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Commit 5f7a75ac authored by Mel Gorman's avatar Mel Gorman Committed by Linus Torvalds
Browse files

mm: page_alloc: do not cache reclaim distances 



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: default avatarMel Gorman <mgorman@suse.de>
Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Reviewed-by: default avatarZhang Yanfei <zhangyanfei@cn.fujitsu.com>
Acked-by: default avatarMichal Hocko <mhocko@suse.cz>
Reviewed-by: default avatarChristoph Lameter <cl@linux.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 4f9b16a6

include/linux/mmzone.h

+0 −1
Original line number Diff line number Diff line
@@ -763,7 +763,6 @@ 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() */

mm/page_alloc.c

+2 −15
Original line number Diff line number Diff line
@@ -1850,16 +1850,8 @@ 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_node_state(i, N_MEMORY)

		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 */
@@ -1893,9 +1885,6 @@ 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 */



/*
@@ -4933,8 +4922,6 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size, 


	pgdat->node_id = nid;

	pgdat->node_start_pfn = node_start_pfn;

	if (node_state(nid, N_MEMORY))

		init_zone_allows_reclaim(nid);

#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP

	get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);

#endif