linux-kernel - Re: [PATCH 6/9] mm, page_alloc: simplify zonelist initialization

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Message-ID: <20170714095534.53hpbi6uaszbtx5h@suse.de>
Date:   Fri, 14 Jul 2017 10:55:34 +0100
From:   Mel Gorman <mgorman@...e.de>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        LKML <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH 6/9] mm, page_alloc: simplify zonelist initialization

On Fri, Jul 14, 2017 at 10:00:03AM +0200, Michal Hocko wrote:
>  
>  	zonelist = &pgdat->node_zonelists[ZONELIST_NOFALLBACK];
> -	j = build_zonelists_node(pgdat, zonelist, 0);
> -	zonelist->_zonerefs[j].zone = NULL;
> -	zonelist->_zonerefs[j].zone_idx = 0;
> +	zoneref_idx = build_zonelists_node(pgdat, zonelist, zoneref_idx);
> +	zonelist->_zonerefs[zoneref_idx].zone = NULL;
> +	zonelist->_zonerefs[zoneref_idx].zone_idx = 0;
>  }
>  
>  /*
> @@ -4946,21 +4949,13 @@ static void build_thisnode_zonelists(pg_data_t *pgdat)
>   * exhausted, but results in overflowing to remote node while memory
>   * may still exist in local DMA zone.
>   */
> -static int node_order[MAX_NUMNODES];
>  
>  static void build_zonelists(pg_data_t *pgdat)
>  {
> -	int i, node, load;
> +	static int node_order[MAX_NUMNODES];
> +	int node, load, i = 0;

Emm, node_order can be large. The first distro config I checked
indicated that this is 8K. I got hung up on that part and didn't look
closely at the rest of the patch.

-- 
Mel Gorman
SUSE Labs