diff options
authorCatalin Marinas <>2009-06-25 10:16:11 +0100
committerCatalin Marinas <>2009-06-25 10:16:13 +0100
commita9d9058abab4ac17b79d500506e6c74bd16cecdc (patch)
parent28d0325ce6e0a52f53d8af687e6427fee59004d3 (diff)
kmemleak: Allow the early log buffer to be configurable.
(feature suggested by Sergey Senozhatsky) Kmemleak needs to track all the memory allocations but some of these happen before kmemleak is initialised. These are stored in an internal buffer which may be exceeded in some kernel configurations. This patch adds a configuration option with a default value of 400 and also removes the stack dump when the early log buffer is exceeded. Signed-off-by: Catalin Marinas <> Acked-by: Sergey Senozhatsky <>
3 files changed, 19 insertions, 2 deletions
diff --git a/Documentation/kmemleak.txt b/Documentation/kmemleak.txt
index 0112da3b9ab8..f655308064d7 100644
--- a/Documentation/kmemleak.txt
+++ b/Documentation/kmemleak.txt
@@ -41,6 +41,10 @@ Memory scanning parameters can be modified at run-time by writing to the
Kmemleak can also be disabled at boot-time by passing "kmemleak=off" on
the kernel command line.
+Memory may be allocated or freed before kmemleak is initialised and
+these actions are stored in an early log buffer. The size of this buffer
+is configured via the CONFIG_DEBUG_KMEMLEAK_EARLY_LOG_SIZE option.
Basic Algorithm
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 4c32b1a1a06e..12327b2bb785 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -359,6 +359,18 @@ config DEBUG_KMEMLEAK
In order to access the kmemleak file, debugfs needs to be
mounted (usually at /sys/kernel/debug).
+ int "Maximum kmemleak early log entries"
+ depends on DEBUG_KMEMLEAK
+ range 200 2000
+ default 400
+ help
+ Kmemleak must track all the memory allocations to avoid
+ reporting false positives. Since memory may be allocated or
+ freed before kmemleak is initialised, an early log buffer is
+ used to store these actions. If kmemleak reports "early log
+ buffer exceeded", please increase this value.
tristate "Simple test for the kernel memory leak detector"
diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index c96f2c8700aa..17096d1b59b2 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -235,7 +235,7 @@ struct early_log {
/* early logging buffer and current position */
-static struct early_log early_log[200];
+static struct early_log early_log[CONFIG_DEBUG_KMEMLEAK_EARLY_LOG_SIZE];
static int crt_early_log;
static void kmemleak_disable(void);
@@ -696,7 +696,8 @@ static void log_early(int op_type, const void *ptr, size_t size,
struct early_log *log;
if (crt_early_log >= ARRAY_SIZE(early_log)) {
- kmemleak_stop("Early log buffer exceeded\n");
+ pr_warning("Early log buffer exceeded\n");
+ kmemleak_disable();