linux-kernel - Re: [PATCH 22/27] mm: Convert zone_reclaim to node

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Date:	Fri, 17 Jun 2016 12:55:11 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Mel Gorman <mgorman@...hsingularity.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>
Cc:	Rik van Riel <riel@...riel.com>,
	Johannes Weiner <hannes@...xchg.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 22/27] mm: Convert zone_reclaim to node_reclaim

On 06/09/2016 08:04 PM, Mel Gorman wrote:
> As reclaim is now per-node based, convert zone_reclaim to be node_reclaim.
> It is possible that a node will be reclaimed multiple times if it has
> multiple zones but this is unavoidable without caching all nodes traversed
> so far.  The documentation and interface to userspace is the same from
> a configuration perspective and will will be similar in behaviour unless
> the node-local allocation requests were also limited to lower zones.
>
> Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>

Acked-by: Vlastimil Babka <vbabka@...e.cz>

[...]

> @@ -682,6 +674,14 @@ typedef struct pglist_data {
>  	 */
>  	unsigned long		totalreserve_pages;
>
> +#ifdef CONFIG_NUMA
> +	/*
> +	 * zone reclaim becomes active if more unmapped pages exist.

            node reclaim

> +	 */
> +	unsigned long		min_unmapped_pages;
> +	unsigned long		min_slab_pages;
> +#endif /* CONFIG_NUMA */
> +
>  	/* Write-intensive fields used from the page allocator */
>  	ZONE_PADDING(_pad1_)
>  	spinlock_t		lru_lock;

[...]

> @@ -3580,7 +3580,7 @@ static inline unsigned long node_unmapped_file_pages(struct pglist_data *pgdat)
>  }
>
>  /* Work out how many page cache pages we can reclaim in this reclaim_mode */
> -static unsigned long zone_pagecache_reclaimable(struct zone *zone)
> +static unsigned long zone_pagecache_reclaimable(struct pglist_data *pgdat)

Rename to node_pagecache_reclaimable?