kmemleak: Allow the early log buffer to be configurable. (a9d9058a) · Commits · 戴 / test

Documentation/kmemleak.txt

+4 −0

Original line number	Diff line number	Diff line
		@@ -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
		---------------

+12 −0

Original line number	Diff line number	Diff line
		@@ -359,6 +359,18 @@ config DEBUG_KMEMLEAK
		In order to access the kmemleak file, debugfs needs to be
		mounted (usually at /sys/kernel/debug).

		config DEBUG_KMEMLEAK_EARLY_LOG_SIZE
		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.

		config DEBUG_KMEMLEAK_TEST
		tristate "Simple test for the kernel memory leak detector"
		depends on DEBUG_KMEMLEAK

+3 −2

Original line number	Diff line number	Diff line
		@@ -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();
		return;
		}