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-rw-r--r--mm/vmscan.c36
1 files changed, 26 insertions, 10 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index dfb342e..e5aaaad 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -582,11 +582,8 @@ static unsigned long shrink_page_list(struct list_head *page_list,
sc->nr_scanned++;
- if (unlikely(!page_evictable(page, NULL))) {
- unlock_page(page);
- putback_lru_page(page);
- continue;
- }
+ if (unlikely(!page_evictable(page, NULL)))
+ goto cull_mlocked;
if (!sc->may_swap && page_mapped(page))
goto keep_locked;
@@ -624,9 +621,19 @@ static unsigned long shrink_page_list(struct list_head *page_list,
* Anonymous process memory has backing store?
* Try to allocate it some swap space here.
*/
- if (PageAnon(page) && !PageSwapCache(page))
+ if (PageAnon(page) && !PageSwapCache(page)) {
+ switch (try_to_munlock(page)) {
+ case SWAP_FAIL: /* shouldn't happen */
+ case SWAP_AGAIN:
+ goto keep_locked;
+ case SWAP_MLOCK:
+ goto cull_mlocked;
+ case SWAP_SUCCESS:
+ ; /* fall thru'; add to swap cache */
+ }
if (!add_to_swap(page, GFP_ATOMIC))
goto activate_locked;
+ }
#endif /* CONFIG_SWAP */
mapping = page_mapping(page);
@@ -641,6 +648,8 @@ static unsigned long shrink_page_list(struct list_head *page_list,
goto activate_locked;
case SWAP_AGAIN:
goto keep_locked;
+ case SWAP_MLOCK:
+ goto cull_mlocked;
case SWAP_SUCCESS:
; /* try to free the page below */
}
@@ -731,6 +740,11 @@ free_it:
}
continue;
+cull_mlocked:
+ unlock_page(page);
+ putback_lru_page(page);
+ continue;
+
activate_locked:
/* Not a candidate for swapping, so reclaim swap space. */
if (PageSwapCache(page) && vm_swap_full())
@@ -742,7 +756,7 @@ keep_locked:
unlock_page(page);
keep:
list_add(&page->lru, &ret_pages);
- VM_BUG_ON(PageLRU(page));
+ VM_BUG_ON(PageLRU(page) || PageUnevictable(page));
}
list_splice(&ret_pages, page_list);
if (pagevec_count(&freed_pvec))
@@ -2329,12 +2343,13 @@ int zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
* @vma: the VMA in which the page is or will be mapped, may be NULL
*
* Test whether page is evictable--i.e., should be placed on active/inactive
- * lists vs unevictable list.
+ * lists vs unevictable list. The vma argument is !NULL when called from the
+ * fault path to determine how to instantate a new page.
*
* Reasons page might not be evictable:
* (1) page's mapping marked unevictable
+ * (2) page is part of an mlocked VMA
*
- * TODO - later patches
*/
int page_evictable(struct page *page, struct vm_area_struct *vma)
{
@@ -2342,7 +2357,8 @@ int page_evictable(struct page *page, struct vm_area_struct *vma)
if (mapping_unevictable(page_mapping(page)))
return 0;
- /* TODO: test page [!]evictable conditions */
+ if (PageMlocked(page) || (vma && is_mlocked_vma(vma, page)))
+ return 0;
return 1;
}
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