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From: Miklos Szeredi <miklos@szeredi.hu>
To: akpm@linux-foundation.org
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: dirty balancing deadlock
Date: Mon, 19 Feb 2007 01:45:06 +0100	[thread overview]
Message-ID: <E1HIweQ-0005RQ-00@dorka.pomaz.szeredi.hu> (raw)
In-Reply-To: <E1HIwLJ-0005N4-00@dorka.pomaz.szeredi.hu> (message from Miklos Szeredi on Mon, 19 Feb 2007 01:25:21 +0100)

> > > > If so, writes to B will decrease the dirty memory threshold.
> > > 
> > > Yes, but not by enough.  Say A dirties a 1100 pages, limit is 1000.
> > > Some pages queued for writeback (doesn't matter how much).  B writes
> > > back 1, 1099 dirty remain in A, zero in B.  balance_dirty_pages() for
> > > B doesn't know that there's nothing more to write back for B, it's
> > > just waiting there for those 1099, which'll never get written.
> > 
> > hm, OK, arguable.  I guess something like this..
> 
> Doesn't help the fuse case, but does seem to help the loopback mount
> one.

No sorry, it doesn't even help the loopback deadlock.  It sometimes
takes quite a while to trigger...

Miklos

  parent reply	other threads:[~2007-02-19  0:45 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 [this message]
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
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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