[PATCH] mm: quieten OOM killer noise

We now print statistics when invoking the OOM killer, however this
information is not rate limited and you can get into situations where the
console is continually spammed.

For example, when a task is exiting the OOM killer will simply return
(waiting for that task to exit and clear up memory).  If the VM continually
calls back into the OOM killer we get thousands of copies of show_mem() on
the console.

Use printk_ratelimit() to quieten it.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index e20d559edbaf5f48bed72b20ceda0422c63befb5..1e56076672f5870e9766753270d77442e5743ac9 100644 (file)
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -258,9 +258,11 @@ void out_of_memory(unsigned int __nocast gfp_mask, int order)
        struct mm_struct *mm = NULL;
        task_t * p;
 
-       printk("oom-killer: gfp_mask=0x%x, order=%d\n", gfp_mask, order);
-       /* print memory stats */
-       show_mem();
+       if (printk_ratelimit()) {
+               printk("oom-killer: gfp_mask=0x%x, order=%d\n",
+                       gfp_mask, order);
+               show_mem();
+       }
 
        read_lock(&tasklist_lock);
 retry: