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| author | Catalin Marinas <catalin.marinas@arm.com> | 2009-06-26 17:38:29 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2009-06-26 17:38:29 +0100 |
| commit | acf4968ec9dea49387ca8b3d36dfaa0850bdb2d5 (patch) | |
| tree | 5854dfdd96744a404a6222b9fc42aa54f9295313 /mm/kmemleak.c | |
| parent | 4698c1f2bbe44ce852ef1a6716973c1f5401a4c4 (diff) | |
| download | lwn-acf4968ec9dea49387ca8b3d36dfaa0850bdb2d5.tar.gz lwn-acf4968ec9dea49387ca8b3d36dfaa0850bdb2d5.zip | |
kmemleak: Slightly change the policy on newly allocated objects
Newly allocated objects are more likely to be reported as false
positives. Kmemleak ignores the reporting of objects younger than 5
seconds. However, this age was calculated after the memory scanning
completed which usually takes longer than 5 seconds. This patch
make the minimum object age calculation in relation to the start of the
memory scanning.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'mm/kmemleak.c')
| -rw-r--r-- | mm/kmemleak.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/mm/kmemleak.c b/mm/kmemleak.c index e96e0ec6a56e..c37e8e50e4de 100644 --- a/mm/kmemleak.c +++ b/mm/kmemleak.c @@ -190,7 +190,9 @@ static unsigned long max_addr; static unsigned long next_scan_yield; static struct task_struct *scan_thread; static unsigned long jiffies_scan_yield; +/* used to avoid reporting of recently allocated objects */ 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 */ @@ -284,7 +286,8 @@ static int color_gray(const struct kmemleak_object *object) static int unreferenced_object(struct kmemleak_object *object) { return (object->flags & OBJECT_ALLOCATED) && color_white(object) && - time_is_before_eq_jiffies(object->jiffies + jiffies_min_age); + time_before_eq(object->jiffies + jiffies_min_age, + jiffies_last_scan); } /* @@ -927,6 +930,8 @@ static void kmemleak_scan(void) int i; int new_leaks = 0; + jiffies_last_scan = jiffies; + /* prepare the kmemleak_object's */ rcu_read_lock(); list_for_each_entry_rcu(object, &object_list, object_list) { |