diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 52fd92b2c1fe3f83bb26b3b27416aca123f4556f..c9c02b23f02f3e90d768ff78c32dba020746024b 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5800,14 +5800,14 @@ long si_mem_available(void)
 
 	/*
 	 * Estimate the amount of memory available for userspace allocations,
-	 * without causing swapping.
+	 * without causing swapping or OOM.
 	 */
 	available = global_zone_page_state(NR_FREE_PAGES) - totalreserve_pages;
 
 	/*
 	 * Not all the page cache can be freed, otherwise the system will
-	 * start swapping. Assume at least half of the page cache, or the
-	 * low watermark worth of cache, needs to stay.
+	 * start swapping or thrashing. Assume at least half of the page
+	 * cache, or the low watermark worth of cache, needs to stay.
 	 */
 	pagecache = pages[LRU_ACTIVE_FILE] + pages[LRU_INACTIVE_FILE];
 	pagecache -= min(pagecache / 2, wmark_low);