diff options
| -rw-r--r-- | mm/page_alloc.c | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 03fef8d987f..676aec93d69 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -159,8 +159,13 @@ EXPORT_SYMBOL(nr_node_ids); #endif #ifdef CONFIG_PAGE_GROUP_BY_MOBILITY +int page_group_by_mobility_disabled __read_mostly; + static inline int get_pageblock_migratetype(struct page *page) { + if (unlikely(page_group_by_mobility_disabled)) + return MIGRATE_UNMOVABLE; + return get_pageblock_flags_group(page, PB_migrate, PB_migrate_end); } @@ -174,6 +179,9 @@ static inline int allocflags_to_migratetype(gfp_t gfp_flags, int order) { WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK); + if (unlikely(page_group_by_mobility_disabled)) + return MIGRATE_UNMOVABLE; + /* Cluster high-order atomic allocations together */ if (unlikely(order > 0) && (!(gfp_flags & __GFP_WAIT) || in_interrupt())) @@ -2375,9 +2383,23 @@ void build_all_zonelists(void) /* cpuset refresh routine should be here */ } vm_total_pages = nr_free_pagecache_pages(); - printk("Built %i zonelists in %s order. Total pages: %ld\n", + /* + * Disable grouping by mobility if the number of pages in the + * system is too low to allow the mechanism to work. It would be + * more accurate, but expensive to check per-zone. This check is + * made on memory-hotadd so a system can start with mobility + * disabled and enable it later + */ + if (vm_total_pages < (MAX_ORDER_NR_PAGES * MIGRATE_TYPES)) + page_group_by_mobility_disabled = 1; + else + page_group_by_mobility_disabled = 0; + + printk("Built %i zonelists in %s order, mobility grouping %s. " + "Total pages: %ld\n", num_online_nodes(), zonelist_order_name[current_zonelist_order], + page_group_by_mobility_disabled ? "off" : "on", vm_total_pages); #ifdef CONFIG_NUMA printk("Policy zone: %s\n", zone_names[policy_zone]); |