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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>
This commit is contained in:
Sergey Senozhatsky 2009-08-27 14:29:18 +01:00 committed by Catalin Marinas
parent 008139d914
commit 0494e08281
1 changed files with 39 additions and 0 deletions
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39
mm/kmemleak.c
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@ -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) */
@ -258,6 +267,35 @@ static void kmemleak_disable(void);
kmemleak_disable(); \
} 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)
@ -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++) {