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Date: Wed, 21 May 2008 12:59:37 +0200 From: Peter Zijlstra <a.p.zijlstra@...llo.nl> To: Louis Rilling <Louis.Rilling@...labs.com> Cc: Arjan van de Ven <arjan@...radead.org>, Joel Becker <Joel.Becker@...cle.com>, linux-kernel@...r.kernel.org, ocfs2-devel@....oracle.com Subject: Re: [RFC][PATCH 0/3] configfs: Make nested default groups lockdep-friendly On Wed, 2008-05-21 at 12:25 +0200, Louis Rilling wrote: > > http://programming.kicks-ass.net/kernel-patches/concurrent-pagecache/23-rc1-rt/radix-concurrent-lockdep.patch > > Thanks for pointing this out. > > Yes this could solve part of the issue, at the price of duplicating the > inode mutex class. However, this still does not solve the issue when > deleting config_groups, since in that case all nodes of the tree are > locked. Thinking about adding lockdep support for concurrent locking of > the direct children of a node in a tree... Why doesn't sysfs have this problem? - the code says configfs was derived from sysfs. Also, do you really need to hold all locks when removing something? sound like a bit overdone. Also realise there is a maximum number of held locks - various people have already requested it to be increased or made dynamic. We're reluctant in doing so because we feel lock chains should not be of unlimited length. The deeper the chains the bigger the PI overhead etc.. As to modifying lockdep - it currently doesn't know about trees and teaching it about them isn't easy. -- 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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