[PATCH] own header file for struct page (5b99cd0e) · Commits · 戴 / test

include/linux/mm.h

+1 −61

Original line number	Diff line number	Diff line
		@@ -16,6 +16,7 @@
		#include <linux/mutex.h>
		#include <linux/debug_locks.h>
		#include <linux/backing-dev.h>
		#include <linux/mm_types.h>

		struct mempolicy;
		struct anon_vma;
		@@ -215,62 +216,6 @@ struct vm_operations_struct {
		struct mmu_gather;
		struct inode;

		/*
		* Each physical page in the system has a struct page associated with
		* it to keep track of whatever it is we are using the page for at the
		* moment. Note that we have no way to track which tasks are using
		* a page, though if it is a pagecache page, rmap structures can tell us
		* who is mapping it.
		*/
		struct page {
		unsigned long flags; /* Atomic flags, some possibly
		* updated asynchronously */
		atomic_t _count; /* Usage count, see below. */
		atomic_t _mapcount; /* Count of ptes mapped in mms,
		* to show when page is mapped
		* & 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;
		* indicates order in the buddy
		* system if PG_buddy is set.
		*/
		struct address_space mapping; / If low bit clear, points to
		* inode address_space, or NULL.
		* If page mapped as anonymous
		* memory, low bit is set, and
		* 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 !
		*/
		/*
		* On machines where all RAM is mapped into kernel address space,
		* we can simply calculate the virtual address. On machines with
		* highmem some memory is mapped into kernel virtual memory
		* dynamically, so we need a place to store that address.
		* Note that this field could be 16 bits on x86 ... ;)
		*
		* Architectures with slow multiplication can define
		* WANT_PAGE_VIRTUAL in asm/page.h
		*/
		#if defined(WANT_PAGE_VIRTUAL)
		void virtual; / Kernel virtual address (NULL if
		not kmapped, ie. highmem) */
		#endif /* WANT_PAGE_VIRTUAL */
		};

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

		@@ -546,11 +491,6 @@ static inline void set_page_links(struct page *page, enum zone_type zone,
		*/
		#include <linux/vmstat.h>

		#ifndef CONFIG_DISCONTIGMEM
		/* The array of struct pages - for discontigmem use pgdat->lmem_map */
		extern struct page *mem_map;
		#endif

		static __always_inline void lowmem_page_address(struct page page)
		{
		return __va(page_to_pfn(page) << PAGE_SHIFT);

include/linux/mm_types.h

0 → 100644

+67 −0

Original line number	Diff line number	Diff line
		#ifndef _LINUX_MM_TYPES_H
		#define _LINUX_MM_TYPES_H

		#include <linux/types.h>
		#include <linux/threads.h>
		#include <linux/list.h>
		#include <linux/spinlock.h>

		struct address_space;

		/*
		* Each physical page in the system has a struct page associated with
		* it to keep track of whatever it is we are using the page for at the
		* moment. Note that we have no way to track which tasks are using
		* a page, though if it is a pagecache page, rmap structures can tell us
		* who is mapping it.
		*/
		struct page {
		unsigned long flags; /* Atomic flags, some possibly
		* updated asynchronously */
		atomic_t _count; /* Usage count, see below. */
		atomic_t _mapcount; /* Count of ptes mapped in mms,
		* to show when page is mapped
		* & 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;
		* indicates order in the buddy
		* system if PG_buddy is set.
		*/
		struct address_space mapping; / If low bit clear, points to
		* inode address_space, or NULL.
		* If page mapped as anonymous
		* memory, low bit is set, and
		* 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 !
		*/
		/*
		* On machines where all RAM is mapped into kernel address space,
		* we can simply calculate the virtual address. On machines with
		* highmem some memory is mapped into kernel virtual memory
		* dynamically, so we need a place to store that address.
		* Note that this field could be 16 bits on x86 ... ;)
		*
		* Architectures with slow multiplication can define
		* WANT_PAGE_VIRTUAL in asm/page.h
		*/
		#if defined(WANT_PAGE_VIRTUAL)
		void virtual; / Kernel virtual address (NULL if
		not kmapped, ie. highmem) */
		#endif /* WANT_PAGE_VIRTUAL */
		};

		#endif /* _LINUX_MM_TYPES_H */

include/linux/mmzone.h

+5 −0

Original line number	Diff line number	Diff line
		@@ -314,6 +314,11 @@ struct node_active_region {
		};
		#endif /* CONFIG_ARCH_POPULATES_NODE_MAP */

		#ifndef CONFIG_DISCONTIGMEM
		/* The array of struct pages - for discontigmem use pgdat->lmem_map */
		extern struct page *mem_map;
		#endif

		/*
		* The pg_data_t structure is used in machines with CONFIG_DISCONTIGMEM
		* (mostly NUMA machines?) to denote a higher-level memory zone than the

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