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authorSergey Senozhatsky <sergey.senozhatsky@mail.by>2009-08-27 17:29:18 +0400
committerCatalin Marinas <catalin.marinas@arm.com>2009-08-27 17:29:18 +0400
commit0494e08281d08f0a3dc442eb5e5cecc125b53b27 (patch)
tree2050fee8744a101a25b84a45dc8abf4966ca00b6 /mm/kmemleak.c
parent008139d9146f9afee0e58df4b7422d0c9921f8ce (diff)
downloadlinux-0494e08281d08f0a3dc442eb5e5cecc125b53b27.tar.xz
kmemleak: Printing of the objects hex dump
Introducing printing of the objects hex dump to the seq file. The number of lines to be printed is limited to HEX_MAX_LINES to prevent seq file spamming. The actual number of printed bytes is less than or equal to (HEX_MAX_LINES * HEX_ROW_SIZE). (slight adjustments by Catalin Marinas) Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@mail.by> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'mm/kmemleak.c')
-rw-r--r--mm/kmemleak.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index 8172154502a6..1d7645b0a97c 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -162,6 +162,15 @@ struct kmemleak_object {
/* flag set on newly allocated objects */
#define OBJECT_NEW (1 << 3)
+/* number of bytes to print per line; must be 16 or 32 */
+#define HEX_ROW_SIZE 16
+/* number of bytes to print at a time (1, 2, 4, 8) */
+#define HEX_GROUP_SIZE 1
+/* include ASCII after the hex output */
+#define HEX_ASCII 1
+/* max number of lines to be printed */
+#define HEX_MAX_LINES 2
+
/* the list of all allocated objects */
static LIST_HEAD(object_list);
/* the list of gray-colored objects (see color_gray comment below) */
@@ -259,6 +268,35 @@ static void kmemleak_disable(void);
} while (0)
/*
+ * Printing of the objects hex dump to the seq file. The number of lines to be
+ * printed is limited to HEX_MAX_LINES to prevent seq file spamming. The
+ * actual number of printed bytes depends on HEX_ROW_SIZE. It must be called
+ * with the object->lock held.
+ */
+static void hex_dump_object(struct seq_file *seq,
+ struct kmemleak_object *object)
+{
+ const u8 *ptr = (const u8 *)object->pointer;
+ int i, len, remaining;
+ unsigned char linebuf[HEX_ROW_SIZE * 5];
+
+ /* limit the number of lines to HEX_MAX_LINES */
+ remaining = len =
+ min(object->size, (size_t)(HEX_MAX_LINES * HEX_ROW_SIZE));
+
+ seq_printf(seq, " hex dump (first %d bytes):\n", len);
+ for (i = 0; i < len; i += HEX_ROW_SIZE) {
+ int linelen = min(remaining, HEX_ROW_SIZE);
+
+ remaining -= HEX_ROW_SIZE;
+ hex_dump_to_buffer(ptr + i, linelen, HEX_ROW_SIZE,
+ HEX_GROUP_SIZE, linebuf, sizeof(linebuf),
+ HEX_ASCII);
+ seq_printf(seq, " %s\n", linebuf);
+ }
+}
+
+/*
* Object colors, encoded with count and min_count:
* - white - orphan object, not enough references to it (count < min_count)
* - gray - not orphan, not marked as false positive (min_count == 0) or
@@ -308,6 +346,7 @@ static void print_unreferenced(struct seq_file *seq,
object->pointer, object->size);
seq_printf(seq, " comm \"%s\", pid %d, jiffies %lu\n",
object->comm, object->pid, object->jiffies);
+ hex_dump_object(seq, object);
seq_printf(seq, " backtrace:\n");
for (i = 0; i < object->trace_len; i++) {