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[PATCH] Move page migration related functions near do_migrate_pages()
Group page migration functions in mempolicy.c Add a forward declaration for migrate_page_add (like gather_stats()) and use our new found mobility to group all page migration related function around do_migrate_pages(). Signed-off-by: Christoph Lameter <clameter@sgi.com> Cc: Andi Kleen <ak@muc.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Christoph Lameter
Linus Torvalds
parent
48fce3429d
commit
6ce3c4c0ff
270
mm/mempolicy.c
270
mm/mempolicy.c
@ -183,55 +183,9 @@ static struct mempolicy *mpol_new(int mode, nodemask_t *nodes)
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return policy;
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}
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/* Check if we are the only process mapping the page in question */
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static inline int single_mm_mapping(struct mm_struct *mm,
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struct address_space *mapping)
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{
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struct vm_area_struct *vma;
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struct prio_tree_iter iter;
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int rc = 1;
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spin_lock(&mapping->i_mmap_lock);
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vma_prio_tree_foreach(vma, &iter, &mapping->i_mmap, 0, ULONG_MAX)
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if (mm != vma->vm_mm) {
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rc = 0;
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goto out;
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}
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list_for_each_entry(vma, &mapping->i_mmap_nonlinear, shared.vm_set.list)
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if (mm != vma->vm_mm) {
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rc = 0;
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goto out;
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}
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out:
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spin_unlock(&mapping->i_mmap_lock);
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return rc;
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}
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/*
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* Add a page to be migrated to the pagelist
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*/
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static void migrate_page_add(struct vm_area_struct *vma,
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struct page *page, struct list_head *pagelist, unsigned long flags)
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{
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/*
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* Avoid migrating a page that is shared by others and not writable.
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*/
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if ((flags & MPOL_MF_MOVE_ALL) || !page->mapping || PageAnon(page) ||
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mapping_writably_mapped(page->mapping) ||
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single_mm_mapping(vma->vm_mm, page->mapping)) {
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int rc = isolate_lru_page(page);
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if (rc == 1)
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list_add(&page->lru, pagelist);
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/*
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* If the isolate attempt was not successful then we just
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* encountered an unswappable page. Something must be wrong.
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*/
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WARN_ON(rc == 0);
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}
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}
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static void gather_stats(struct page *, void *);
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static void migrate_page_add(struct vm_area_struct *vma,
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struct page *page, struct list_head *pagelist, unsigned long flags);
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/* Scan through pages checking if pages follow certain conditions. */
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static int check_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
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@ -440,90 +394,6 @@ static int contextualize_policy(int mode, nodemask_t *nodes)
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return mpol_check_policy(mode, nodes);
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}
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static int swap_pages(struct list_head *pagelist)
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{
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LIST_HEAD(moved);
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LIST_HEAD(failed);
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int n;
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n = migrate_pages(pagelist, NULL, &moved, &failed);
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putback_lru_pages(&failed);
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putback_lru_pages(&moved);
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return n;
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}
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long do_mbind(unsigned long start, unsigned long len,
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unsigned long mode, nodemask_t *nmask, unsigned long flags)
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{
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struct vm_area_struct *vma;
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struct mm_struct *mm = current->mm;
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struct mempolicy *new;
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unsigned long end;
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int err;
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LIST_HEAD(pagelist);
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if ((flags & ~(unsigned long)(MPOL_MF_STRICT |
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MPOL_MF_MOVE | MPOL_MF_MOVE_ALL))
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|| mode > MPOL_MAX)
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return -EINVAL;
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if ((flags & MPOL_MF_MOVE_ALL) && !capable(CAP_SYS_RESOURCE))
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return -EPERM;
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if (start & ~PAGE_MASK)
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return -EINVAL;
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if (mode == MPOL_DEFAULT)
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flags &= ~MPOL_MF_STRICT;
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len = (len + PAGE_SIZE - 1) & PAGE_MASK;
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end = start + len;
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if (end < start)
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return -EINVAL;
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if (end == start)
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return 0;
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if (mpol_check_policy(mode, nmask))
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return -EINVAL;
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new = mpol_new(mode, nmask);
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if (IS_ERR(new))
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return PTR_ERR(new);
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/*
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* If we are using the default policy then operation
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* on discontinuous address spaces is okay after all
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*/
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if (!new)
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flags |= MPOL_MF_DISCONTIG_OK;
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PDprintk("mbind %lx-%lx mode:%ld nodes:%lx\n",start,start+len,
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mode,nodes_addr(nodes)[0]);
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down_write(&mm->mmap_sem);
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vma = check_range(mm, start, end, nmask,
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flags | MPOL_MF_INVERT, &pagelist);
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err = PTR_ERR(vma);
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if (!IS_ERR(vma)) {
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int nr_failed = 0;
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err = mbind_range(vma, start, end, new);
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if (!list_empty(&pagelist))
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nr_failed = swap_pages(&pagelist);
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if (!err && nr_failed && (flags & MPOL_MF_STRICT))
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err = -EIO;
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}
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if (!list_empty(&pagelist))
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putback_lru_pages(&pagelist);
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up_write(&mm->mmap_sem);
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mpol_free(new);
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return err;
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}
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/* Set the process memory policy */
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long do_set_mempolicy(int mode, nodemask_t *nodes)
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{
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@ -643,6 +513,71 @@ long do_get_mempolicy(int *policy, nodemask_t *nmask,
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return err;
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}
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/*
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* page migration
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*/
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/* Check if we are the only process mapping the page in question */
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static inline int single_mm_mapping(struct mm_struct *mm,
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struct address_space *mapping)
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{
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struct vm_area_struct *vma;
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struct prio_tree_iter iter;
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int rc = 1;
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spin_lock(&mapping->i_mmap_lock);
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vma_prio_tree_foreach(vma, &iter, &mapping->i_mmap, 0, ULONG_MAX)
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if (mm != vma->vm_mm) {
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rc = 0;
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goto out;
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}
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list_for_each_entry(vma, &mapping->i_mmap_nonlinear, shared.vm_set.list)
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if (mm != vma->vm_mm) {
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rc = 0;
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goto out;
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}
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out:
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spin_unlock(&mapping->i_mmap_lock);
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return rc;
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}
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/*
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* Add a page to be migrated to the pagelist
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*/
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static void migrate_page_add(struct vm_area_struct *vma,
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struct page *page, struct list_head *pagelist, unsigned long flags)
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{
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/*
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* Avoid migrating a page that is shared by others and not writable.
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*/
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if ((flags & MPOL_MF_MOVE_ALL) || !page->mapping || PageAnon(page) ||
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mapping_writably_mapped(page->mapping) ||
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single_mm_mapping(vma->vm_mm, page->mapping)) {
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int rc = isolate_lru_page(page);
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if (rc == 1)
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list_add(&page->lru, pagelist);
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/*
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* If the isolate attempt was not successful then we just
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* encountered an unswappable page. Something must be wrong.
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*/
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WARN_ON(rc == 0);
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}
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}
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static int swap_pages(struct list_head *pagelist)
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{
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LIST_HEAD(moved);
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LIST_HEAD(failed);
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int n;
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n = migrate_pages(pagelist, NULL, &moved, &failed);
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putback_lru_pages(&failed);
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putback_lru_pages(&moved);
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return n;
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}
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/*
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* For now migrate_pages simply swaps out the pages from nodes that are in
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* the source set but not in the target set. In the future, we would
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@ -673,6 +608,77 @@ int do_migrate_pages(struct mm_struct *mm,
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return count;
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}
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long do_mbind(unsigned long start, unsigned long len,
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unsigned long mode, nodemask_t *nmask, unsigned long flags)
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{
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struct vm_area_struct *vma;
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struct mm_struct *mm = current->mm;
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struct mempolicy *new;
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unsigned long end;
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int err;
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LIST_HEAD(pagelist);
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if ((flags & ~(unsigned long)(MPOL_MF_STRICT |
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MPOL_MF_MOVE | MPOL_MF_MOVE_ALL))
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|| mode > MPOL_MAX)
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return -EINVAL;
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if ((flags & MPOL_MF_MOVE_ALL) && !capable(CAP_SYS_RESOURCE))
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return -EPERM;
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if (start & ~PAGE_MASK)
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return -EINVAL;
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if (mode == MPOL_DEFAULT)
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flags &= ~MPOL_MF_STRICT;
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len = (len + PAGE_SIZE - 1) & PAGE_MASK;
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end = start + len;
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if (end < start)
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return -EINVAL;
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if (end == start)
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return 0;
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if (mpol_check_policy(mode, nmask))
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return -EINVAL;
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new = mpol_new(mode, nmask);
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if (IS_ERR(new))
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return PTR_ERR(new);
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/*
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* If we are using the default policy then operation
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* on discontinuous address spaces is okay after all
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*/
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if (!new)
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flags |= MPOL_MF_DISCONTIG_OK;
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PDprintk("mbind %lx-%lx mode:%ld nodes:%lx\n",start,start+len,
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mode,nodes_addr(nodes)[0]);
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down_write(&mm->mmap_sem);
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vma = check_range(mm, start, end, nmask,
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flags | MPOL_MF_INVERT, &pagelist);
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err = PTR_ERR(vma);
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if (!IS_ERR(vma)) {
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int nr_failed = 0;
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err = mbind_range(vma, start, end, new);
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if (!list_empty(&pagelist))
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nr_failed = swap_pages(&pagelist);
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if (!err && nr_failed && (flags & MPOL_MF_STRICT))
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err = -EIO;
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}
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if (!list_empty(&pagelist))
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putback_lru_pages(&pagelist);
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up_write(&mm->mmap_sem);
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mpol_free(new);
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return err;
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}
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/*
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* User space interface with variable sized bitmaps for nodelists.
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*/
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