linux-kernel - Re: [PATCH v2 3/6] mm, page_alloc: pass preferred nid instead of zonelist to allocator

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Message-ID: <alpine.DEB.2.20.1705171009340.8714@east.gentwo.org>
Date:   Wed, 17 May 2017 10:19:13 -0500 (CDT)
From:   Christoph Lameter <cl@...ux.com>
To:     Vlastimil Babka <vbabka@...e.cz>
cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
        cgroups@...r.kernel.org, Li Zefan <lizefan@...wei.com>,
        Michal Hocko <mhocko@...nel.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        David Rientjes <rientjes@...gle.com>,
        Hugh Dickins <hughd@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Dimitri Sivanich <sivanich@....com>
Subject: Re: [PATCH v2 3/6] mm, page_alloc: pass preferred nid instead of
 zonelist to allocator

On Wed, 17 May 2017, Vlastimil Babka wrote:

>  struct page *
> -__alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
> -		       struct zonelist *zonelist, nodemask_t *nodemask);
> +__alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, int preferred_nid,
> +							nodemask_t *nodemask);
>
>  static inline struct page *
> -__alloc_pages(gfp_t gfp_mask, unsigned int order,
> -		struct zonelist *zonelist)
> +__alloc_pages(gfp_t gfp_mask, unsigned int order, int preferred_nid)
>  {
> -	return __alloc_pages_nodemask(gfp_mask, order, zonelist, NULL);
> +	return __alloc_pages_nodemask(gfp_mask, order, preferred_nid, NULL);
>  }

Maybe use nid instead of preferred_nid like in __alloc_pages? Otherwise
there may be confusion with the MPOL_PREFER policy.

> @@ -1963,8 +1960,8 @@ alloc_pages_vma(gfp_t gfp, int order, struct vm_area_struct *vma,
>  {
>  	struct mempolicy *pol;
>  	struct page *page;
> +	int preferred_nid;
>  	unsigned int cpuset_mems_cookie;
> -	struct zonelist *zl;
>  	nodemask_t *nmask;

Same here.

> @@ -4012,8 +4012,8 @@ static inline void finalise_ac(gfp_t gfp_mask,
>   * This is the 'heart' of the zoned buddy allocator.
>   */
>  struct page *
> -__alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
> -			struct zonelist *zonelist, nodemask_t *nodemask)
> +__alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, int preferred_nid,
> +							nodemask_t *nodemask)
>  {

and here

This looks clean to me. Still feel a bit uneasy about this since I do
remember that we had a reason to use zonelists instead of nodes back then
but cannot remember what that reason was....

CCing Dimitri at SGI. This may break a lot of legacy SGIapps. If you read
this Dimitri then please review this patchset and the discussions around
it.

Reviewed-by: Christoph Lameter <cl@...ux.com>