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authorSri Krishna chowdary <schowdary@nvidia.com>2018-12-28 00:38:54 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-12-28 12:11:51 -0800
commitd53ce042277a94eadf9a8a31fc41fac54c67dec5 (patch)
tree3da438e716f60f459fead3af0ef0279ad80778c2 /mm/kmemleak.c
parent3c0c12cc8f00ca5f81acb010023b8eb13e9a7004 (diff)
downloadlwn-d53ce042277a94eadf9a8a31fc41fac54c67dec5.tar.gz
lwn-d53ce042277a94eadf9a8a31fc41fac54c67dec5.zip
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: 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>
Diffstat (limited to 'mm/kmemleak.c')
-rw-r--r--mm/kmemleak.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index 9c3d2dea0861..f9d9dc250428 100644
--- a/mm/kmemleak.c
+++ b/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(void)
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");