linux-kernel - Re: [RFC PATCH] memcg, oom: move out_of

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Date:   Thu, 21 Jun 2018 10:37:51 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     linux-mm@...ck.org, Greg Thelen <gthelen@...gle.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] memcg, oom: move out_of_memory back to the charge
 path

On Thu, Jun 21, 2018 at 10:09:27AM +0200, Michal Hocko wrote:
> @@ -496,14 +496,14 @@ void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
>  
>  static inline void mem_cgroup_oom_enable(void)
>  {
> -	WARN_ON(current->memcg_may_oom);
> -	current->memcg_may_oom = 1;
> +	WARN_ON(current->in_user_fault);
> +	current->in_user_fault = 1;
>  }
>  
>  static inline void mem_cgroup_oom_disable(void)
>  {
> -	WARN_ON(!current->memcg_may_oom);
> -	current->memcg_may_oom = 0;
> +	WARN_ON(!current->in_user_fault);
> +	current->in_user_fault = 0;
>  }

Would it make more sense to rename these to
mem_cgroup_enter_user_fault(), mem_cgroup_exit_user_fault()?

Other than that, this looks great to me.

Thanks