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From: Theodore Tso <tytso@mit.edu>
To: Hua Zhong <hzhong@gmail.com>
Cc: "'Linus Torvalds'" <torvalds@linux-foundation.org>,
	"'Jens Axboe'" <jens.axboe@oracle.com>,
	"'Linux Kernel Mailing List'" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 0/8][RFC] IO latency/throughput fixes
Date: Mon, 6 Apr 2009 17:19:31 -0400	[thread overview]
Message-ID: <20090406211931.GB8586@mit.edu> (raw)
In-Reply-To: <002501c9b6f3$f85b4910$e911db30$@com>

On Mon, Apr 06, 2009 at 01:12:08PM -0700, Hua Zhong wrote:
> Grr..making writeback as default would break people's setup that relies on
> the ordered semantics, especially in the embedded world. It's a big no-no.

I've added workarounds for 2.6.30 that provide the replace-via-rename
and replace-via-truncate workarounds for ext3 data=writeback cases.
See commits e7c8f507 and f7ab34ea.  

There won't be an implied fsync for newly created files, yes, but you
could have crashed 5 seconds earlier, at which point you would have
lost the newly created file anyway.  Replace-via-rename and
replace-via-truncate solves the problem for applications which are
editing pre-existing files, which was most of people's complaints
about depending on data=ordered semantics.

						- Ted

  parent reply	other threads:[~2009-04-06 21:19 UTC|newest]

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-04-06 12:48 [PATCH 0/8][RFC] IO latency/throughput fixes Jens Axboe
2009-04-06 12:48 ` [PATCH 1/8] block: change the request allocation/congestion logic to be sync/async based Jens Axboe
2009-04-06 12:48 ` [PATCH 2/8] Add WRITE_SYNC_PLUG and SWRITE_SYNC_PLUG Jens Axboe
2009-04-06 12:48 ` [PATCH 3/8] block: fsync_buffers_list() should use SWRITE_SYNC_PLUG Jens Axboe
2009-04-06 12:48 ` [PATCH 4/8] jbd: use WRITE_SYNC_PLUG instead of WRITE_SYNC Jens Axboe
2009-04-06 12:48 ` [PATCH 5/8] jbd2: " Jens Axboe
2009-04-06 12:48 ` [PATCH 6/8] block: enabling plugging on SSD devices that don't do queuing Jens Axboe
2009-04-06 12:48 ` [PATCH 7/8] block: Add flag for telling the IO schedulers NOT to anticipate more IO Jens Axboe
2009-04-06 12:48 ` [PATCH 8/8] block: switch sync_dirty_buffer() over to WRITE_SYNC Jens Axboe
2009-04-06 13:04 ` [PATCH 0/8][RFC] IO latency/throughput fixes Jens Axboe
2009-04-06 13:13   ` Jens Axboe
2009-04-06 15:37   ` Linus Torvalds
2009-04-06 16:57     ` Jens Axboe
2009-04-07  3:28     ` Chris Mason
2009-04-06 15:04 ` Linus Torvalds
2009-04-06 15:10   ` Jens Axboe
2009-04-06 15:45     ` Linus Torvalds
2009-04-06 17:01       ` Jens Axboe
2009-04-06 18:31       ` Theodore Tso
2009-04-06 19:57         ` Linus Torvalds
2009-04-06 20:10           ` Linus Torvalds
2009-04-06 21:26             ` Theodore Tso
2009-04-06 20:12           ` Hua Zhong
2009-04-06 20:20             ` Linus Torvalds
2009-04-06 21:19             ` Theodore Tso [this message]
2009-04-06 21:35               ` Hua Zhong
2009-04-06 22:04                 ` Ray Lee
2009-04-06 22:17                   ` Linus Torvalds
2009-04-06 23:10                     ` Linus Torvalds
2009-04-07  7:51                       ` Geert Uytterhoeven
2009-04-07 10:36                         ` Ingo Molnar
2009-04-07 14:10                           ` Diego Calleja
2009-04-08 12:04                             ` Ingo Molnar
2009-04-08 12:56                           ` Denys Vlasenko
2009-04-08 13:27                             ` Ingo Molnar
2009-04-07 13:35                       ` Mark Lord
2009-04-07 14:33                         ` Linus Torvalds
2009-04-07 19:24                           ` Mark Lord
2009-04-07 19:45                             ` Jeff Garzik
2009-04-07 20:53                           ` Mike Galbraith
2009-04-09  2:40                       ` Eric Sandeen
2009-04-09 14:01                         ` Ric Wheeler
2009-04-06 22:25                   ` Hua Zhong
2009-04-06 22:48                     ` Ray Lee
2009-04-06 22:52                       ` Hua Zhong
2009-04-06 23:19                       ` Alan Cox
2009-04-07  3:52               ` Chris Mason
2009-04-07  4:13                 ` Trenton D. Adams
2009-04-07  4:27                   ` Linus Torvalds
2009-04-07  4:48                     ` Trenton D. Adams
2009-04-07  5:02                       ` Linus Torvalds
2009-04-07  5:23                         ` Hua Zhong
2009-04-07  6:27                         ` Trenton D. Adams

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