mm: oom analysis: add buffer cache information to show_free_areas()

It is often useful to know the statistics for all pages that are handled
like page cache pages when looking at OOM log output.

Therefore show_free_areas() should also display buffer cache statistics.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: Wu Fengguang <fengguang.wu@intel.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 8fbf5a4f5cf7a46b58bc0d3a50546ceeef1310c2..494c09196c30a07ca6b690844933a3d7a5b1a41c 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2137,7 +2137,7 @@ void show_free_areas(void)
        printk("Active_anon:%lu active_file:%lu inactive_anon:%lu\n"
                " inactive_file:%lu"
                " unevictable:%lu"
-               " dirty:%lu writeback:%lu unstable:%lu\n"
+               " dirty:%lu writeback:%lu unstable:%lu buffer:%lu\n"
                " free:%lu slab_reclaimable:%lu slab_unreclaimable:%lu\n"
                " mapped:%lu pagetables:%lu bounce:%lu\n",
                global_page_state(NR_ACTIVE_ANON),
@@ -2148,6 +2148,7 @@ void show_free_areas(void)
                global_page_state(NR_FILE_DIRTY),
                global_page_state(NR_WRITEBACK),
                global_page_state(NR_UNSTABLE_NFS),
+               nr_blockdev_pages(),
                global_page_state(NR_FREE_PAGES),
                global_page_state(NR_SLAB_RECLAIMABLE),
                global_page_state(NR_SLAB_UNRECLAIMABLE),