mm: oom analysis: Show kernel stack usage in /proc/meminfo and OOM log output

The amount of memory allocated to kernel stacks can become significant and
cause OOM conditions.  However, we do not display the amount of memory
consumed by stacks.

Add code to display the amount of memory used for stacks in /proc/meminfo.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: Christoph Lameter <cl@linux-foundation.org>
Reviewed-by: Minchan Kim <minchan.kim@gmail.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>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index d5c410d47fae..1fc588f430e4 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -84,6 +84,7 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
                 "Slab:           %8lu kB\n"
                 "SReclaimable:   %8lu kB\n"
                 "SUnreclaim:     %8lu kB\n"
+                "KernelStack:    %8lu kB\n"
                 "PageTables:     %8lu kB\n"
 #ifdef CONFIG_QUICKLIST
                 "Quicklists:     %8lu kB\n"
@@ -128,6 +129,7 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
                                 global_page_state(NR_SLAB_UNRECLAIMABLE)),
                 K(global_page_state(NR_SLAB_RECLAIMABLE)),
                 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
+                global_page_state(NR_KERNEL_STACK) * THREAD_SIZE / 1024,
                 K(global_page_state(NR_PAGETABLE)),
 #ifdef CONFIG_QUICKLIST
                 K(quicklist_total_size()),