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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2008-02-08 07:22:04 -0500
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-08 12:22:42 -0500
commit2f569afd9ced9ebec9a6eb3dbf6f83429be0a7b4 (patch)
tree23a31763887d9505e62e9d7cc8ec2fa4b86bd380 /include/linux/mm.h
parent13214adf738abc92b0a00c0763fd3be79eebaa7c (diff)
CONFIG_HIGHPTE vs. sub-page page tables.
Background: I've implemented 1K/2K page tables for s390. These sub-page page tables are required to properly support the s390 virtualization instruction with KVM. The SIE instruction requires that the page tables have 256 page table entries (pte) followed by 256 page status table entries (pgste). The pgstes are only required if the process is using the SIE instruction. The pgstes are updated by the hardware and by the hypervisor for a number of reasons, one of them is dirty and reference bit tracking. To avoid wasting memory the standard pte table allocation should return 1K/2K (31/64 bit) and 2K/4K if the process is using SIE. Problem: Page size on s390 is 4K, page table size is 1K or 2K. That means the s390 version for pte_alloc_one cannot return a pointer to a struct page. Trouble is that with the CONFIG_HIGHPTE feature on x86 pte_alloc_one cannot return a pointer to a pte either, since that would require more than 32 bit for the return value of pte_alloc_one (and the pte * would not be accessible since its not kmapped). Solution: The only solution I found to this dilemma is a new typedef: a pgtable_t. For s390 pgtable_t will be a (pte *) - to be introduced with a later patch. For everybody else it will be a (struct page *). The additional problem with the initialization of the ptl lock and the NR_PAGETABLE accounting is solved with a constructor pgtable_page_ctor and a destructor pgtable_page_dtor. The page table allocation and free functions need to call these two whenever a page table page is allocated or freed. pmd_populate will get a pgtable_t instead of a struct page pointer. To get the pgtable_t back from a pmd entry that has been installed with pmd_populate a new function pmd_pgtable is added. It replaces the pmd_page call in free_pte_range and apply_to_pte_range. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/mm.h')
-rw-r--r--include/linux/mm.h14
1 files changed, 13 insertions, 1 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 89d7c691b93a..e8abb3814209 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -894,6 +894,18 @@ static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long a
894#define pte_lockptr(mm, pmd) ({(void)(pmd); &(mm)->page_table_lock;}) 894#define pte_lockptr(mm, pmd) ({(void)(pmd); &(mm)->page_table_lock;})
895#endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ 895#endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
896 896
897static inline void pgtable_page_ctor(struct page *page)
898{
899 pte_lock_init(page);
900 inc_zone_page_state(page, NR_PAGETABLE);
901}
902
903static inline void pgtable_page_dtor(struct page *page)
904{
905 pte_lock_deinit(page);
906 dec_zone_page_state(page, NR_PAGETABLE);
907}
908
897#define pte_offset_map_lock(mm, pmd, address, ptlp) \ 909#define pte_offset_map_lock(mm, pmd, address, ptlp) \
898({ \ 910({ \
899 spinlock_t *__ptl = pte_lockptr(mm, pmd); \ 911 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
@@ -1136,7 +1148,7 @@ struct page *follow_page(struct vm_area_struct *, unsigned long address,
1136#define FOLL_GET 0x04 /* do get_page on page */ 1148#define FOLL_GET 0x04 /* do get_page on page */
1137#define FOLL_ANON 0x08 /* give ZERO_PAGE if no pgtable */ 1149#define FOLL_ANON 0x08 /* give ZERO_PAGE if no pgtable */
1138 1150
1139typedef int (*pte_fn_t)(pte_t *pte, struct page *pmd_page, unsigned long addr, 1151typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
1140 void *data); 1152 void *data);
1141extern int apply_to_page_range(struct mm_struct *mm, unsigned long address, 1153extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,
1142 unsigned long size, pte_fn_t fn, void *data); 1154 unsigned long size, pte_fn_t fn, void *data);