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[PATCH] page migration: Fail with error if swap not setup 

Currently the migration of anonymous pages will silently fail if no swap is
setup.  This patch makes page migration functions check for available swap
and fail with -ENODEV if no swap space is available.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Christoph Lameter 2006-03-16 23:03:59 -08:00 committed by Linus Torvalds
parent e0e8eb54d8
commit 90036ee593
1 changed files with 12 additions and 2 deletions
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14
mm/mempolicy.c
View File

@ -330,9 +330,19 @@ check_range(struct mm_struct *mm, unsigned long start, unsigned long end,
int err;
struct vm_area_struct *first, *vma, *prev;
/* Clear the LRU lists so pages can be isolated */
if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL))
if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) {
/* Must have swap device for migration */
if (nr_swap_pages <= 0)
return ERR_PTR(-ENODEV);
/*
* Clear the LRU lists so pages can be isolated.
* Note that pages may be moved off the LRU after we have
* drained them. Those pages will fail to migrate like other
* pages that may be busy.
*/
lru_add_drain_all();
}
first = find_vma(mm, start);
if (!first)