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From: Mike Galbraith <efault@gmx.de>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mark Lord <lkml@rtr.ca>, Ray Lee <ray-lk@madrabbit.org>,
	Hua Zhong <hzhong@gmail.com>, Theodore Tso <tytso@mit.edu>,
	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: Tue, 07 Apr 2009 22:53:51 +0200	[thread overview]
Message-ID: <1239137631.5638.56.camel@marge.simson.net> (raw)
In-Reply-To: <alpine.LFD.2.00.0904070727260.4010@localhost.localdomain>

On Tue, 2009-04-07 at 07:33 -0700, Linus Torvalds wrote:
> 
> On Tue, 7 Apr 2009, Mark Lord wrote:
> > 
> > What happens with ext3 "writeback", and ext4 "whatever",
> > when one does the quickie reboot method:
> > 
> >   ALT-SYSRQ-S ALT-SYSRQ-U ALT-SYSRQ-S ALT-SYSRQ-B
> > 
> > ???
> 
> Since 's' syncs (I think 'u' does too, as part of making things 
> read-only), the data blocks will be on disk after the boot regardless of 
> any other ordering.
> 
> Of course, it will leave all your lock-files files alone, and I can almost 
> guarantee that some daemons (read: "NetworkManager") will then fail on the 
> next boot because they think they are already running.

I don't do that _regularly_, but have had cause to do so many times over
the last couple years since switching to data=writeback.  Box boots up
fine here, at least with opensuse 10.3 and 11.0 it does.

I've had to reconfigure evolution, and some desktop settings a few times
after pulling the _eject_ handle (plain sysrq-b or BRB if kernel is
having a bad hair day), but that's about it.

	-Mike


  parent reply	other threads:[~2009-04-07 20:54 UTC|newest]

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-04-06 12:48 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
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 [this message]
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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