Commit 310183de authored by Kiryl Shutsemau's avatar Kiryl Shutsemau Committed by Andrew Morton
Browse files

mm: introduce PageUnaccepted() page type 

The new page type allows physical memory scanners to detect unaccepted
memory and handle it accordingly.

The page type is serialized with zone lock.

Link: https://lkml.kernel.org/r/20240809114854.3745464-5-kirill.shutemov@linux.intel.com


Signed-off-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: default avatarDavid Hildenbrand <david@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 4be9064b

include/linux/page-flags.h

+8 −0
Original line number Diff line number Diff line
@@ -939,6 +939,7 @@ enum pagetype { 
	PG_hugetlb	= 0x04000000,

	PG_slab		= 0x02000000,

	PG_zsmalloc	= 0x01000000,

	PG_unaccepted	= 0x00800000,



	PAGE_TYPE_BASE	= 0x80000000,
@@ -1072,6 +1073,13 @@ FOLIO_TEST_FLAG_FALSE(hugetlb) 


PAGE_TYPE_OPS(Zsmalloc, zsmalloc, zsmalloc)



/*

 * Mark pages that has to be accepted before touched for the first time.

 *

 * Serialized with zone lock.

 */

PAGE_TYPE_OPS(Unaccepted, unaccepted, unaccepted)



/**

 * PageHuge - Determine if the page belongs to hugetlbfs

 * @page: The page to test.

mm/page_alloc.c

+2 −0
Original line number Diff line number Diff line
@@ -6963,6 +6963,7 @@ static bool try_to_accept_memory_one(struct zone *zone) 


	account_freepages(zone, -MAX_ORDER_NR_PAGES, MIGRATE_MOVABLE);

	__mod_zone_page_state(zone, NR_UNACCEPTED, -MAX_ORDER_NR_PAGES);

	__ClearPageUnaccepted(page);

	spin_unlock_irqrestore(&zone->lock, flags);



	accept_page(page, MAX_PAGE_ORDER);
@@ -7021,6 +7022,7 @@ static bool __free_unaccepted(struct page *page) 
	list_add_tail(&page->lru, &zone->unaccepted_pages);

	account_freepages(zone, MAX_ORDER_NR_PAGES, MIGRATE_MOVABLE);

	__mod_zone_page_state(zone, NR_UNACCEPTED, MAX_ORDER_NR_PAGES);

	__SetPageUnaccepted(page);

	spin_unlock_irqrestore(&zone->lock, flags);



	if (first)