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[PATCH] mempolicies: private pointer in check_range and MPOL_MF_INVERT 

This was was first posted at
http://marc.theaimsgroup.com/?l=linux-mm&m=113149240227584&w=2

(Part of this functionality is also contained in the direct migration
pathset. The functionality here is more generic and independent of that
patchset.)

- Add internal flags MPOL_MF_INVERT to control check_range() behavior.

- Replace the pagelist passed through by check_range by a general
  private pointer that may be used for other purposes.
  (The following patches will use that to merge numa_maps into
  mempolicy.c and to better group the page migration code in
  the policy layer)

- Improve some comments.

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 2006-01-08 01:01:01 -08:00 коммит произвёл Linus Torvalds
Родитель ef2bf0dc86
Коммит 38e35860db
1 изменённых файлов: 24 добавлений и 22 удалений
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46
mm/mempolicy.c
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@ -88,8 +88,9 @@
#include <asm/tlbflush.h>
#include <asm/uaccess.h>
/* Internal MPOL_MF_xxx flags */
/* Internal flags */
#define MPOL_MF_DISCONTIG_OK (MPOL_MF_INTERNAL << 0) /* Skip checks for continuous vmas */
#define MPOL_MF_INVERT (MPOL_MF_INTERNAL << 1) /* Invert check for nodemask */
static kmem_cache_t *policy_cache;
static kmem_cache_t *sn_cache;
@ -227,11 +228,11 @@ static void migrate_page_add(struct vm_area_struct *vma,
}
}
/* Ensure all existing pages follow the policy. */
/* Scan through pages checking if pages follow certain conditions. */
static int check_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
unsigned long addr, unsigned long end,
const nodemask_t *nodes, unsigned long flags,
struct list_head *pagelist)
void *private)
{
pte_t *orig_pte;
pte_t *pte;
@ -248,12 +249,13 @@ static int check_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
if (!page)
continue;
nid = page_to_nid(page);
if (!node_isset(nid, *nodes)) {
if (pagelist)
migrate_page_add(vma, page, pagelist, flags);
else
break;
}
if (node_isset(nid, *nodes) == !!(flags & MPOL_MF_INVERT))
continue;
if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL))
migrate_page_add(vma, page, private, flags);
else
break;
} while (pte++, addr += PAGE_SIZE, addr != end);
pte_unmap_unlock(orig_pte, ptl);
return addr != end;
@ -262,7 +264,7 @@ static int check_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
static inline int check_pmd_range(struct vm_area_struct *vma, pud_t *pud,
unsigned long addr, unsigned long end,
const nodemask_t *nodes, unsigned long flags,
struct list_head *pagelist)
void *private)
{
pmd_t *pmd;
unsigned long next;
@ -273,7 +275,7 @@ static inline int check_pmd_range(struct vm_area_struct *vma, pud_t *pud,
if (pmd_none_or_clear_bad(pmd))
continue;
if (check_pte_range(vma, pmd, addr, next, nodes,
flags, pagelist))
flags, private))
return -EIO;
} while (pmd++, addr = next, addr != end);
return 0;
@ -282,7 +284,7 @@ static inline int check_pmd_range(struct vm_area_struct *vma, pud_t *pud,
static inline int check_pud_range(struct vm_area_struct *vma, pgd_t *pgd,
unsigned long addr, unsigned long end,
const nodemask_t *nodes, unsigned long flags,
struct list_head *pagelist)
void *private)
{
pud_t *pud;
unsigned long next;
@ -293,7 +295,7 @@ static inline int check_pud_range(struct vm_area_struct *vma, pgd_t *pgd,
if (pud_none_or_clear_bad(pud))
continue;
if (check_pmd_range(vma, pud, addr, next, nodes,
flags, pagelist))
flags, private))
return -EIO;
} while (pud++, addr = next, addr != end);
return 0;
@ -302,7 +304,7 @@ static inline int check_pud_range(struct vm_area_struct *vma, pgd_t *pgd,
static inline int check_pgd_range(struct vm_area_struct *vma,
unsigned long addr, unsigned long end,
const nodemask_t *nodes, unsigned long flags,
struct list_head *pagelist)
void *private)
{
pgd_t *pgd;
unsigned long next;
@ -313,7 +315,7 @@ static inline int check_pgd_range(struct vm_area_struct *vma,
if (pgd_none_or_clear_bad(pgd))
continue;
if (check_pud_range(vma, pgd, addr, next, nodes,
flags, pagelist))
flags, private))
return -EIO;
} while (pgd++, addr = next, addr != end);
return 0;
@ -335,8 +337,7 @@ static inline int vma_migratable(struct vm_area_struct *vma)
*/
static struct vm_area_struct *
check_range(struct mm_struct *mm, unsigned long start, unsigned long end,
const nodemask_t *nodes, unsigned long flags,
struct list_head *pagelist)
const nodemask_t *nodes, unsigned long flags, void *private)
{
int err;
struct vm_area_struct *first, *vma, *prev;
@ -363,7 +364,7 @@ check_range(struct mm_struct *mm, unsigned long start, unsigned long end,
if (vma->vm_start > start)
start = vma->vm_start;
err = check_pgd_range(vma, start, endvma, nodes,
flags, pagelist);
flags, private);
if (err) {
first = ERR_PTR(err);
break;
@ -452,7 +453,8 @@ long do_mbind(unsigned long start, unsigned long len,
int err;
LIST_HEAD(pagelist);
if ((flags & ~(unsigned long)(MPOL_MF_STRICT|MPOL_MF_MOVE|MPOL_MF_MOVE_ALL))
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))
@ -490,8 +492,9 @@ long do_mbind(unsigned long start, unsigned long len,
mode,nodes_addr(nodes)[0]);
down_write(&mm->mmap_sem);
vma = check_range(mm, start, end, nmask, flags,
(flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) ? &pagelist : NULL);
vma = check_range(mm, start, end, nmask,
flags | MPOL_MF_INVERT, &pagelist);
err = PTR_ERR(vma);
if (!IS_ERR(vma)) {
int nr_failed = 0;
@ -646,7 +649,6 @@ int do_migrate_pages(struct mm_struct *mm,
nodemask_t nodes;
nodes_andnot(nodes, *from_nodes, *to_nodes);
nodes_complement(nodes, nodes);
down_read(&mm->mmap_sem);
check_range(mm, mm->mmap->vm_start, TASK_SIZE, &nodes,