mirror of https://gitee.com/openkylin/linux.git
mempolicy: apply page table walker on queue_pages_range()
queue_pages_range() does page table walking in its own way now, but there is some code duplicate. This patch applies page table walker to reduce lines of code. queue_pages_range() has to do some precheck to determine whether we really walk over the vma or just skip it. Now we have test_walk() callback in mm_walk for this purpose, so we can do this replacement cleanly. queue_pages_test_walk() depends on not only the current vma but also the previous one, so queue_pages->prev is introduced to remember it. Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Cyrill Gorcunov <gorcunov@openvz.org> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Pavel Emelyanov <xemul@parallels.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Naoya Horiguchi
Linus Torvalds
parent
1757bbd9c5
commit
6f4576e368
224
mm/mempolicy.c
224
mm/mempolicy.c
|
|
@ -471,24 +471,34 @@ static const struct mempolicy_operations mpol_ops[MPOL_MAX] = {
|
|||
static void migrate_page_add(struct page *page, struct list_head *pagelist,
|
||||
unsigned long flags);
|
||||
|
||||
struct queue_pages {
|
||||
struct list_head *pagelist;
|
||||
unsigned long flags;
|
||||
nodemask_t *nmask;
|
||||
struct vm_area_struct *prev;
|
||||
};
|
||||
|
||||
/*
|
||||
* Scan through pages checking if pages follow certain conditions,
|
||||
* and move them to the pagelist if they do.
|
||||
*/
|
||||
static int queue_pages_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
|
||||
unsigned long addr, unsigned long end,
|
||||
const nodemask_t *nodes, unsigned long flags,
|
||||
void *private)
|
||||
static int queue_pages_pte_range(pmd_t *pmd, unsigned long addr,
|
||||
unsigned long end, struct mm_walk *walk)
|
||||
{
|
||||
pte_t *orig_pte;
|
||||
struct vm_area_struct *vma = walk->vma;
|
||||
struct page *page;
|
||||
struct queue_pages *qp = walk->private;
|
||||
unsigned long flags = qp->flags;
|
||||
int nid;
|
||||
pte_t *pte;
|
||||
spinlock_t *ptl;
|
||||
|
||||
orig_pte = pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
|
||||
do {
|
||||
struct page *page;
|
||||
int nid;
|
||||
split_huge_page_pmd(vma, addr, pmd);
|
||||
if (pmd_trans_unstable(pmd))
|
||||
return 0;
|
||||
|
||||
pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
|
||||
for (; addr != end; pte++, addr += PAGE_SIZE) {
|
||||
if (!pte_present(*pte))
|
||||
continue;
|
||||
page = vm_normal_page(vma, addr, *pte);
|
||||
|
|
@ -501,114 +511,46 @@ static int queue_pages_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
|
|||
if (PageReserved(page))
|
||||
continue;
|
||||
nid = page_to_nid(page);
|
||||
if (node_isset(nid, *nodes) == !!(flags & MPOL_MF_INVERT))
|
||||
if (node_isset(nid, *qp->nmask) == !!(flags & MPOL_MF_INVERT))
|
||||
continue;
|
||||
|
||||
if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL))
|
||||
migrate_page_add(page, private, flags);
|
||||
else
|
||||
break;
|
||||
} while (pte++, addr += PAGE_SIZE, addr != end);
|
||||
pte_unmap_unlock(orig_pte, ptl);
|
||||
return addr != end;
|
||||
migrate_page_add(page, qp->pagelist, flags);
|
||||
}
|
||||
pte_unmap_unlock(pte - 1, ptl);
|
||||
cond_resched();
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void queue_pages_hugetlb_pmd_range(struct vm_area_struct *vma,
|
||||
pmd_t *pmd, const nodemask_t *nodes, unsigned long flags,
|
||||
void *private)
|
||||
static int queue_pages_hugetlb(pte_t *pte, unsigned long hmask,
|
||||
unsigned long addr, unsigned long end,
|
||||
struct mm_walk *walk)
|
||||
{
|
||||
#ifdef CONFIG_HUGETLB_PAGE
|
||||
struct queue_pages *qp = walk->private;
|
||||
unsigned long flags = qp->flags;
|
||||
int nid;
|
||||
struct page *page;
|
||||
spinlock_t *ptl;
|
||||
pte_t entry;
|
||||
|
||||
ptl = huge_pte_lock(hstate_vma(vma), vma->vm_mm, (pte_t *)pmd);
|
||||
entry = huge_ptep_get((pte_t *)pmd);
|
||||
ptl = huge_pte_lock(hstate_vma(walk->vma), walk->mm, pte);
|
||||
entry = huge_ptep_get(pte);
|
||||
if (!pte_present(entry))
|
||||
goto unlock;
|
||||
page = pte_page(entry);
|
||||
nid = page_to_nid(page);
|
||||
if (node_isset(nid, *nodes) == !!(flags & MPOL_MF_INVERT))
|
||||
if (node_isset(nid, *qp->nmask) == !!(flags & MPOL_MF_INVERT))
|
||||
goto unlock;
|
||||
/* With MPOL_MF_MOVE, we migrate only unshared hugepage. */
|
||||
if (flags & (MPOL_MF_MOVE_ALL) ||
|
||||
(flags & MPOL_MF_MOVE && page_mapcount(page) == 1))
|
||||
isolate_huge_page(page, private);
|
||||
isolate_huge_page(page, qp->pagelist);
|
||||
unlock:
|
||||
spin_unlock(ptl);
|
||||
#else
|
||||
BUG();
|
||||
#endif
|
||||
}
|
||||
|
||||
static inline int queue_pages_pmd_range(struct vm_area_struct *vma, pud_t *pud,
|
||||
unsigned long addr, unsigned long end,
|
||||
const nodemask_t *nodes, unsigned long flags,
|
||||
void *private)
|
||||
{
|
||||
pmd_t *pmd;
|
||||
unsigned long next;
|
||||
|
||||
pmd = pmd_offset(pud, addr);
|
||||
do {
|
||||
next = pmd_addr_end(addr, end);
|
||||
if (!pmd_present(*pmd))
|
||||
continue;
|
||||
if (pmd_huge(*pmd) && is_vm_hugetlb_page(vma)) {
|
||||
queue_pages_hugetlb_pmd_range(vma, pmd, nodes,
|
||||
flags, private);
|
||||
continue;
|
||||
}
|
||||
split_huge_page_pmd(vma, addr, pmd);
|
||||
if (pmd_none_or_trans_huge_or_clear_bad(pmd))
|
||||
continue;
|
||||
if (queue_pages_pte_range(vma, pmd, addr, next, nodes,
|
||||
flags, private))
|
||||
return -EIO;
|
||||
} while (pmd++, addr = next, addr != end);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline int queue_pages_pud_range(struct vm_area_struct *vma, pgd_t *pgd,
|
||||
unsigned long addr, unsigned long end,
|
||||
const nodemask_t *nodes, unsigned long flags,
|
||||
void *private)
|
||||
{
|
||||
pud_t *pud;
|
||||
unsigned long next;
|
||||
|
||||
pud = pud_offset(pgd, addr);
|
||||
do {
|
||||
next = pud_addr_end(addr, end);
|
||||
if (pud_huge(*pud) && is_vm_hugetlb_page(vma))
|
||||
continue;
|
||||
if (pud_none_or_clear_bad(pud))
|
||||
continue;
|
||||
if (queue_pages_pmd_range(vma, pud, addr, next, nodes,
|
||||
flags, private))
|
||||
return -EIO;
|
||||
} while (pud++, addr = next, addr != end);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline int queue_pages_pgd_range(struct vm_area_struct *vma,
|
||||
unsigned long addr, unsigned long end,
|
||||
const nodemask_t *nodes, unsigned long flags,
|
||||
void *private)
|
||||
{
|
||||
pgd_t *pgd;
|
||||
unsigned long next;
|
||||
|
||||
pgd = pgd_offset(vma->vm_mm, addr);
|
||||
do {
|
||||
next = pgd_addr_end(addr, end);
|
||||
if (pgd_none_or_clear_bad(pgd))
|
||||
continue;
|
||||
if (queue_pages_pud_range(vma, pgd, addr, next, nodes,
|
||||
flags, private))
|
||||
return -EIO;
|
||||
} while (pgd++, addr = next, addr != end);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -641,6 +583,46 @@ static unsigned long change_prot_numa(struct vm_area_struct *vma,
|
|||
}
|
||||
#endif /* CONFIG_NUMA_BALANCING */
|
||||
|
||||
static int queue_pages_test_walk(unsigned long start, unsigned long end,
|
||||
struct mm_walk *walk)
|
||||
{
|
||||
struct vm_area_struct *vma = walk->vma;
|
||||
struct queue_pages *qp = walk->private;
|
||||
unsigned long endvma = vma->vm_end;
|
||||
unsigned long flags = qp->flags;
|
||||
|
||||
if (endvma > end)
|
||||
endvma = end;
|
||||
if (vma->vm_start > start)
|
||||
start = vma->vm_start;
|
||||
|
||||
if (!(flags & MPOL_MF_DISCONTIG_OK)) {
|
||||
if (!vma->vm_next && vma->vm_end < end)
|
||||
return -EFAULT;
|
||||
if (qp->prev && qp->prev->vm_end < vma->vm_start)
|
||||
return -EFAULT;
|
||||
}
|
||||
|
||||
qp->prev = vma;
|
||||
|
||||
if (vma->vm_flags & VM_PFNMAP)
|
||||
return 1;
|
||||
|
||||
if (flags & MPOL_MF_LAZY) {
|
||||
/* Similar to task_numa_work, skip inaccessible VMAs */
|
||||
if (vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE))
|
||||
change_prot_numa(vma, start, endvma);
|
||||
return 1;
|
||||
}
|
||||
|
||||
if ((flags & MPOL_MF_STRICT) ||
|
||||
((flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) &&
|
||||
vma_migratable(vma)))
|
||||
/* queue pages from current vma */
|
||||
return 0;
|
||||
return 1;
|
||||
}
|
||||
|
||||
/*
|
||||
* Walk through page tables and collect pages to be migrated.
|
||||
*
|
||||
|
|
@ -650,50 +632,24 @@ static unsigned long change_prot_numa(struct vm_area_struct *vma,
|
|||
*/
|
||||
static int
|
||||
queue_pages_range(struct mm_struct *mm, unsigned long start, unsigned long end,
|
||||
const nodemask_t *nodes, unsigned long flags, void *private)
|
||||
nodemask_t *nodes, unsigned long flags,
|
||||
struct list_head *pagelist)
|
||||
{
|
||||
int err = 0;
|
||||
struct vm_area_struct *vma, *prev;
|
||||
struct queue_pages qp = {
|
||||
.pagelist = pagelist,
|
||||
.flags = flags,
|
||||
.nmask = nodes,
|
||||
.prev = NULL,
|
||||
};
|
||||
struct mm_walk queue_pages_walk = {
|
||||
.hugetlb_entry = queue_pages_hugetlb,
|
||||
.pmd_entry = queue_pages_pte_range,
|
||||
.test_walk = queue_pages_test_walk,
|
||||
.mm = mm,
|
||||
.private = &qp,
|
||||
};
|
||||
|
||||
vma = find_vma(mm, start);
|
||||
if (!vma)
|
||||
return -EFAULT;
|
||||
prev = NULL;
|
||||
for (; vma && vma->vm_start < end; vma = vma->vm_next) {
|
||||
unsigned long endvma = vma->vm_end;
|
||||
|
||||
if (endvma > end)
|
||||
endvma = end;
|
||||
if (vma->vm_start > start)
|
||||
start = vma->vm_start;
|
||||
|
||||
if (!(flags & MPOL_MF_DISCONTIG_OK)) {
|
||||
if (!vma->vm_next && vma->vm_end < end)
|
||||
return -EFAULT;
|
||||
if (prev && prev->vm_end < vma->vm_start)
|
||||
return -EFAULT;
|
||||
}
|
||||
|
||||
if (flags & MPOL_MF_LAZY) {
|
||||
/* Similar to task_numa_work, skip inaccessible VMAs */
|
||||
if (vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE))
|
||||
change_prot_numa(vma, start, endvma);
|
||||
goto next;
|
||||
}
|
||||
|
||||
if ((flags & MPOL_MF_STRICT) ||
|
||||
((flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) &&
|
||||
vma_migratable(vma))) {
|
||||
|
||||
err = queue_pages_pgd_range(vma, start, endvma, nodes,
|
||||
flags, private);
|
||||
if (err)
|
||||
break;
|
||||
}
|
||||
next:
|
||||
prev = vma;
|
||||
}
|
||||
return err;
|
||||
return walk_page_range(start, end, &queue_pages_walk);
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
|
|||
Loading…
Reference in New Issue