[PATCH] shrink struct page (349aef0b) · Commits · 戴 / test

include/linux/mm.h

+22 −19

Original line number	Diff line number	Diff line
		@@ -223,17 +223,15 @@ struct page {
		* & limit reverse map searches.
		*/
		union {
		struct {
		unsigned long private; /* Mapping-private opaque data:
		* usually used for buffer_heads
		* if PagePrivate set; used for
		* swp_entry_t if PageSwapCache
		* When page is free, this indicates
		* order in the buddy system.
		* swp_entry_t if PageSwapCache.
		* When page is free, this
		* indicates order in the buddy
		* system.
		*/
		#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
		spinlock_t ptl;
		#endif
		} u;
		struct address_space mapping; / If low bit clear, points to
		* inode address_space, or NULL.
		* If page mapped as anonymous
		@@ -241,6 +239,11 @@ struct page {
		* it points to anon_vma object:
		* see PAGE_MAPPING_ANON below.
		*/
		};
		#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
		spinlock_t ptl;
		#endif
		};
		pgoff_t index; /* Our offset within mapping. */
		struct list_head lru; /* Pageout list, eg. active_list
		* protected by zone->lru_lock !
		@@ -261,8 +264,8 @@ struct page {
		#endif /* WANT_PAGE_VIRTUAL */
		};

		#define page_private(page) ((page)->u.private)
		#define set_page_private(page, v) ((page)->u.private = (v))
		#define page_private(page) ((page)->private)
		#define set_page_private(page, v) ((page)->private = (v))

		/*
		* FIXME: take this include out, include page-flags.h in
		@@ -815,7 +818,7 @@ static inline pmd_t pmd_alloc(struct mm_struct mm, pud_t *pud, unsigned long a
		* overflow into the next struct page (as it might with DEBUG_SPINLOCK).
		* When freeing, reset page->mapping so free_pages_check won't complain.
		*/
		#define __pte_lockptr(page) &((page)->u.ptl)
		#define __pte_lockptr(page) &((page)->ptl)
		#define pte_lock_init(_page) do { \
		spin_lock_init(__pte_lockptr(_page)); \
		} while (0)

Admin message