diff options
Diffstat (limited to 'mm/page_alloc.c')
| -rw-r--r-- | mm/page_alloc.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 676aec93d69..e1d87ee1d9c 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -765,6 +765,23 @@ int move_freepages_block(struct zone *zone, struct page *page, int migratetype) return move_freepages(zone, start_page, end_page, migratetype); } +/* Return the page with the lowest PFN in the list */ +static struct page *min_page(struct list_head *list) +{ + unsigned long min_pfn = -1UL; + struct page *min_page = NULL, *page;; + + list_for_each_entry(page, list, lru) { + unsigned long pfn = page_to_pfn(page); + if (pfn < min_pfn) { + min_pfn = pfn; + min_page = page; + } + } + + return min_page; +} + /* Remove an element from the buddy allocator from the fallback list */ static struct page *__rmqueue_fallback(struct zone *zone, int order, int start_migratetype) @@ -795,8 +812,11 @@ retry: if (list_empty(&area->free_list[migratetype])) continue; + /* Bias kernel allocations towards low pfns */ page = list_entry(area->free_list[migratetype].next, struct page, lru); + if (unlikely(start_migratetype != MIGRATE_MOVABLE)) + page = min_page(&area->free_list[migratetype]); area->nr_free--; /* |