[PATCH V2] mm: add show num_poisoned_pages when oom

[Xishi Qiu]

Show num_poisoned_pages when oom, it is a little helpful to find the reason.
Also it will be emitted anytime show_mem() is called.

Signed-off-by: Xishi Qiu <qiuxishi@xxxxxxxxxx>
Suggested-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxx>
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
---
 lib/show_mem.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/lib/show_mem.c b/lib/show_mem.c
index 5847a49..1cbdcd8 100644
--- a/lib/show_mem.c
+++ b/lib/show_mem.c
@@ -46,4 +46,7 @@ void show_mem(unsigned int filter)
 	printk("%lu pages in pagetable cache\n",
 		quicklist_total_size());
 #endif
+#ifdef CONFIG_MEMORY_FAILURE
+	printk("%lu pages hwpoisoned\n", atomic_long_read(&num_poisoned_pages));
+#endif
 }
-- 
1.7.1


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