The page allocator needs to be able to detect events such as the first page allocation in a new region etc, in order to make smart decisions to aid memory power management. So add the necessary support to accurately track allocations on a per-region basis.
Signed-off-by: Srivatsa S. Bhat <[email protected]> --- include/linux/mmzone.h | 2 + mm/page_alloc.c | 66 ++++++++++++++++++++++++++++++++++++------------ 2 files changed, 51 insertions(+), 17 deletions(-) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 0258c68..6e209e9 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -86,6 +86,7 @@ static inline int get_pageblock_migratetype(struct page *page) struct mem_region_list { struct list_head *page_block; unsigned long nr_free; + struct zone_mem_region *zone_region; }; struct free_list { @@ -341,6 +342,7 @@ struct zone_mem_region { unsigned long end_pfn; unsigned long present_pages; unsigned long spanned_pages; + unsigned long nr_free; }; struct zone { diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 52d8a59..541e4ab 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -625,7 +625,8 @@ out: return prev_region_id; } -static void add_to_freelist(struct page *page, struct free_list *free_list) +static void add_to_freelist(struct page *page, struct free_list *free_list, + int order) { struct list_head *prev_region_list, *lru; struct mem_region_list *region; @@ -636,6 +637,7 @@ static void add_to_freelist(struct page *page, struct free_list *free_list) region = &free_list->mr_list[region_id]; region->nr_free++; + region->zone_region->nr_free += 1 << order; if (region->page_block) { list_add_tail(lru, region->page_block); @@ -690,9 +692,10 @@ out: * inside the freelist. */ static void rmqueue_del_from_freelist(struct page *page, - struct free_list *free_list) + struct free_list *free_list, int order) { struct list_head *lru = &page->lru; + struct mem_region_list *mr_list; int region_id; #ifdef CONFIG_DEBUG_PAGEALLOC @@ -703,7 +706,10 @@ static void rmqueue_del_from_freelist(struct page *page, list_del(lru); /* Fastpath */ - if (--(free_list->next_region->nr_free)) { + mr_list = free_list->next_region; + mr_list->zone_region->nr_free -= 1 << order; + + if (--(mr_list->nr_free)) { #ifdef CONFIG_DEBUG_PAGEALLOC WARN(free_list->next_region->nr_free < 0, @@ -725,7 +731,8 @@ static void rmqueue_del_from_freelist(struct page *page, } /* Generic delete function for region-aware buddy allocator. */ -static void del_from_freelist(struct page *page, struct free_list *free_list) +static void del_from_freelist(struct page *page, struct free_list *free_list, + int order) { struct list_head *prev_page_lru, *lru, *p; struct mem_region_list *region; @@ -735,11 +742,12 @@ static void del_from_freelist(struct page *page, struct free_list *free_list) /* Try to fastpath, if deleting from the head of the list */ if (lru == free_list->list.next) - return rmqueue_del_from_freelist(page, free_list); + return rmqueue_del_from_freelist(page, free_list, order); region_id = page_zone_region_id(page); region = &free_list->mr_list[region_id]; region->nr_free--; + region->zone_region->nr_free -= 1 << order; #ifdef CONFIG_DEBUG_PAGEALLOC WARN(region->nr_free < 0, "%s: nr_free is negative\n", __func__); @@ -794,10 +802,10 @@ page_found: * Move a given page from one freelist to another. */ static void move_page_freelist(struct page *page, struct free_list *old_list, - struct free_list *new_list) + struct free_list *new_list, int order) { - del_from_freelist(page, old_list); - add_to_freelist(page, new_list); + del_from_freelist(page, old_list, order); + add_to_freelist(page, new_list, order); } /* @@ -863,7 +871,8 @@ static inline void __free_one_page(struct page *page, migratetype); } else { area = &zone->free_area[order]; - del_from_freelist(buddy, &area->free_list[migratetype]); + del_from_freelist(buddy, &area->free_list[migratetype], + order); area->nr_free--; rmv_page_order(buddy); } @@ -898,12 +907,13 @@ static inline void __free_one_page(struct page *page, * switch off this entire "is next-higher buddy free?" * logic when memory regions are used. */ - add_to_freelist(page, &area->free_list[migratetype]); + add_to_freelist(page, &area->free_list[migratetype], + order); goto out; } } - add_to_freelist(page, &area->free_list[migratetype]); + add_to_freelist(page, &area->free_list[migratetype], order); out: area->nr_free++; } @@ -1136,7 +1146,8 @@ static inline void expand(struct zone *zone, struct page *page, continue; } #endif - add_to_freelist(&page[size], &area->free_list[migratetype]); + add_to_freelist(&page[size], &area->free_list[migratetype], + high); area->nr_free++; set_page_order(&page[size], high); } @@ -1203,7 +1214,8 @@ struct page *__rmqueue_smallest(struct zone *zone, unsigned int order, page = list_entry(area->free_list[migratetype].list.next, struct page, lru); - rmqueue_del_from_freelist(page, &area->free_list[migratetype]); + rmqueue_del_from_freelist(page, &area->free_list[migratetype], + current_order); rmv_page_order(page); area->nr_free--; expand(zone, page, order, current_order, area, migratetype); @@ -1276,7 +1288,7 @@ int move_freepages(struct zone *zone, old_mt = get_freepage_migratetype(page); area = &zone->free_area[order]; move_page_freelist(page, &area->free_list[old_mt], - &area->free_list[migratetype]); + &area->free_list[migratetype], order); set_freepage_migratetype(page, migratetype); page += 1 << order; pages_moved += 1 << order; @@ -1374,7 +1386,8 @@ __rmqueue_fallback(struct zone *zone, int order, int start_migratetype) } /* Remove the page from the freelists */ - del_from_freelist(page, &area->free_list[migratetype]); + del_from_freelist(page, &area->free_list[migratetype], + current_order); rmv_page_order(page); /* Take ownership for orders >= pageblock_order */ @@ -1728,7 +1741,7 @@ static int __isolate_free_page(struct page *page, unsigned int order) /* Remove page from free list */ mt = get_freepage_migratetype(page); - del_from_freelist(page, &zone->free_area[order].free_list[mt]); + del_from_freelist(page, &zone->free_area[order].free_list[mt], order); zone->free_area[order].nr_free--; rmv_page_order(page); @@ -5017,6 +5030,22 @@ static void __meminit init_node_memory_regions(struct pglist_data *pgdat) pgdat->nr_node_regions = idx; } +static void __meminit zone_init_free_lists_late(struct zone *zone) +{ + struct mem_region_list *mr_list; + int order, t, i; + + for_each_migratetype_order(order, t) { + for (i = 0; i < zone->nr_zone_regions; i++) { + mr_list = + &zone->free_area[order].free_list[t].mr_list[i]; + + mr_list->nr_free = 0; + mr_list->zone_region = &zone->zone_regions[i]; + } + } +} + static void __meminit init_zone_memory_regions(struct pglist_data *pgdat) { unsigned long start_pfn, end_pfn, absent; @@ -5064,6 +5093,8 @@ static void __meminit init_zone_memory_regions(struct pglist_data *pgdat) z->nr_zone_regions = idx; + zone_init_free_lists_late(z); + /* * Revisit the last visited node memory region, in case it * spans multiple zones. @@ -6474,7 +6505,8 @@ __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) pfn, 1 << order, end_pfn); #endif mt = get_freepage_migratetype(page); - del_from_freelist(page, &zone->free_area[order].free_list[mt]); + del_from_freelist(page, &zone->free_area[order].free_list[mt], + order); rmv_page_order(page); zone->free_area[order].nr_free--; for (i = 0; i < (1 << order); i++) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
