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[PATCH] page migration: fail if page is in a vma flagged VM_LOCKED

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page migration currently simply retries a couple of times if try_to_unmap()
fails without inspecting the return code.

However, SWAP_FAIL indicates that the page is in a vma that has the
VM_LOCKED flag set (if ignore_refs ==1).  We can check for that return code
and avoid retrying the migration.

migrate_page_remove_references() now needs to return a reason why the
failure occured.  So switch migrate_page_remove_references to use -Exx
style error messages.

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 2006-03-14 19:50:19 -08:00 • committed by Linus Torvalds
commit 4983da07f1
2 changed files with 16 additions and 8 deletions
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6
fs/buffer.c
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@ -3060,6 +3060,7 @@ int buffer_migrate_page(struct page *newpage, struct page *page)
{
struct address_space *mapping = page->mapping;
struct buffer_head *bh, *head;
int rc;
if (!mapping)
return -EAGAIN;
@ -3069,8 +3070,9 @@ int buffer_migrate_page(struct page *newpage, struct page *page)
head = page_buffers(page);
if (migrate_page_remove_references(newpage, page, 3))
return -EAGAIN;
rc = migrate_page_remove_references(newpage, page, 3);
if (rc)
return rc;
bh = head;
do {