linux-kernel - Re: [PATCH 0/9] Containers (V9): Generic Process Containers

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Message-ID: <6599ad830704301009k11100a78we98e20deba9b1fdc@mail.gmail.com>
Date:	Mon, 30 Apr 2007 10:09:38 -0700
From:	"Paul Menage" <menage@...gle.com>
To:	vatsa@...ibm.com, "Paul Jackson" <pj@....com>
Cc:	akpm@...ux-foundation.org, dev@...ru, xemul@...ru,
	serue@...ibm.com, ebiederm@...ssion.com, haveblue@...ibm.com,
	svaidy@...ux.vnet.ibm.com, balbir@...ibm.com,
	ckrm-tech@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	rohitseth@...gle.com, mbligh@...gle.com, containers@...ts.osdl.org,
	devel@...nvz.org
Subject: Re: [PATCH 0/9] Containers (V9): Generic Process Containers

On 4/30/07, Srivatsa Vaddagiri <vatsa@...ibm.com> wrote:
> On Sun, Apr 29, 2007 at 02:37:21AM -0700, Paul Jackson wrote:
> > It builds and boots and mounts the cpuset file system ok.
> > But trying to write the 'mems' file hangs the system hard.
>
> Basically we are attempting a read_lock(&tasklist_lock) in
> container_task_count() after taking write_lock_irq(&tasklist_lock) in
> update_nodemask()!

Paul, is there any reason why we need to do a write_lock() on
tasklist_lock if we're just trying to block fork, or is it just
historical accident? Wouldn't it be fine to do a read_lock()?

Paul
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