tools/vm/slabinfo: Handle files in debugfs

Commit 64dd68497be76 relocated and renamed the alloc_calls and free_calls files from /sys/kernel/slab/NAME/*_calls over to /sys/kernel/debug/slab/NAME/*_calls but didn't update the slabinfo tool with the new location.

This change will now have slabinfo look at the new location (and filenames) with a fallback to the prior files.

Fixes 64dd68497be76 ("mm: slub: move sysfs slab alloc/free interfaces to debugfs")

Cc [email protected]

Signed-off-by Stéphane Graber <[email protected]>

Tested-by Stéphane Graber <[email protected]>

---
 tools/vm/slabinfo.c | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

tools/vm/slabinfo.c +24 -2

index 9b68658b6bb8..5b98f3ee58a5 100644
@@ -233,6 +233,24 @@ static unsigned long read_slab_obj(struct slabinfo *s, const char *name)
 	return l;
 }
 
+static unsigned long read_debug_slab_obj(struct slabinfo *s, const char *name)
+{
+	char x[128];
+	FILE *f;
+	size_t l;
+
+	snprintf(x, 128, "/sys/kernel/debug/slab/%s/%s", s->name, name);
+	f = fopen(x, "r");
+	if (!f) {
+		buffer[0] = 0;
+		l = 0;
+	} else {
+		l = fread(buffer, 1, sizeof(buffer), f);
+		buffer[l] = 0;
+		fclose(f);
+	}
+	return l;
+}
 
 /*
  * Put a size string together

@@ -409,14 +427,18 @@ static void show_tracking(struct slabinfo *s)
 {
 	printf("\n%s: Kernel object allocation\n", s->name);
 	printf("-----------------------------------------------------------------------\n");
-	if (read_slab_obj(s, "alloc_calls"))
+	if (read_debug_slab_obj(s, "alloc_traces"))
+		printf("%s", buffer);
+	else if (read_slab_obj(s, "alloc_calls"))
 		printf("%s", buffer);
 	else
 		printf("No Data\n");
 
 	printf("\n%s: Kernel object freeing\n", s->name);
 	printf("------------------------------------------------------------------------\n");
-	if (read_slab_obj(s, "free_calls"))
+	if (read_debug_slab_obj(s, "free_traces"))
+		printf("%s", buffer);
+	else if (read_slab_obj(s, "free_calls"))
 		printf("%s", buffer);
 	else
 		printf("No Data\n");