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From: Andrew Morton <akpm@osdl.org>
To: ego@in.ibm.com
Cc: mingo@elte.hu, linux-kernel@vger.kernel.org, torvalds@osdl.org,
	davej@redhat.com, dipankar@in.ibm.com, vatsa@in.ibm.com
Subject: Re: CPUFREQ-CPUHOTPLUG: Possible circular locking dependency
Date: Wed, 29 Nov 2006 13:05:56 -0800	[thread overview]
Message-ID: <20061129130556.d20c726e.akpm@osdl.org> (raw)
In-Reply-To: <20061129152404.GA7082@in.ibm.com>

On Wed, 29 Nov 2006 20:54:04 +0530
Gautham R Shenoy <ego@in.ibm.com> wrote:

> Ok, so to cut the long story short, 
> - While changing governor from anything to
> ondemand, locks are taken in the following order
> 
> policy->lock ===> dbs_mutex ===> workqueue_mutex.
> 
> - While offlining a cpu, locks are taken in the following order
> 
> cpu_add_remove_lock ==> sched_hotcpu_mutex ==> workqueue_mutex ==
> ==> cache_chain_mutex ==> policy->lock.

What functions are taking all these locks?  (ie: the callpath?)

  reply	other threads:[~2006-11-29 21:06 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-11-29 15:24 Gautham R Shenoy
2006-11-29 21:05 ` Andrew Morton [this message]
2006-11-30  4:28   ` Gautham R Shenoy
2006-11-30  6:35     ` Gautham R Shenoy
2006-11-30  8:29       ` Ingo Molnar
2006-11-30  8:52         ` Gautham R Shenoy
2006-12-01  1:43         ` Gautham R Shenoy
2006-12-01  8:55           ` Ingo Molnar
2006-11-30  8:31 ` Ingo Molnar
2006-11-30 10:24   ` Gautham R Shenoy
2006-11-30 11:03     ` Ingo Molnar
2006-11-30 11:19       ` Andrew Morton
2006-11-30 11:46         ` Ingo Molnar
2006-11-30 12:44           ` Gautham R Shenoy
2006-11-30 14:35             ` Ingo Molnar
2006-11-30 19:40           ` Andrew Morton
2006-11-30 20:24             ` Ingo Molnar
2006-11-30 11:43       ` Gautham R Shenoy
2006-11-30 11:53         ` Ingo Molnar
2006-11-30 12:19           ` Gautham R Shenoy
2006-12-06 18:27 Pallipadi, Venkatesh
2006-12-07  7:06 ` Gautham R Shenoy
2006-12-07 12:50 Pallipadi, Venkatesh

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