linux-ext4 - Re: Ordered mode rewrite patch

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Date:	Fri, 25 Apr 2008 11:23:21 -0300
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Jan Kara <jack@...e.cz>
Cc:	Nathan Grennan <jack@...nusx-1.org>, linux-ext4@...r.kernel.org
Subject: Re: Ordered mode rewrite patch

Hi Jan,

On Tue, Apr 08, 2008 at 02:11:49PM +0200, Jan Kara wrote:
>   Hello,
> 
>   attached is a jumbo patch that reverses locking order of transaction
> start and page lock in ext3 and rewrites handling of ordered data mode in
> JBD and ext3. Note that the patch will break compilation of ext4 and OCFS2.
> The patch survives LTP run on my test machine so it shouldn't eat your data
> immediately but bugs are of course possible...
>   I'm very interested in any results (both positive and negative) you could
> get with it :). Thanks for testing it.
> 
> 									Honza
> 
> PS: CCing also linux-ext4 list in case there are some other interested
> testers. Next on my todo list is to port this for ext4...

No luck for my testcase, similar fsync behaviour taking several seconds:

vim           D 0000000000000000     0  4088   4036
 ffff81017a143da8 0000000000000086 0000000000000000 ffffffff80236808
 ffff81022f272830 ffff81022f1ca730 ffff81022f272a70 0000000600000001
 00000000ffffffff 0000000000000003 0000000000000000 0000000000000000
Call Trace:
 [<ffffffff80236808>] lock_timer_base+0x26/0x4b
 [<ffffffff802f8c00>] log_wait_commit+0x9f/0xed
 [<ffffffff8023f7b1>] autoremove_wake_function+0x0/0x2e
 [<ffffffff802f4dbf>] journal_stop+0x165/0x18d
 [<ffffffff8029a7d9>] __writeback_single_inode+0x17f/0x29d
 [<ffffffff8023f7b1>] autoremove_wake_function+0x0/0x2e
 [<ffffffff8029b10a>] sync_inode+0x24/0x32
 [<ffffffff802e5602>] ext3_sync_file+0x8a/0x9c
 [<ffffffff8029d532>] do_fsync+0x52/0xa4
 [<ffffffff8029d5a7>] __do_fsync+0x23/0x36
 [<ffffffff8020b0ab>] system_call_after_swapgs+0x7b/0x80

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