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SubjectRe: [PATCH 2/2] mm: page_alloc: Do not cache reclaim distances
On 04/08/2014 06:34 AM, Mel Gorman wrote:
> pgdat->reclaim_nodes tracks if a remote node is allowed to be reclaimed by
> zone_reclaim due to its distance. As it is expected that zone_reclaim_mode
> will be rarely enabled it is unreasonable for all machines to take a penalty.
> Fortunately, the zone_reclaim_mode() path is already slow and it is the path
> that takes the hit.
>
> Signed-off-by: Mel Gorman <mgorman@suse.de>

Reviewed-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>

> ---
> include/linux/mmzone.h | 1 -
> mm/page_alloc.c | 15 +--------------
> 2 files changed, 1 insertion(+), 15 deletions(-)
>
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index 9b61b9b..564b169 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -757,7 +757,6 @@ typedef struct pglist_data {
> unsigned long node_spanned_pages; /* total size of physical page
> range, including holes */
> int node_id;
> - nodemask_t reclaim_nodes; /* Nodes allowed to reclaim from */
> wait_queue_head_t kswapd_wait;
> wait_queue_head_t pfmemalloc_wait;
> struct task_struct *kswapd; /* Protected by lock_memory_hotplug() */
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index a256f85..574928e 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -1863,16 +1863,7 @@ static bool zone_local(struct zone *local_zone, struct zone *zone)
>
> static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone)
> {
> - return node_isset(local_zone->node, zone->zone_pgdat->reclaim_nodes);
> -}
> -
> -static void __paginginit init_zone_allows_reclaim(int nid)
> -{
> - int i;
> -
> - for_each_online_node(i)
> - if (node_distance(nid, i) <= RECLAIM_DISTANCE)
> - node_set(i, NODE_DATA(nid)->reclaim_nodes);
> + return node_distance(zone_to_nid(local_zone), zone_to_nid(zone)) < RECLAIM_DISTANCE;
> }
>
> #else /* CONFIG_NUMA */
> @@ -1906,9 +1897,6 @@ static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone)
> return true;
> }
>
> -static inline void init_zone_allows_reclaim(int nid)
> -{
> -}
> #endif /* CONFIG_NUMA */
>
> /*
> @@ -4917,7 +4905,6 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size,
>
> pgdat->node_id = nid;
> pgdat->node_start_pfn = node_start_pfn;
> - init_zone_allows_reclaim(nid);
> #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
> get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
> #endif
>


--
Thanks.
Zhang Yanfei


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