[RFC PATCH v3 22/35] mm: Provide a mechanism to request free memory from the region allocator
From: Srivatsa S. Bhat <hidden>
Date: 2013-08-30 13:24:54
Also in:
linux-mm, lkml
Subsystem:
memory management, memory management - page allocator, the rest · Maintainers:
Andrew Morton, Vlastimil Babka, Linus Torvalds
Implement helper functions to request freepages from the region allocator in order to add them to the buddy freelists. For simplicity, all operations related to the region allocator are performed at the granularity of entire memory regions. That is, when the buddy allocator requests freepages from the region allocator, the latter picks a free region and always allocates all the freepages belonging to that entire region. Signed-off-by: Srivatsa S. Bhat <redacted> --- mm/page_alloc.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index d407caf..5b58e7d 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c@@ -938,6 +938,29 @@ static void add_to_region_allocator(struct zone *z, struct free_list *free_list, del_from_freelist_bulk(ralloc_list, free_list, order, region_id); } +/* Delete freepages from the region allocator and add them to buddy freelists */ +static int del_from_region_allocator(struct zone *zone, unsigned int order, + int migratetype) +{ + struct region_allocator *reg_alloc; + struct list_head *ralloc_list; + struct free_list *free_list; + int next_region; + + reg_alloc = &zone->region_allocator; + + next_region = reg_alloc->next_region; + if (next_region < 0) + return -ENOMEM; + + ralloc_list = ®_alloc->region[next_region].region_area[order].list; + free_list = &zone->free_area[order].free_list[migratetype]; + + add_to_freelist_bulk(ralloc_list, free_list, order, next_region); + + return 0; +} + /* * Freeing function for a buddy system allocator. *