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From: Miklos Szeredi <miklos@szeredi.hu>
To: chris.mason@oracle.com
Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
	linux-mm@kvack.org
Subject: Re: dirty balancing deadlock
Date: Mon, 19 Feb 2007 02:14:15 +0100	[thread overview]
Message-ID: <E1HIx6d-0005V4-00@dorka.pomaz.szeredi.hu> (raw)
In-Reply-To: <20070219010102.GC9289@think.oraclecorp.com> (message from Chris Mason on Sun, 18 Feb 2007 20:01:02 -0500)

> > > In general, writepage is supposed to do work without blocking on
> > > expensive locks that will get pdflush and dirty reclaim stuck in this
> > > fashion.  You'll probably have to take the same approach reiserfs does
> > > in data=journal mode, which is leaving the page dirty if fuse_get_req_wp
> > > is going to block without making progress.
> > 
> > Pdflush, and dirty reclaim set wbc->nonblocking to true.
> > balance_dirty_pages and fsync don't.  The problem here is that
> > Andrew's patch is wrong to let balance_dirty_pages() try to write back
> > pages from a different queue.
> 
> async or sync, writepage is supposed to either make progress or bail.
> loopback aside, if the fuse call is blocking long term, you're going to
> run into problems.

Hmm, like what?

Thanks,
Miklos

  reply	other threads:[~2007-02-19  1:15 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-18 18:28 Miklos Szeredi
2007-02-18 20:53 ` Andrew Morton
2007-02-18 21:25   ` Rik van Riel
2007-02-18 22:54     ` Miklos Szeredi
2007-02-18 22:50   ` Miklos Szeredi
2007-02-18 22:59     ` Andrew Morton
2007-02-18 23:22       ` Miklos Szeredi
2007-02-18 23:59         ` Andrew Morton
2007-02-19  0:25           ` Miklos Szeredi
2007-02-19  0:30             ` Miklos Szeredi
2007-02-19  0:45             ` Miklos Szeredi
2007-02-19  0:45             ` Chris Mason
2007-02-19  0:54               ` Miklos Szeredi
2007-02-19  1:01                 ` Chris Mason
2007-02-19  1:14                   ` Miklos Szeredi [this message]
2007-02-20  0:16                     ` Chris Mason
2007-02-20  8:53                       ` Miklos Szeredi
2007-02-19 17:11           ` Miklos Szeredi
2007-02-19 23:12             ` Miklos Szeredi
2007-02-20  0:13             ` Chris Mason
2007-02-20  8:47               ` Miklos Szeredi
2007-02-20 11:30                 ` Chris Mason
2007-02-21 21:36             ` Andrew Morton
2007-02-22  7:42               ` Miklos Szeredi
2007-02-22  7:55                 ` Andrew Morton
2007-02-22  8:02                   ` Miklos Szeredi

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