> However, it appears that the same process, dTi-lm, is still chosen for oom
> kill
> because lowmem_deathpending_timeout has expired.
>
> So this looks like a problem if the constantly chosen process cannot exit.
> It would have been helpful to have the stack of pid 27289 in the log to see
> where it was stuck. But I think it may be unrelated to
> lowmem_deathpending_timeout itself. We'd be better off selecting a
> different process to kill with something like this:
>
> diff --git a/drivers/staging/android/lowmemorykiller.c
> b/drivers/staging/android/lowmemorykiller.c
> --- a/drivers/staging/android/lowmemorykiller.c
> +++ b/drivers/staging/android/lowmemorykiller.c
> @@ -128,11 +128,15 @@ static unsigned long lowmem_scan(struct shrinker
> *s, struct shrink_control *sc)
> if (!p)
> continue;
>
> - if (test_tsk_thread_flag(p, TIF_MEMDIE) &&
> - time_before_eq(jiffies, lowmem_deathpending_timeout)) {
> - task_unlock(p);
> - rcu_read_unlock();
> - return 0;
> + if (test_tsk_thread_flag(p, TIF_MEMDIE)) {
> + if (time_before_eq(jiffies,
> + lowmem_deathpending_timeout)) {
> + task_unlock(p);
> + rcu_read_unlock();
> + return 0;
> + }
> + /* Need to select a different process to kill */
> + continue;
> }
> oom_score_adj = p->signal->oom_score_adj;
> if (oom_score_adj < min_score_adj) {
>
> But we need more information. Please make sure that
> lowmem_debug_level is 1, try to get a complete kernel log, and if possible
> please try to capture the stack of the process that can't exit (use
> /proc/<pid>/stack) before trying the above patch.
Hi Rientjes:
I re-test the monkey stress test on your patches, it seems better than current
mainline code.
The kernel log is a little big, more than 10 MB. I send to you directly.
Best
tianfei
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