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FROMLIST: BACKPORT: mm/page_alloc: Add page->buddy_list and page->pcp_list

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The page allocator uses page->lru for storing pages on either buddy or
PCP lists. Create page->buddy_list and page->pcp_list as a union with
page->lru. This is simply to clarify what type of list a page is on
in the page allocator.

No functional change intended.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Link: https://lore.kernel.org/all/20220420095906.27349-2-mgorman@techsingularity.net/

Bug: 230899966
Signed-off-by: Minchan Kim <minchan@google.com>
Change-Id: Ieef253fa28c2a411008da64b38716f6401a66961
This commit is contained in:
Mel Gorman
2022-04-28 10:22:03 -07:00
committed by Minchan Kim
parent e70a2e110b
commit a248d08a94
2 changed files with 21 additions and 15 deletions
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18
include/linux/mm_types.h
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@@ -83,12 +83,18 @@ struct page {
*/
union {
struct { /* Page cache and anonymous pages */
/**
* @lru: Pageout list, eg. active_list protected by
* pgdat->lru_lock. Sometimes used as a generic list
* by the page owner.
*/
struct list_head lru;
union {
/**
* @lru: Pageout list, eg. active_list protected by
* pgdat->lru_lock. Sometimes used as a generic list
* by the page owner.
*/
struct list_head lru;
/* Or, free page */
struct list_head buddy_list;
struct list_head pcp_list;
};
/* See page-flags.h for PAGE_MAPPING_FLAGS */
struct address_space *mapping;
pgoff_t index; /* Our offset within mapping. */