1 files changed, 5 insertions, 1 deletions

diff --git a/mm/fadvise.c b/mm/fadvise.c
index 3bcfd81db45e..2ad7adf4f0a4 100644
--- a/mm/fadvise.c
+++ b/mm/fadvise.c
@@ -117,7 +117,11 @@ SYSCALL_DEFINE4(fadvise64_64, int, fd, loff_t, offset, loff_t, len, int, advice)
                         __filemap_fdatawrite_range(mapping, offset, endbyte,
                                                    WB_SYNC_NONE);
 
-                /* First and last FULL page! */
+                /*
+                 * First and last FULL page! Partial pages are deliberately
+                 * preserved on the expectation that it is better to preserve
+                 * needed memory than to discard unneeded memory.
+                 */
                 start_index = (offset+(PAGE_CACHE_SIZE-1)) >> PAGE_CACHE_SHIFT;
                 end_index = (endbyte >> PAGE_CACHE_SHIFT);