mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 08:26:49 +07:00
ca641514f4
Currently we don't clobber page_tail->first_page during split_huge_page, so compound_trans_head can be set to compound_head without adverse effects, and this mostly optimizes away a smp_rmb. It looks worthwhile to keep around the implementation that doesn't relay on page_tail->first_page not to be clobbered, because it would be necessary if we'll decide to enforce page->private to zero at all times whenever PG_private is not set, also for anonymous pages. For anonymous pages enforcing such an invariant doesn't matter as anonymous pages don't use page->private so we can get away with this microoptimization. Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Cc: Khalid Aziz <khalid.aziz@oracle.com> Cc: Pravin Shelar <pshelar@nicira.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Ben Hutchings <bhutchings@solarflare.com> Cc: Christoph Lameter <cl@linux.com> Cc: Johannes Weiner <jweiner@redhat.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Rik van Riel <riel@redhat.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Minchan Kim <minchan@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
257 lines
8.5 KiB
C
257 lines
8.5 KiB
C
#ifndef _LINUX_HUGE_MM_H
|
|
#define _LINUX_HUGE_MM_H
|
|
|
|
extern int do_huge_pmd_anonymous_page(struct mm_struct *mm,
|
|
struct vm_area_struct *vma,
|
|
unsigned long address, pmd_t *pmd,
|
|
unsigned int flags);
|
|
extern int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
|
|
pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
|
|
struct vm_area_struct *vma);
|
|
extern void huge_pmd_set_accessed(struct mm_struct *mm,
|
|
struct vm_area_struct *vma,
|
|
unsigned long address, pmd_t *pmd,
|
|
pmd_t orig_pmd, int dirty);
|
|
extern int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
|
|
unsigned long address, pmd_t *pmd,
|
|
pmd_t orig_pmd);
|
|
extern struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
|
|
unsigned long addr,
|
|
pmd_t *pmd,
|
|
unsigned int flags);
|
|
extern int zap_huge_pmd(struct mmu_gather *tlb,
|
|
struct vm_area_struct *vma,
|
|
pmd_t *pmd, unsigned long addr);
|
|
extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
|
|
unsigned long addr, unsigned long end,
|
|
unsigned char *vec);
|
|
extern int move_huge_pmd(struct vm_area_struct *vma,
|
|
struct vm_area_struct *new_vma,
|
|
unsigned long old_addr,
|
|
unsigned long new_addr, unsigned long old_end,
|
|
pmd_t *old_pmd, pmd_t *new_pmd);
|
|
extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
|
|
unsigned long addr, pgprot_t newprot,
|
|
int prot_numa);
|
|
|
|
enum transparent_hugepage_flag {
|
|
TRANSPARENT_HUGEPAGE_FLAG,
|
|
TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
|
|
TRANSPARENT_HUGEPAGE_DEFRAG_FLAG,
|
|
TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
|
|
TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
|
|
TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
|
|
#ifdef CONFIG_DEBUG_VM
|
|
TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
|
|
#endif
|
|
};
|
|
|
|
enum page_check_address_pmd_flag {
|
|
PAGE_CHECK_ADDRESS_PMD_FLAG,
|
|
PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG,
|
|
PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG,
|
|
};
|
|
extern pmd_t *page_check_address_pmd(struct page *page,
|
|
struct mm_struct *mm,
|
|
unsigned long address,
|
|
enum page_check_address_pmd_flag flag,
|
|
spinlock_t **ptl);
|
|
|
|
#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
|
|
#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
|
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|
#define HPAGE_PMD_SHIFT PMD_SHIFT
|
|
#define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
|
|
#define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
|
|
|
|
extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
|
|
|
|
#define transparent_hugepage_enabled(__vma) \
|
|
((transparent_hugepage_flags & \
|
|
(1<<TRANSPARENT_HUGEPAGE_FLAG) || \
|
|
(transparent_hugepage_flags & \
|
|
(1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
|
|
((__vma)->vm_flags & VM_HUGEPAGE))) && \
|
|
!((__vma)->vm_flags & VM_NOHUGEPAGE) && \
|
|
!is_vma_temporary_stack(__vma))
|
|
#define transparent_hugepage_defrag(__vma) \
|
|
((transparent_hugepage_flags & \
|
|
(1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \
|
|
(transparent_hugepage_flags & \
|
|
(1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
|
|
(__vma)->vm_flags & VM_HUGEPAGE))
|
|
#define transparent_hugepage_use_zero_page() \
|
|
(transparent_hugepage_flags & \
|
|
(1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
|
|
#ifdef CONFIG_DEBUG_VM
|
|
#define transparent_hugepage_debug_cow() \
|
|
(transparent_hugepage_flags & \
|
|
(1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
|
|
#else /* CONFIG_DEBUG_VM */
|
|
#define transparent_hugepage_debug_cow() 0
|
|
#endif /* CONFIG_DEBUG_VM */
|
|
|
|
extern unsigned long transparent_hugepage_flags;
|
|
extern int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
|
|
pmd_t *dst_pmd, pmd_t *src_pmd,
|
|
struct vm_area_struct *vma,
|
|
unsigned long addr, unsigned long end);
|
|
extern int split_huge_page_to_list(struct page *page, struct list_head *list);
|
|
static inline int split_huge_page(struct page *page)
|
|
{
|
|
return split_huge_page_to_list(page, NULL);
|
|
}
|
|
extern void __split_huge_page_pmd(struct vm_area_struct *vma,
|
|
unsigned long address, pmd_t *pmd);
|
|
#define split_huge_page_pmd(__vma, __address, __pmd) \
|
|
do { \
|
|
pmd_t *____pmd = (__pmd); \
|
|
if (unlikely(pmd_trans_huge(*____pmd))) \
|
|
__split_huge_page_pmd(__vma, __address, \
|
|
____pmd); \
|
|
} while (0)
|
|
#define wait_split_huge_page(__anon_vma, __pmd) \
|
|
do { \
|
|
pmd_t *____pmd = (__pmd); \
|
|
anon_vma_lock_write(__anon_vma); \
|
|
anon_vma_unlock_write(__anon_vma); \
|
|
BUG_ON(pmd_trans_splitting(*____pmd) || \
|
|
pmd_trans_huge(*____pmd)); \
|
|
} while (0)
|
|
extern void split_huge_page_pmd_mm(struct mm_struct *mm, unsigned long address,
|
|
pmd_t *pmd);
|
|
#if HPAGE_PMD_ORDER >= MAX_ORDER
|
|
#error "hugepages can't be allocated by the buddy allocator"
|
|
#endif
|
|
extern int hugepage_madvise(struct vm_area_struct *vma,
|
|
unsigned long *vm_flags, int advice);
|
|
extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
|
|
unsigned long start,
|
|
unsigned long end,
|
|
long adjust_next);
|
|
extern int __pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
|
|
spinlock_t **ptl);
|
|
/* mmap_sem must be held on entry */
|
|
static inline int pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
|
|
spinlock_t **ptl)
|
|
{
|
|
VM_BUG_ON(!rwsem_is_locked(&vma->vm_mm->mmap_sem));
|
|
if (pmd_trans_huge(*pmd))
|
|
return __pmd_trans_huge_lock(pmd, vma, ptl);
|
|
else
|
|
return 0;
|
|
}
|
|
static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
|
|
unsigned long start,
|
|
unsigned long end,
|
|
long adjust_next)
|
|
{
|
|
if (!vma->anon_vma || vma->vm_ops)
|
|
return;
|
|
__vma_adjust_trans_huge(vma, start, end, adjust_next);
|
|
}
|
|
static inline int hpage_nr_pages(struct page *page)
|
|
{
|
|
if (unlikely(PageTransHuge(page)))
|
|
return HPAGE_PMD_NR;
|
|
return 1;
|
|
}
|
|
/*
|
|
* compound_trans_head() should be used instead of compound_head(),
|
|
* whenever the "page" passed as parameter could be the tail of a
|
|
* transparent hugepage that could be undergoing a
|
|
* __split_huge_page_refcount(). The page structure layout often
|
|
* changes across releases and it makes extensive use of unions. So if
|
|
* the page structure layout will change in a way that
|
|
* page->first_page gets clobbered by __split_huge_page_refcount, the
|
|
* implementation making use of smp_rmb() will be required.
|
|
*
|
|
* Currently we define compound_trans_head as compound_head, because
|
|
* page->private is in the same union with page->first_page, and
|
|
* page->private isn't clobbered. However this also means we're
|
|
* currently leaving dirt into the page->private field of anonymous
|
|
* pages resulting from a THP split, instead of setting page->private
|
|
* to zero like for every other page that has PG_private not set. But
|
|
* anonymous pages don't use page->private so this is not a problem.
|
|
*/
|
|
#if 0
|
|
/* This will be needed if page->private will be clobbered in split_huge_page */
|
|
static inline struct page *compound_trans_head(struct page *page)
|
|
{
|
|
if (PageTail(page)) {
|
|
struct page *head;
|
|
head = page->first_page;
|
|
smp_rmb();
|
|
/*
|
|
* head may be a dangling pointer.
|
|
* __split_huge_page_refcount clears PageTail before
|
|
* overwriting first_page, so if PageTail is still
|
|
* there it means the head pointer isn't dangling.
|
|
*/
|
|
if (PageTail(page))
|
|
return head;
|
|
}
|
|
return page;
|
|
}
|
|
#else
|
|
#define compound_trans_head(page) compound_head(page)
|
|
#endif
|
|
|
|
extern int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
|
|
unsigned long addr, pmd_t pmd, pmd_t *pmdp);
|
|
|
|
#else /* CONFIG_TRANSPARENT_HUGEPAGE */
|
|
#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
|
|
#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
|
|
#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
|
|
|
|
#define hpage_nr_pages(x) 1
|
|
|
|
#define transparent_hugepage_enabled(__vma) 0
|
|
|
|
#define transparent_hugepage_flags 0UL
|
|
static inline int
|
|
split_huge_page_to_list(struct page *page, struct list_head *list)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline int split_huge_page(struct page *page)
|
|
{
|
|
return 0;
|
|
}
|
|
#define split_huge_page_pmd(__vma, __address, __pmd) \
|
|
do { } while (0)
|
|
#define wait_split_huge_page(__anon_vma, __pmd) \
|
|
do { } while (0)
|
|
#define split_huge_page_pmd_mm(__mm, __address, __pmd) \
|
|
do { } while (0)
|
|
#define compound_trans_head(page) compound_head(page)
|
|
static inline int hugepage_madvise(struct vm_area_struct *vma,
|
|
unsigned long *vm_flags, int advice)
|
|
{
|
|
BUG();
|
|
return 0;
|
|
}
|
|
static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
|
|
unsigned long start,
|
|
unsigned long end,
|
|
long adjust_next)
|
|
{
|
|
}
|
|
static inline int pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
|
|
spinlock_t **ptl)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
|
|
unsigned long addr, pmd_t pmd, pmd_t *pmdp)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
|
|
|
|
#endif /* _LINUX_HUGE_MM_H */
|