linux-kernel - Re: [RFC] cpuset relative memory policies

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Message-ID: <Pine.LNX.4.64.0710311157310.21799@schroedinger.engr.sgi.com>
Date:	Wed, 31 Oct 2007 11:59:42 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Paul Jackson <pj@....com>
cc:	David Rientjes <rientjes@...gle.com>, Lee.Schermerhorn@...com,
	linux-kernel@...r.kernel.org, Andi Kleen <ak@...e.de>
Subject: Re: [RFC] cpuset relative memory policies - second choice

On Tue, 30 Oct 2007, Paul Jackson wrote:

>  #include <linux/mmzone.h>
> @@ -64,13 +72,18 @@ struct mm_struct;
>  struct mempolicy {
>  	atomic_t refcnt;
>  	short policy; 	/* See MPOL_* above */
> +	char mpol_nodemask_mode; /* See MPOL_MODE_* above; union c below */

Make both policy and the mode char? Could we shorten the mpol_nodemask_mode 
to mode?

> --- 2.6.23-mm1.orig/include/linux/sched.h	2007-10-30 18:04:11.000000000 -0700
> +++ 2.6.23-mm1/include/linux/sched.h	2007-10-30 18:11:07.000000000 -0700
> @@ -1112,6 +1112,7 @@ struct task_struct {
>  #ifdef CONFIG_NUMA
>    	struct mempolicy *mempolicy;
>  	short il_next;
> +	char mpol_nodemask_mode; /* new mem policies will get this mode */

Hmmm... I would rather have numactl manage this flag and specify it in 
calls to set memory policies.

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