linux-kernel - Re: endless sync on bdi_sched

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Message-Id: <201004081312.06018.nuclearcat@nuclearcat.com>
Date:	Thu, 8 Apr 2010 13:12:05 +0300
From:	Denys Fedorysychenko <nuclearcat@...learcat.com>
To:	Jan Kara <jack@...e.cz>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: endless sync on bdi_sched_wait()? 2.6.33.1

> > SUPERPROXY ~ # cat /proc/1753/stack
> > [<c019a93c>] bdi_sched_wait+0x8/0xc
> > [<c019a807>] wait_on_bit+0x20/0x2c
> > [<c019a9af>] sync_inodes_sb+0x6f/0x10a
> > [<c019dd53>] __sync_filesystem+0x28/0x49
> > [<c019ddf3>] sync_filesystems+0x7f/0xc0
> > [<c019de7a>] sys_sync+0x1b/0x2d
> > [<c02f7a25>] syscall_call+0x7/0xb
> > [<ffffffff>] 0xffffffff
> 
>   Hmm, I guess you are observing the problem reported in
> https://bugzilla.kernel.org/show_bug.cgi?id=14830
>   There seem to be several issues in the per-bdi writeback code that
> cause sync on a busy filesystem to last almost forever. To that bug are
> attached two patches that fix two issues but apparently it's not all.
> I'm still looking into it...
> 
> 								Honza
> 
Hi

Thanks for info, i will try to test them as soon as i finish with my current 
issues, and kernel will reach at least rc5, because servers where i test - 
loaded and production.
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