linux-kernel - Re: [patch 1/2] add ALL_CPUS option to stop_machine

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Message-ID: <47C73121.2000109@qualcomm.com>
Date:	Thu, 28 Feb 2008 14:09:37 -0800
From:	Max Krasnyanskiy <maxk@...lcomm.com>
To:	Jason Baron <jbaron@...hat.com>
CC:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	akpm@...ux-foundation.org, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org, Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [patch 1/2] add ALL_CPUS option to stop_machine_run()

Jason Baron wrote:
> -allow stop_mahcine_run() to call a function on all cpus. Calling 
>  stop_machine_run() with a 'ALL_CPUS' invokes this new behavior.
>  stop_machine_run() proceeds as normal until the calling cpu has
>  invoked 'fn'. Then, we tell all the other cpus to call 'fn'.
> 

Jason, we're actually trying to reduce the usage of the stop_machine in 
general. It's a very big hammer that kills latencies and stuff. It'd be nice 
if we did not introduce any more dependencies on it. I guess in some case 
there is simply no other way to handle what need to do. But please think twice
(or more :)).

Max


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