linux-kernel - Re: [PATCH 2/8] Change alloc_pages_vma to pass down the policy node for local policy

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Date:	Tue, 22 Feb 2011 09:42:58 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Andi Kleen <andi@...stfloor.org>
cc:	akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, aarcange@...hat.com,
	lwoodman@...hat.com, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 2/8] Change alloc_pages_vma to pass down the policy node
 for local policy

On Mon, 21 Feb 2011, Andi Kleen wrote:

> --- a/mm/mempolicy.c
> +++ b/mm/mempolicy.c
> @@ -1524,10 +1524,9 @@ static nodemask_t *policy_nodemask(gfp_t gfp, struct mempolicy *policy)
>  }
>
>  /* Return a zonelist indicated by gfp for node representing a mempolicy */
> -static struct zonelist *policy_zonelist(gfp_t gfp, struct mempolicy *policy)
> +static struct zonelist *policy_zonelist(gfp_t gfp, struct mempolicy *policy,
> +	int nd)
>  {
> -	int nd = numa_node_id();
> -
>  	switch (policy->mode) {
>  	case MPOL_PREFERRED:
>  		if (!(policy->flags & MPOL_F_LOCAL))
> @@ -1679,7 +1678,7 @@ struct zonelist *huge_zonelist(struct vm_area_struct *vma, unsigned long addr,
>  		zl = node_zonelist(interleave_nid(*mpol, vma, addr,
>  				huge_page_shift(hstate_vma(vma))), gfp_flags);
>  	} else {
> -		zl = policy_zonelist(gfp_flags, *mpol);
> +		zl = policy_zonelist(gfp_flags, *mpol, numa_node_id());
>  		if ((*mpol)->mode == MPOL_BIND)
>  			*nodemask = &(*mpol)->v.nodes;
>  	}

If we do that then why not also consolidate the MPOL_INTERLEAVE
treatment also in policy_zonelist()? Looks awfully similar now and Would
simplify the code and likely get rid of some functions.

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