Re: nfsd oops on Linus' current tree.

From: Tejun Heo
Date: Thu Jan 03 2013 - 17:08:10 EST


On Thu, Jan 03, 2013 at 03:11:20PM -0500, J. Bruce Fields wrote:
> Both rpciod and nfsiod already set WQ_MEM_RECLAIM.
> But, right, looking at kernel/workqueue.c, it seems that the dedicated
> "rescuer" threads are invoked only in the case when work is stalled
> because a new worker thread isn't allocated quickly enough.

Because that's the *only* case where progress can't be guaranteed

> So, what to do that's simplest enough that it would work for
> post-rc2/stable? I was happy having just a simple dedicated
> thread--these are only started when nfsd is, so there's no real thread
> proliferation problem.

The analysis is likely completely wrong, so please don't go off doing
something unnecessary. Please take look at what's causing the
deadlocks again.


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