[patch] vmscan: print shrink_slab symbol name on negative shrinkerobjects

[David Rientjes]

When a shrinker has a negative number of objects to delete, the symbol
name of the shrinker should be printed, not shrink_slab.

Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
---
 mm/vmscan.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -40,6 +40,7 @@
 #include <linux/memcontrol.h>
 #include <linux/delayacct.h>
 #include <linux/sysctl.h>
+#include <linux/kallsyms.h>
 
 #include <asm/tlbflush.h>
 #include <asm/div64.h>
@@ -214,8 +215,12 @@ unsigned long shrink_slab(unsigned long scanned, gfp_t gfp_mask,
 		do_div(delta, lru_pages + 1);
 		shrinker->nr += delta;
 		if (shrinker->nr < 0) {
-			printk(KERN_ERR "%s: nr=%ld\n",
-					__func__, shrinker->nr);
+			char symname[KSYM_NAME_LEN];
+
+			if (lookup_symbol_name((unsigned long)shrinker->shrink,
+					       symname) > 0)
+				printk(KERN_ERR "shrink_slab: %s nr=%ld\n",
+				       symname, shrinker->nr);
 			shrinker->nr = max_pass;
 		}
 
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