Messages in this thread Patch in this message | | | From | Hui Zhu <> | Subject | [PATCH] Fix the issue that lowmemkiller fell into a cycle that try to kill a task | Date | Tue, 23 Sep 2014 10:57:09 +0800 |
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The cause of this issue is when free memroy size is low and a lot of task is trying to shrink the memory, the task that is killed by lowmemkiller cannot get CPU to exit itself.
Fix this issue with change the scheduling policy to SCHED_FIFO if a task's flag is TIF_MEMDIE in lowmemkiller.
Signed-off-by: Hui Zhu <zhuhui@xiaomi.com> --- drivers/staging/android/lowmemorykiller.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/staging/android/lowmemorykiller.c b/drivers/staging/android/lowmemorykiller.c index b545d3d..ca1ffac 100644 --- a/drivers/staging/android/lowmemorykiller.c +++ b/drivers/staging/android/lowmemorykiller.c @@ -129,6 +129,10 @@ static unsigned long lowmem_scan(struct shrinker *s, struct shrink_control *sc) if (test_tsk_thread_flag(p, TIF_MEMDIE) && time_before_eq(jiffies, lowmem_deathpending_timeout)) { + struct sched_param param = { .sched_priority = 1 }; + + if (p->policy == SCHED_NORMAL) + sched_setscheduler(p, SCHED_FIFO, ¶m); task_unlock(p); rcu_read_unlock(); return 0; -- 1.9.1
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