evie/android_kernel_oneplus_msm8998
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Merge "lowmemorykiller: fix scan_mutex contention"

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Linux Build Service Account 2017-04-18 13:57:03 -07:00 • committed by Gerrit - the friendly Code Review server
commit ce87c90172
1 changed files with 28 additions and 3 deletions
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31
drivers/staging/android/lowmemorykiller.c
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@ -217,6 +217,22 @@ static int test_task_flag(struct task_struct *p, int flag)
return 0;
}
static int test_task_state(struct task_struct *p, int state)
{
struct task_struct *t;
for_each_thread(p, t) {
task_lock(t);
if (t->state & state) {
task_unlock(t);
return 1;
}
task_unlock(t);
}
return 0;
}
static DEFINE_MUTEX(scan_mutex);
int can_use_cma_pages(gfp_t gfp_mask)
@ -404,7 +420,7 @@ static unsigned long lowmem_scan(struct shrinker *s, struct shrink_control *sc)
int other_free;
int other_file;
if (mutex_lock_interruptible(&scan_mutex) < 0)
if (!mutex_trylock(&scan_mutex))
return 0;
other_free = global_page_state(NR_FREE_PAGES);
@ -462,8 +478,6 @@ static unsigned long lowmem_scan(struct shrinker *s, struct shrink_control *sc)
if (time_before_eq(jiffies, lowmem_deathpending_timeout)) {
if (test_task_flag(tsk, TIF_MEMDIE)) {
rcu_read_unlock();
/* give the system time to free up the memory */
msleep_interruptible(20);
mutex_unlock(&scan_mutex);
return 0;
}
@ -497,6 +511,17 @@ static unsigned long lowmem_scan(struct shrinker *s, struct shrink_control *sc)
}
if (selected) {
long cache_size, cache_limit, free;
if (test_task_flag(selected, TIF_MEMDIE) &&
(test_task_state(selected, TASK_UNINTERRUPTIBLE))) {
lowmem_print(2, "'%s' (%d) is already killed\n",
selected->comm,
selected->pid);
rcu_read_unlock();
mutex_unlock(&scan_mutex);
return 0;
}
task_lock(selected);
send_sig(SIGKILL, selected, 0);
/*