linux-kernel - Re: [PATCH] add init_start_cpus to config boot cpus -v2

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Message-Id: <20081214015556.16615d55.akpm@linux-foundation.org>
Date:	Sun, 14 Dec 2008 01:55:56 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] add init_start_cpus to config boot cpus -v2

On Sat, 13 Dec 2008 23:28:36 -0800 Yinghai Lu <yinghai@...nel.org> wrote:

> 
> Impact: new command line
> 
> so could select cpus to be started during init stage.

I already knew that :(


> example:
> init_start_cpus=2,4,6
> to start core 0 only on every node or thread 0 or all cores
> 
> init_start_cpus=0
> not start other APs, and later let user to use
>  echo 1 > /sys/devices/cpu/cpu2
> to start them in user space.
> 

But why?  Why is this useful?  Why did you even bother writing the
code?  Who wants this?  For what reason?  What value has it?

This stuff matters.

> +static __initdata cpumask_var_t cpu_init_start_mask;

OK.

I also suggested that this code not be added in init/main.c.  What
happened to that idea?


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