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kmemleak: add config to select auto scan

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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: Sri Krishna chowdary <schowdary@nvidia.com>
Signed-off-by: Sachin Nikam <snikam@nvidia.com>
Signed-off-by: Prateek <prpatel@nvidia.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sri Krishna chowdary 2018-12-28 00:38:54 -08:00 • committed by Linus Torvalds
parent 3c0c12cc8f
commit d53ce04227
2 changed files with 21 additions and 4 deletions
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15
lib/Kconfig.debug
View file

@ -593,6 +593,21 @@ config DEBUG_KMEMLEAK_DEFAULT_OFF
Say Y here to disable kmemleak by default. It can then be enabled Say Y here to disable kmemleak by default. It can then be enabled
on the command line via kmemleak=on. 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 config DEBUG_STACK_USAGE
bool "Stack utilization instrumentation" bool "Stack utilization instrumentation"
depends on DEBUG_KERNEL && !IA64 depends on DEBUG_KERNEL && !IA64

10
mm/kmemleak.c
View file

@ -1650,7 +1650,7 @@ static void kmemleak_scan(void)
*/ */
static int kmemleak_scan_thread(void *arg) 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"); pr_info("Automatic memory scanning thread started\n");
set_user_nice(current, 10); set_user_nice(current, 10);
@ -2144,9 +2144,11 @@ static int __init kmemleak_late_init(void)
return -ENOMEM; return -ENOMEM;
} }
mutex_lock(&scan_mutex); if (IS_ENABLED(CONFIG_DEBUG_KMEMLEAK_AUTO_SCAN)) {
start_scan_thread(); mutex_lock(&scan_mutex);
mutex_unlock(&scan_mutex); start_scan_thread();
mutex_unlock(&scan_mutex);
}
pr_info("Kernel memory leak detector initialized\n"); pr_info("Kernel memory leak detector initialized\n");