fusionio.com>,
Mike Snitzer <snitzer@redhat.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"hch@infradead.org" <hch@infradead.org>,
"dm-devel@redhat.com" <dm-devel@redhat.com>,
"linux-raid@vger.kernel.org" <linux-raid@vger.kernel.org>
Subject: Re: [PATCH 05/10] block: remove per-queue plugging
Date: Mon, 18 Apr 2011 17:30:48 -0400 [thread overview]
Message-ID: <20110418213048.GA21852@infradead.org> (raw)
In-Reply-To: <20110418183343.036f412e@notabene.brown>
> md: provide generic support for handling unplug callbacks.
This looks like some horribly ugly code to me. The real fix is to do
the plugging in the block layers for bios instead of requests. The
effect should be about the same, except that merging will become a
little easier as all bios will be on the list now when calling into
__make_request or it's equivalent, and even better if we extent the
list sort callback to also sort by the start block it will actually
simplify the merge algorithm a lot as it only needs to do front merges
and no back merges for the on-stack merging.
In addition it should also allow for much more optimal queue_lock
roundtrips - we can keep it locked at the end of what's currently
__make_request to have it available for the next bio that's been
on the list. If it either can be merged now that we have the lock
and/or we optimize get_request_wait not to sleep in the fast path
we could get down to a single queue_lock roundtrip for each unplug.
next prev parent reply other threads:[~2011-04-18 21:30 UTC|newest]
Thread overview: 152+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-22 1:17 [PATCH 0/10] On-stack explicit block queue plugging Jens Axboe
2011-01-22 1:17 ` [PATCH 01/10] block: add API for delaying work/request_fn a little bit Jens Axboe
2011-01-22 1:17 ` [PATCH 02/10] ide-cd: convert to blk_delay_queue() for a short pause Jens Axboe
2011-01-22 1:19 ` David Miller
2011-01-22 1:17 ` [PATCH 03/10] scsi: convert to blk_delay_queue() Jens Axboe
2011-01-22 1:17 ` [PATCH 04/10] block: initial patch for on-stack per-task plugging Jens Axboe
2011-01-24 19:36 ` Jeff Moyer
2011-01-24 21:23 ` Jens Axboe
2011-03-10 16:54 ` Vivek Goyal
2011-03-10 19:32 ` Jens Axboe
2011-03-10 19:46 ` Vivek Goyal
2011-03-16 8:18 ` Shaohua Li
2011-03-16 17:31 ` Vivek Goyal
2011-03-17 1:00 ` Shaohua Li
2011-03-17 3:19 ` Shaohua Li
2011-03-17 9:44 ` Jens Axboe
2011-03-18 1:55 ` Shaohua Li
2011-03-17 9:43 ` Jens Axboe
2011-03-18 6:36 ` Shaohua Li
2011-03-18 12:54 ` Jens Axboe
2011-03-18 13:52 ` Jens Axboe
2011-03-21 6:52 ` Shaohua Li
2011-03-21 9:20 ` Jens Axboe
2011-03-22 0:32 ` Shaohua Li
2011-03-22 7:36 ` Jens Axboe
2011-03-17 9:39 ` Jens Axboe
2011-01-22 1:17 ` [PATCH 05/10] block: remove per-queue plugging Jens Axboe
2011-01-22 1:31 ` Nick Piggin
2011-03-03 21:23 ` Mike Snitzer
2011-03-03 21:27 ` Mike Snitzer
2011-03-03 22:13 ` Mike Snitzer
2011-03-04 13:02 ` Shaohua Li
2011-03-04 13:20 ` Jens Axboe
2011-03-04 21:43 ` Mike Snitzer
2011-03-04 21:50 ` Jens Axboe
2011-03-04 22:27 ` Mike Snitzer
2011-03-05 20:54 ` Jens Axboe
2011-03-07 10:23 ` Peter Zijlstra
2011-03-07 19:43 ` Jens Axboe
2011-03-07 20:41 ` Peter Zijlstra
2011-03-07 20:46 ` Jens Axboe
2011-03-08 9:38 ` Peter Zijlstra
2011-03-08 9:41 ` Jens Axboe
2011-03-07 0:54 ` Shaohua Li
2011-03-07 8:07 ` Jens Axboe
2011-03-08 12:16 ` Jens Axboe
2011-03-08 20:21 ` Mike Snitzer
2011-03-08 20:27 ` Jens Axboe
2011-03-08 21:36 ` Jeff Moyer
2011-03-09 7:25 ` Jens Axboe
2011-03-08 22:05 ` Mike Snitzer
2011-03-10 0:58 ` Mike Snitzer
2011-04-05 3:05 ` NeilBrown
2011-04-11 4:50 ` NeilBrown
2011-04-11 9:19 ` Jens Axboe
2011-04-11 10:59 ` NeilBrown
2011-04-11 11:04 ` Jens Axboe
2011-04-11 11:26 ` NeilBrown
2011-04-11 11:37 ` Jens Axboe
2011-04-11 12:05 ` NeilBrown
2011-04-11 12:11 ` Jens Axboe
2011-04-11 12:36 ` NeilBrown
2011-04-11 12:48 ` Jens Axboe
2011-04-12 1:12 ` hch
2011-04-12 8:36 ` Jens Axboe
2011-04-12 12:22 ` Dave Chinner
2011-04-12 12:28 ` Jens Axboe
2011-04-12 12:41 ` Dave Chinner
2011-04-12 12:58 ` Jens Axboe
2011-04-12 13:31 ` Dave Chinner
2011-04-12 13:45 ` Jens Axboe
2011-04-12 14:34 ` Dave Chinner
2011-04-12 21:08 ` NeilBrown
2011-04-13 2:23 ` Linus Torvalds
2011-04-13 11:12 ` Peter Zijlstra
2011-04-13 11:23 ` Jens Axboe
2011-04-13 11:41 ` Peter Zijlstra
2011-04-13 15:13 ` Linus Torvalds
2011-04-13 17:35 ` Jens Axboe
2011-04-12 16:58 ` hch
2011-04-12 17:29 ` Jens Axboe
2011-04-12 16:44 ` hch
2011-04-12 16:49 ` Jens Axboe
2011-04-12 16:54 ` hch
2011-04-12 17:24 ` Jens Axboe
2011-04-12 13:40 ` Dave Chinner
2011-04-12 13:48 ` Jens Axboe
2011-04-12 23:35 ` Dave Chinner
2011-04-12 16:50 ` hch
2011-04-15 4:26 ` hch
2011-04-15 6:34 ` Jens Axboe
2011-04-17 22:19 ` NeilBrown
2011-04-18 4:19 ` NeilBrown
2011-04-18 6:38 ` Jens Axboe
2011-04-18 7:25 ` NeilBrown
2011-04-18 8:10 ` Jens Axboe
2011-04-18 8:33 ` NeilBrown
2011-04-18 8:42 ` Jens Axboe
2011-04-18 21:23 ` hch
2011-04-22 15:39 ` hch
2011-04-22 16:01 ` Vivek Goyal
2011-04-22 16:10 ` Vivek Goyal
2011-04-18 21:30 ` hch [this message]
2011-04-18 22:38 ` NeilBrown
2011-04-20 10:55 ` hch
2011-04-18 9:19 ` hch
2011-04-18 9:40 ` [dm-devel] " Hannes Reinecke
2011-04-18 9:47 ` Jens Axboe
2011-04-18 9:46 ` Jens Axboe
2011-04-11 11:55 ` NeilBrown
2011-04-11 12:12 ` Jens Axboe
2011-04-11 22:58 ` hch
2011-04-12 6:20 ` Jens Axboe
2011-04-11 16:59 ` hch
2011-04-11 21:14 ` NeilBrown
2011-04-11 22:59 ` hch
2011-04-12 6:18 ` Jens Axboe
2011-03-17 15:51 ` Mike Snitzer
2011-03-17 18:31 ` Jens Axboe
2011-03-17 18:46 ` Mike Snitzer
2011-03-18 9:15 ` hch
2011-03-08 12:15 ` Jens Axboe
2011-03-04 4:00 ` Vivek Goyal
2011-03-08 12:24 ` Jens Axboe
2011-03-08 22:10 ` blk-throttle: Use blk_plug in throttle code (Was: Re: [PATCH 05/10] block: remove per-queue plugging) Vivek Goyal
2011-03-09 7:26 ` Jens Axboe
2011-01-22 1:17 ` [PATCH 06/10] block: kill request allocation batching Jens Axboe
2011-01-22 9:31 ` Christoph Hellwig
2011-01-24 19:09 ` Jens Axboe
2011-01-22 1:17 ` [PATCH 07/10] fs: make generic file read/write functions plug Jens Axboe
2011-01-24 3:57 ` Dave Chinner
2011-01-24 19:11 ` Jens Axboe
2011-03-04 4:09 ` Vivek Goyal
2011-03-04 13:22 ` Jens Axboe
2011-03-04 13:25 ` hch
2011-03-04 13:40 ` Jens Axboe
2011-03-04 14:08 ` hch
2011-03-04 22:07 ` Jens Axboe
2011-03-04 23:12 ` hch
2011-03-08 12:38 ` Jens Axboe
2011-03-09 10:38 ` hch
2011-03-09 10:52 ` Jens Axboe
2011-01-22 1:17 ` [PATCH 08/10] read-ahead: use plugging Jens Axboe
2011-01-22 1:17 ` [PATCH 09/10] fs: make mpage read/write_pages() plug Jens Axboe
2011-01-22 1:17 ` [PATCH 10/10] fs: make aio plug Jens Axboe
2011-01-24 17:59 ` Jeff Moyer
2011-01-24 19:09 ` Jens Axboe
2011-01-24 19:15 ` Jeff Moyer
2011-01-24 19:22 ` Jens Axboe
2011-01-24 19:29 ` Jeff Moyer
2011-01-24 19:31 ` Jens Axboe
2011-01-24 19:38 ` Jeff Moyer
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