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-rw-r--r--mm/swap.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/mm/swap.c b/mm/swap.c
index 77825883298f..f76c76c7501b 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -446,13 +446,22 @@ void mark_page_accessed(struct page *page)
}
EXPORT_SYMBOL(mark_page_accessed);
+/*
+ * Order of operations is important: flush the pagevec when it's already
+ * full, not when adding the last page, to make sure that last page is
+ * not added to the LRU directly when passed to this function. Because
+ * mark_page_accessed() (called after this when writing) only activates
+ * pages that are on the LRU, linear writes in subpage chunks would see
+ * every PAGEVEC_SIZE page activated, which is unexpected.
+ */
void __lru_cache_add(struct page *page, enum lru_list lru)
{
struct pagevec *pvec = &get_cpu_var(lru_add_pvecs)[lru];
page_cache_get(page);
- if (!pagevec_add(pvec, page))
+ if (!pagevec_space(pvec))
__pagevec_lru_add(pvec, lru);
+ pagevec_add(pvec, page);
put_cpu_var(lru_add_pvecs);
}
EXPORT_SYMBOL(__lru_cache_add);