From: David Miller <davem@davemloft.net>
To: jeremy@goop.org
Cc: mingo@elte.hu, peterz@infradead.org,
linux-kernel@vger.kernel.org, rusty@rustcorp.com.au
Subject: Re: combinatorial explosion in lockdep
Date: Mon, 28 Jul 2008 15:56:51 -0700 (PDT) [thread overview]
Message-ID: <20080728.155651.71572255.davem@davemloft.net> (raw)
In-Reply-To: <488E4D1C.8000906@goop.org>
From: Jeremy Fitzhardinge <jeremy@goop.org>
Date: Mon, 28 Jul 2008 15:50:04 -0700
> David Miller wrote:
> > The triggering event seems to be kstopmachine as done by the first
> > module load. This seems to create the situation where we do double RQ
> > locking on essentially all the run queues, in order to move the
> > kstopmachine threads around to their proprer cpus. I think this is
> > what starts to make the lockdep dependency chains huge.
> >
>
> Does Rusty's stop_machine rewrite which puts the threads on the correct
> cpus to start with at least mitigate the symptoms?
I could check that, but it won't keep this from happening
and being triggerable by a trivial userland program setting
scheduler affinities.
next prev parent reply other threads:[~2008-07-28 22:56 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-28 22:37 David Miller
2008-07-28 22:50 ` Jeremy Fitzhardinge
2008-07-28 22:56 ` David Miller [this message]
2008-07-28 23:13 ` David Miller
2008-07-28 23:51 ` Ingo Molnar
2008-07-29 0:44 ` David Miller
2008-07-30 4:45 ` David Miller
2008-07-30 6:56 ` David Miller
2008-07-30 7:21 ` Peter Zijlstra
2008-07-30 7:19 ` Peter Zijlstra
2008-07-30 11:15 ` Peter Zijlstra
2008-07-31 16:50 ` [stable] " Greg KH
2008-07-30 11:26 ` [PATCH] lockdep: change scheduler annotation Peter Zijlstra
2008-07-30 11:34 ` David Miller
2008-07-31 16:34 ` Ingo Molnar
2008-07-31 16:39 ` combinatorial explosion in lockdep Ingo Molnar
2008-08-01 9:22 ` Ingo Molnar
2008-08-01 9:32 ` David Miller
2008-08-01 11:57 ` Hugh Dickins
2008-08-03 8:14 ` David Miller
2008-08-04 12:21 ` Hugh Dickins
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