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
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next prev 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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