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SubjectRe: [PATCH 2/2] mm: replace TIF_MEMDIE checks by tsk_is_oom_victim
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Michal Hocko wrote:
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 544d47e5cbbd..86a48affb938 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -1896,7 +1896,7 @@ static int try_charge(struct mem_cgroup *memcg, gfp_t gfp_mask,
> * bypass the last charges so that they can exit quickly and
> * free their memory.
> */
> - if (unlikely(test_thread_flag(TIF_MEMDIE) ||
> + if (unlikely(tsk_is_oom_victim(current) ||
> fatal_signal_pending(current) ||
> current->flags & PF_EXITING))
> goto force;

Did we check http://lkml.kernel.org/r/20160909140508.GO4844@dhcp22.suse.cz ?

> diff --git a/mm/oom_kill.c b/mm/oom_kill.c
> index c9f3569a76c7..65cc2f9aaa05 100644
> --- a/mm/oom_kill.c
> +++ b/mm/oom_kill.c
> @@ -483,7 +483,7 @@ static bool __oom_reap_task_mm(struct task_struct *tsk, struct mm_struct *mm)
> * [...]
> * out_of_memory
> * select_bad_process
> - * # no TIF_MEMDIE task selects new victim
> + * # no TIF_MEMDIE, selects new victim
> * unmap_page_range # frees some memory
> */
> mutex_lock(&oom_lock);

This comment is wrong. No MMF_OOM_SKIP mm selects new victim.

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