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Commit d53ce042 authored by Sri Krishna chowdary's avatar Sri Krishna chowdary Committed by Linus Torvalds
Browse files

kmemleak: add config to select auto scan 

Kmemleak scan can be cpu intensive and can stall user tasks at times.  To
prevent this, add config DEBUG_KMEMLEAK_AUTO_SCAN to enable/disable auto
scan on boot up.  Also protect first_run with DEBUG_KMEMLEAK_AUTO_SCAN as
this is meant for only first automatic scan.

Link: http://lkml.kernel.org/r/1540231723-7087-1-git-send-email-prpatel@nvidia.com


Signed-off-by: default avatarSri Krishna chowdary <schowdary@nvidia.com>
Signed-off-by: default avatarSachin Nikam <snikam@nvidia.com>
Signed-off-by: default avatarPrateek <prpatel@nvidia.com>
Reviewed-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 3c0c12cc

lib/Kconfig.debug

+15 −0
Original line number Diff line number Diff line
@@ -593,6 +593,21 @@ config DEBUG_KMEMLEAK_DEFAULT_OFF 
	  Say Y here to disable kmemleak by default. It can then be enabled

	  on the command line via kmemleak=on.



config DEBUG_KMEMLEAK_AUTO_SCAN

	bool "Enable kmemleak auto scan thread on boot up"

	default y

	depends on DEBUG_KMEMLEAK

	help

	  Depending on the cpu, kmemleak scan may be cpu intensive and can

	  stall user tasks at times. This option enables/disables automatic

	  kmemleak scan at boot up.



	  Say N here to disable kmemleak auto scan thread to stop automatic

	  scanning. Disabling this option disables automatic reporting of

	  memory leaks.



	  If unsure, say Y.



config DEBUG_STACK_USAGE

	bool "Stack utilization instrumentation"

	depends on DEBUG_KERNEL && !IA64

mm/kmemleak.c

+6 −4
Original line number Diff line number Diff line
@@ -1650,7 +1650,7 @@ static void kmemleak_scan(void) 
 */

static int kmemleak_scan_thread(void *arg)

{

	static int first_run = 1;

	static int first_run = IS_ENABLED(CONFIG_DEBUG_KMEMLEAK_AUTO_SCAN);



	pr_info("Automatic memory scanning thread started\n");

	set_user_nice(current, 10);
@@ -2144,9 +2144,11 @@ static int __init kmemleak_late_init(void) 
		return -ENOMEM;

	}



	if (IS_ENABLED(CONFIG_DEBUG_KMEMLEAK_AUTO_SCAN)) {

		mutex_lock(&scan_mutex);

		start_scan_thread();

		mutex_unlock(&scan_mutex);

	}



	pr_info("Kernel memory leak detector initialized\n");