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mm: move buddy list manipulations into helpers

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In preparation for runtime randomization of the zone lists, take all
(well, most of) the list_*() functions in the buddy allocator and put
them in helper functions.  Provide a common control point for injecting
additional behavior when freeing pages.

[dan.j.williams@intel.com: fix buddy list helpers]
  Link: http://lkml.kernel.org/r/155033679702.1773410.13041474192173212653.stgit@dwillia2-desk3.amr.corp.intel.com
[vbabka@suse.cz: remove del_page_from_free_area() migratetype parameter]
  Link: http://lkml.kernel.org/r/4672701b-6775-6efd-0797-b6242591419e@suse.cz
Link: http://lkml.kernel.org/r/154899812264.3165233.5219320056406926223.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Tested-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Robert Elliott <elliott@hpe.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dan Williams 2019-05-14 15:41:32 -07:00 • committed by Linus Torvalds
parent e900a918b0
commit b03641af68
5 changed files with 73 additions and 48 deletions
Download patch file Download diff file Expand all files Collapse all files

46
include/linux/mmzone.h
View file

@ -18,6 +18,8 @@
#include <linux/pageblock-flags.h>
#include <linux/page-flags-layout.h>
#include <linux/atomic.h>
#include <linux/mm_types.h>
#include <linux/page-flags.h>
#include <asm/page.h>
/* Free memory management - zoned buddy allocator. */
@ -98,6 +100,50 @@ struct free_area {
unsigned long nr_free;
};
/* Used for pages not on another list */
static inline void add_to_free_area(struct page *page, struct free_area *area,
int migratetype)
{
list_add(&page->lru, &area->free_list[migratetype]);
area->nr_free++;
}
/* Used for pages not on another list */
static inline void add_to_free_area_tail(struct page *page, struct free_area *area,
int migratetype)
{
list_add_tail(&page->lru, &area->free_list[migratetype]);
area->nr_free++;
}
/* Used for pages which are on another list */
static inline void move_to_free_area(struct page *page, struct free_area *area,
int migratetype)
{
list_move(&page->lru, &area->free_list[migratetype]);
}
static inline struct page *get_page_from_free_area(struct free_area *area,
int migratetype)
{
return list_first_entry_or_null(&area->free_list[migratetype],
struct page, lru);
}
static inline void del_page_from_free_area(struct page *page,
struct free_area *area)
{
list_del(&page->lru);
__ClearPageBuddy(page);
set_page_private(page, 0);
area->nr_free--;
}
static inline bool free_area_empty(struct free_area *area, int migratetype)
{
return list_empty(&area->free_list[migratetype]);
}
struct pglist_data;
/*