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mm: remove page->order

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We already use page->private for storing the order of a page while it's in
the buddy allocator system; extend that to also storing the order while
it's in the pcp_llist.

Link: https://lkml.kernel.org/r/20250910142923.2465470-4-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle)
2025-09-10 15:29:19 +01:00
committed by Andrew Morton
parent 6fd893a40e
commit 9d003dec97
2 changed files with 5 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/linux/mm_types.h
+3 -5
View File
@@ -97,10 +97,7 @@ struct page {
/* Or, free page */
struct list_head buddy_list;
struct list_head pcp_list;
struct {
struct llist_node pcp_llist;
unsigned int order;
};
struct llist_node pcp_llist;
};
struct address_space *mapping;
union {
@@ -111,7 +108,8 @@ struct page {
* @private: Mapping-private opaque data.
* Usually used for buffer_heads if PagePrivate.
* Used for swp_entry_t if swapcache flag set.
* Indicates order in the buddy system if PageBuddy.
* Indicates order in the buddy system if PageBuddy
* or on pcp_llist.
*/
unsigned long private;
};
mm/page_alloc.c
+2 -2
View File
@@ -1520,7 +1520,7 @@ static void add_page_to_zone_llist(struct zone *zone, struct page *page,
unsigned int order)
{
/* Remember the order */
page->order = order;
page->private = order;
/* Add the page to the free list */
llist_add(&page->pcp_llist, &zone->trylock_free_pages);
}
@@ -1549,7 +1549,7 @@ static void free_one_page(struct zone *zone, struct page *page,
llnode = llist_del_all(llhead);
llist_for_each_entry_safe(p, tmp, llnode, pcp_llist) {
unsigned int p_order = p->order;
unsigned int p_order = p->private;
split_large_buddy(zone, p, page_to_pfn(p), p_order, fpi_flags);
__count_vm_events(PGFREE, 1 << p_order);