From 387ba26fb1cb9be9e35dc14a6d97188e916eda05 Mon Sep 17 00:00:00 2001 From: Mel Gorman Date: Thu, 29 Apr 2021 23:01:45 -0700 Subject: mm/page_alloc: add a bulk page allocator This patch adds a new page allocator interface via alloc_pages_bulk, and __alloc_pages_bulk_nodemask. A caller requests a number of pages to be allocated and added to a list. The API is not guaranteed to return the requested number of pages and may fail if the preferred allocation zone has limited free memory, the cpuset changes during the allocation or page debugging decides to fail an allocation. It's up to the caller to request more pages in batch if necessary. Note that this implementation is not very efficient and could be improved but it would require refactoring. The intent is to make it available early to determine what semantics are required by different callers. Once the full semantics are nailed down, it can be refactored. [mgorman@techsingularity.net: fix alloc_pages_bulk() return type, per Matthew] Link: https://lkml.kernel.org/r/20210325123713.GQ3697@techsingularity.net [mgorman@techsingularity.net: fix uninit var warning] Link: https://lkml.kernel.org/r/20210330114847.GX3697@techsingularity.net [mgorman@techsingularity.net: fix comment, per Vlastimil] Link: https://lkml.kernel.org/r/20210412110255.GV3697@techsingularity.net Link: https://lkml.kernel.org/r/20210325114228.27719-3-mgorman@techsingularity.net Signed-off-by: Mel Gorman Acked-by: Vlastimil Babka Reviewed-by: Alexander Lobakin Tested-by: Colin Ian King Cc: Alexander Duyck Cc: Christoph Hellwig Cc: Chuck Lever Cc: David Miller Cc: Ilias Apalodimas Cc: Jesper Dangaard Brouer Cc: Matthew Wilcox (Oracle) Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/gfp.h | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'include') diff --git a/include/linux/gfp.h b/include/linux/gfp.h index 0a88f84b08f4..a2be8f4174a9 100644 --- a/include/linux/gfp.h +++ b/include/linux/gfp.h @@ -518,6 +518,17 @@ static inline int arch_make_page_accessible(struct page *page) struct page *__alloc_pages(gfp_t gfp, unsigned int order, int preferred_nid, nodemask_t *nodemask); +unsigned long __alloc_pages_bulk(gfp_t gfp, int preferred_nid, + nodemask_t *nodemask, int nr_pages, + struct list_head *list); + +/* Bulk allocate order-0 pages */ +static inline unsigned long +alloc_pages_bulk(gfp_t gfp, unsigned long nr_pages, struct list_head *list) +{ + return __alloc_pages_bulk(gfp, numa_mem_id(), NULL, nr_pages, list); +} + /* * Allocate pages, preferring the node given as nid. The node must be valid and * online. For more general interface, see alloc_pages_node(). -- cgit v1.2.3