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kmemleak : Make kmemleak_stack_scan optional using config 

Currently we have kmemleak_stack_scan enabled by default.
This can hog the cpu with pre-emption disabled for a long
time starving other tasks.

Make this optional at compile time, since if required
we can always write to sysfs entry and enable this option.

Change-Id: Ie30447861c942337c7ff25ac269b6025a527e8eb
Signed-off-by: Vignesh Radhakrishnan <vigneshr@codeaurora.org>
This commit is contained in:
Vignesh Radhakrishnan 2015-01-22 11:43:45 +05:30
parent 93a10a8b28
commit 7f15dd8a75
2 changed files with 20 additions and 1 deletions
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9
lib/Kconfig.debug
View File

@ -544,6 +544,15 @@ 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_TASK_STACK_SCAN_OFF
bool "Disable kmemleak task stack scan by default"
depends on DEBUG_KMEMLEAK
help
Say Y here to disable kmemleak task stack scan by default
at compile time. It can be enabled later if required by
writing to the debugfs entry :
echo "stack=on" > /sys/kernel/debug/kmemleak.
config DEBUG_PREEMPT
bool "Debug preemptible kernel"
depends on DEBUG_KERNEL && PREEMPT && TRACE_IRQFLAGS_SUPPORT

12
mm/kmemleak.c
View File

@ -212,8 +212,18 @@ static unsigned long jiffies_min_age;
static unsigned long jiffies_last_scan;
/* delay between automatic memory scannings */
static signed long jiffies_scan_wait;
/* enables or disables the task stacks scanning */
/* Enables or disables the task stacks scanning.
* Set to 1 if at compile time we want it enabled.
* Else set to 0 to have it disabled by default.
* This can be enabled by writing to "stack=on" using
* kmemleak debugfs entry.*/
#ifdef CONFIG_DEBUG_TASK_STACK_SCAN_OFF
static int kmemleak_stack_scan;
#else
static int kmemleak_stack_scan = 1;
#endif
/* protects the memory scanning, parameters and debug/kmemleak file access */
static DEFINE_MUTEX(scan_mutex);
/* setting kmemleak=on, will set this var, skipping the disable */