Commit 6423aa81 authored by Joonsoo Kim's avatar Joonsoo Kim Committed by Linus Torvalds
Browse files

mm/page_alloc.c: recalculate some of node threshold when on/offline memory 

Some of node threshold depends on number of managed pages in the node.
When memory is going on/offline, it can be changed and we need to adjust
them.

Add recalculation to appropriate places and clean-up related functions
for better maintenance.

Link: http://lkml.kernel.org/r/1470724248-26780-2-git-send-email-iamjoonsoo.kim@lge.com


Signed-off-by: default avatarJoonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: default avatarMel Gorman <mgorman@techsingularity.net>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Minchan Kim <minchan@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 81cbcbc2

mm/page_alloc.c

+35 −15
Original line number Diff line number Diff line
@@ -4757,6 +4757,8 @@ int local_memory_node(int node) 
}

#endif



static void setup_min_unmapped_ratio(void);

static void setup_min_slab_ratio(void);

#else	/* CONFIG_NUMA */



static void set_zonelist_order(void)
@@ -5878,9 +5880,6 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat) 
		zone->managed_pages = is_highmem_idx(j) ? realsize : freesize;

#ifdef CONFIG_NUMA

		zone->node = nid;

		pgdat->min_unmapped_pages += (freesize*sysctl_min_unmapped_ratio)

						/ 100;

		pgdat->min_slab_pages += (freesize * sysctl_min_slab_ratio) / 100;

#endif

		zone->name = zone_names[j];

		zone->zone_pgdat = pgdat;
@@ -6801,6 +6800,12 @@ int __meminit init_per_zone_wmark_min(void) 
	setup_per_zone_wmarks();

	refresh_zone_stat_thresholds();

	setup_per_zone_lowmem_reserve();



#ifdef CONFIG_NUMA

	setup_min_unmapped_ratio();

	setup_min_slab_ratio();

#endif



	return 0;

}

core_initcall(init_per_zone_wmark_min)
@@ -6842,16 +6847,10 @@ int watermark_scale_factor_sysctl_handler(struct ctl_table *table, int write, 
}



#ifdef CONFIG_NUMA

int sysctl_min_unmapped_ratio_sysctl_handler(struct ctl_table *table, int write,

	void __user *buffer, size_t *length, loff_t *ppos)

static void setup_min_unmapped_ratio(void)

{

	struct pglist_data *pgdat;

	pg_data_t *pgdat;

	struct zone *zone;

	int rc;



	rc = proc_dointvec_minmax(table, write, buffer, length, ppos);

	if (rc)

		return rc;



	for_each_online_pgdat(pgdat)

		pgdat->min_unmapped_pages = 0;
@@ -6859,26 +6858,47 @@ int sysctl_min_unmapped_ratio_sysctl_handler(struct ctl_table *table, int write, 
	for_each_zone(zone)

		zone->zone_pgdat->min_unmapped_pages += (zone->managed_pages *

				sysctl_min_unmapped_ratio) / 100;

	return 0;

}



int sysctl_min_slab_ratio_sysctl_handler(struct ctl_table *table, int write,



int sysctl_min_unmapped_ratio_sysctl_handler(struct ctl_table *table, int write,

	void __user *buffer, size_t *length, loff_t *ppos)

{

	struct pglist_data *pgdat;

	struct zone *zone;

	int rc;



	rc = proc_dointvec_minmax(table, write, buffer, length, ppos);

	if (rc)

		return rc;



	setup_min_unmapped_ratio();



	return 0;

}



static void setup_min_slab_ratio(void)

{

	pg_data_t *pgdat;

	struct zone *zone;



	for_each_online_pgdat(pgdat)

		pgdat->min_slab_pages = 0;



	for_each_zone(zone)

		zone->zone_pgdat->min_slab_pages += (zone->managed_pages *

				sysctl_min_slab_ratio) / 100;

}



int sysctl_min_slab_ratio_sysctl_handler(struct ctl_table *table, int write,

	void __user *buffer, size_t *length, loff_t *ppos)

{

	int rc;



	rc = proc_dointvec_minmax(table, write, buffer, length, ppos);

	if (rc)

		return rc;



	setup_min_slab_ratio();



	return 0;

}

#endif

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