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Date: Fri, 28 Sep 2007 13:00:53 -0400 From: Trond Myklebust <trond.myklebust@....uio.no> To: Andrew Morton <akpm@...ux-foundation.org> Cc: Chakri n <chakriin5@...il.com>, linux-pm <linux-pm@...ts.linux-foundation.org>, lkml <linux-kernel@...r.kernel.org>, nfs@...ts.sourceforge.net, Peter Zijlstra <a.p.zijlstra@...llo.nl> Subject: Re: A unresponsive file system can hang all I/O in the system on linux-2.6.23-rc6 (dirty_thresh problem?) On Thu, 2007-09-27 at 23:50 -0700, Andrew Morton wrote: > Actually we perhaps could address this at the VFS level in another way. > Processes which are writing to the dead NFS server will eventually block in > balance_dirty_pages() once they've exceeded the memory limits and will > remain blocked until the server wakes up - that's the behaviour we want. > > What we _don't_ want to happen is for other processes which are writing to > other, non-dead devices to get collaterally blocked. We have patches which > might fix that queued for 2.6.24. Peter? Do these patches also cause the memory reclaimers to steer clear of devices that are congested (and stop waiting on a congested device if they see that it remains congested for a long period of time)? Most of the collateral blocking I see tends to happen in memory allocation... Cheers Trond - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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