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