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Date: Fri, 29 Feb 2008 20:15:59 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Max Krasnyanskiy <maxk@qualcomm.com>
Cc: Jason Baron <jbaron@redhat.com>,
       Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>,
       akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
       Rusty Russell <rusty@rustcorp.com.au>,
       Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: [patch 1/2] add ALL_CPUS option to stop_machine_run()
Message-ID: <20080229191559.GA18339@elte.hu>
References: <20080202210828.840735763@polymtl.ca> <20080202211204.268876860@polymtl.ca> <20080226225242.GA15926@redhat.com> <20080227190519.GA14335@Krystal> <20080228163303.GA6195@redhat.com> <47C73121.2000109@qualcomm.com> <20080229090050.GA19519@elte.hu> <47C84DCD.5040803@qualcomm.com>
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* Max Krasnyanskiy <maxk@qualcomm.com> wrote:

> btw Being an RT guy you do not think that stop machine is evil ? [...]

i'm not "an RT guy", -rt is just one of the many projects i've been 
involved with.

and no, i dont think stop machine is "evil" - it's currently the best 
way to do certain things. If you can solve it better then sure, i'm 
awaiting your patches - but the only patch i saw from you so far was the 
one that turned off stop-machine for isolated cpus - which was 
incredibly broken and ignored the problem altogether.

Right now the answer is: "if you want to do hard RT then avoid doing 
things like loading modules". (which you should avoid while doing 
hard-RT anyway)

	Ingo