Update Linux to v5.10.157
Sourced from [1]
[1] https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.10.157.tar.xz
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: I7b30d9e98d8c465d6b44de8e7433b4a40b3289ba
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 419a814..3d7c557 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -633,7 +633,7 @@
*/
set_bit(MMF_OOM_SKIP, &mm->flags);
- /* Drop a reference taken by wake_oom_reaper */
+ /* Drop a reference taken by queue_oom_reaper */
put_task_struct(tsk);
}
@@ -643,12 +643,12 @@
struct task_struct *tsk = NULL;
wait_event_freezable(oom_reaper_wait, oom_reaper_list != NULL);
- spin_lock(&oom_reaper_lock);
+ spin_lock_irq(&oom_reaper_lock);
if (oom_reaper_list != NULL) {
tsk = oom_reaper_list;
oom_reaper_list = tsk->oom_reaper_list;
}
- spin_unlock(&oom_reaper_lock);
+ spin_unlock_irq(&oom_reaper_lock);
if (tsk)
oom_reap_task(tsk);
@@ -657,20 +657,46 @@
return 0;
}
-static void wake_oom_reaper(struct task_struct *tsk)
+static void wake_oom_reaper(struct timer_list *timer)
+{
+ struct task_struct *tsk = container_of(timer, struct task_struct,
+ oom_reaper_timer);
+ struct mm_struct *mm = tsk->signal->oom_mm;
+ unsigned long flags;
+
+ /* The victim managed to terminate on its own - see exit_mmap */
+ if (test_bit(MMF_OOM_SKIP, &mm->flags)) {
+ put_task_struct(tsk);
+ return;
+ }
+
+ spin_lock_irqsave(&oom_reaper_lock, flags);
+ tsk->oom_reaper_list = oom_reaper_list;
+ oom_reaper_list = tsk;
+ spin_unlock_irqrestore(&oom_reaper_lock, flags);
+ trace_wake_reaper(tsk->pid);
+ wake_up(&oom_reaper_wait);
+}
+
+/*
+ * Give the OOM victim time to exit naturally before invoking the oom_reaping.
+ * The timers timeout is arbitrary... the longer it is, the longer the worst
+ * case scenario for the OOM can take. If it is too small, the oom_reaper can
+ * get in the way and release resources needed by the process exit path.
+ * e.g. The futex robust list can sit in Anon|Private memory that gets reaped
+ * before the exit path is able to wake the futex waiters.
+ */
+#define OOM_REAPER_DELAY (2*HZ)
+static void queue_oom_reaper(struct task_struct *tsk)
{
/* mm is already queued? */
if (test_and_set_bit(MMF_OOM_REAP_QUEUED, &tsk->signal->oom_mm->flags))
return;
get_task_struct(tsk);
-
- spin_lock(&oom_reaper_lock);
- tsk->oom_reaper_list = oom_reaper_list;
- oom_reaper_list = tsk;
- spin_unlock(&oom_reaper_lock);
- trace_wake_reaper(tsk->pid);
- wake_up(&oom_reaper_wait);
+ timer_setup(&tsk->oom_reaper_timer, wake_oom_reaper, 0);
+ tsk->oom_reaper_timer.expires = jiffies + OOM_REAPER_DELAY;
+ add_timer(&tsk->oom_reaper_timer);
}
static int __init oom_init(void)
@@ -680,7 +706,7 @@
}
subsys_initcall(oom_init)
#else
-static inline void wake_oom_reaper(struct task_struct *tsk)
+static inline void queue_oom_reaper(struct task_struct *tsk)
{
}
#endif /* CONFIG_MMU */
@@ -931,7 +957,7 @@
rcu_read_unlock();
if (can_oom_reap)
- wake_oom_reaper(victim);
+ queue_oom_reaper(victim);
mmdrop(mm);
put_task_struct(victim);
@@ -967,7 +993,7 @@
task_lock(victim);
if (task_will_free_mem(victim)) {
mark_oom_victim(victim);
- wake_oom_reaper(victim);
+ queue_oom_reaper(victim);
task_unlock(victim);
put_task_struct(victim);
return;
@@ -1065,7 +1091,7 @@
*/
if (task_will_free_mem(current)) {
mark_oom_victim(current);
- wake_oom_reaper(current);
+ queue_oom_reaper(current);
return true;
}