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

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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
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@ -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)