The patch titled
Subject: kmemleak: add config to select auto scan
has been added to the -mm tree. Its filename is
kmemleak-add-config-to-select-auto-scan.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/kmemleak-add-config-to-select-auto-scan.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/kmemleak-add-config-to-select-auto-scan.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Sri Krishna chowdary <schowdary@xxxxxxxxxx>
Subject: 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@xxxxxxxxxx
Signed-off-by: Sri Krishna chowdary <schowdary@xxxxxxxxxx>
Signed-off-by: Sachin Nikam <snikam@xxxxxxxxxx>
Signed-off-by: Prateek <prpatel@xxxxxxxxxx>
Reviewed-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
--- a/lib/Kconfig.debug~kmemleak-add-config-to-select-auto-scan
+++ a/lib/Kconfig.debug
@@ -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
--- a/mm/kmemleak.c~kmemleak-add-config-to-select-auto-scan
+++ a/mm/kmemleak.c
@@ -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(voi
return -ENOMEM;
}
- mutex_lock(&scan_mutex);
- start_scan_thread();
- mutex_unlock(&scan_mutex);
+ 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");
_
Patches currently in -mm which might be from schowdary@xxxxxxxxxx are
kmemleak-add-config-to-select-auto-scan.patch
