* the page.
*/
if (!mapping || page_mapcount(page) + nr_refs != page_count(page))
- return 1;
+ return -EAGAIN;
/*
* Establish swap ptes for anonymous pages or destroy pte
* If the page was not migrated then the PageSwapCache bit
* is still set and the operation may continue.
*/
- try_to_unmap(page, 1);
+ if (try_to_unmap(page, 1) == SWAP_FAIL)
+ /* A vma has VM_LOCKED set -> Permanent failure */
+ return -EPERM;
/*
* Give up if we were unable to remove all mappings.
*/
if (page_mapcount(page))
- return 1;
+ return -EAGAIN;
write_lock_irq(&mapping->tree_lock);
if (!page_mapping(page) || page_count(page) != nr_refs ||
*radix_pointer != page) {
write_unlock_irq(&mapping->tree_lock);
- return 1;
+ return -EAGAIN;
}
/*
*/
int migrate_page(struct page *newpage, struct page *page)
{
+ int rc;
+
BUG_ON(PageWriteback(page)); /* Writeback must be complete */
- if (migrate_page_remove_references(newpage, page, 2))
- return -EAGAIN;
+ rc = migrate_page_remove_references(newpage, page, 2);
+
+ if (rc)
+ return rc;
migrate_page_copy(newpage, page);
if (!(gfp_mask & __GFP_WAIT) ||
zone->all_unreclaimable ||
- atomic_read(&zone->reclaim_in_progress) > 0)
+ atomic_read(&zone->reclaim_in_progress) > 0 ||
+ (p->flags & PF_MEMALLOC))
return 0;
node_id = zone->zone_pgdat->node_id;
sc.swap_cluster_max = SWAP_CLUSTER_MAX;
cond_resched();
- p->flags |= PF_MEMALLOC;
+ /*
+ * We need to be able to allocate from the reserves for RECLAIM_SWAP
+ * and we also need to be able to write out pages for RECLAIM_WRITE
+ * and RECLAIM_SWAP.
+ */
+ p->flags |= PF_MEMALLOC | PF_SWAPWRITE;
reclaim_state.reclaimed_slab = 0;
p->reclaim_state = &reclaim_state;
* a long time.
*/
shrink_slab(sc.nr_scanned, gfp_mask, order);
- sc.nr_reclaimed = 1; /* Avoid getting the off node timeout */
}
p->reclaim_state = NULL;
- current->flags &= ~PF_MEMALLOC;
+ current->flags &= ~(PF_MEMALLOC | PF_SWAPWRITE);
if (sc.nr_reclaimed == 0)
zone->last_unsuccessful_zone_reclaim = jiffies;