[PATCH] print order information when OOM killing

Dump the current allocation order when OOM killing.
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

drivers/char/sysrq.c

@@ -228,7 +228,7 @@ static struct sysrq_key_op sysrq_term_op = {
 
 static void moom_callback(void *ignored)
 {
-	out_of_memory(GFP_KERNEL);
+	out_of_memory(GFP_KERNEL, 0);
 }
 
 static DECLARE_WORK(moom_work, moom_callback, NULL);

include/linux/swap.h

@@ -148,7 +148,7 @@ struct swap_list_t {
 #define vm_swap_full() (nr_swap_pages*2 < total_swap_pages)
 
 /* linux/mm/oom_kill.c */
-extern void out_of_memory(unsigned int __nocast gfp_mask);
+extern void out_of_memory(unsigned int __nocast gfp_mask, int order);
 
 /* linux/mm/memory.c */
 extern void swapin_readahead(swp_entry_t, unsigned long, struct vm_area_struct *);

mm/oom_kill.c

@@ -253,12 +253,12 @@ static struct mm_struct *oom_kill_process(struct task_struct *p)
  * OR try to be smart about which process to kill. Note that we
  * don't have to be perfect here, we just have to be good.
  */
-void out_of_memory(unsigned int __nocast gfp_mask)
+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\n", gfp_mask);
+	printk("oom-killer: gfp_mask=0x%x, order=%d\n", gfp_mask, order);
 	/* print memory stats */
 	show_mem();
 

mm/page_alloc.c

@@ -936,7 +936,7 @@ __alloc_pages(unsigned int __nocast gfp_mask, unsigned int order,
 				goto got_pg;
 		}
 
-		out_of_memory(gfp_mask);
+		out_of_memory(gfp_mask, order);
 		goto restart;
 	}