linux-kernel - Re: [PATCH] memcg: deprecate memory.force

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Message-ID: <20140512152015.GH9564@dhcp22.suse.cz>
Date:	Mon, 12 May 2014 17:20:15 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Tejun Heo <tj@...nel.org>
Cc:	lizefan@...wei.com, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org, hannes@...xchg.org
Subject: Re: [PATCH] memcg: deprecate memory.force_empty knob

On Mon 12-05-14 11:00:14, Tejun Heo wrote:
> On Mon, May 12, 2014 at 04:58:03PM +0200, Michal Hocko wrote:
> > @@ -4793,6 +4793,10 @@ static int mem_cgroup_force_empty_write(struct cgroup_subsys_state *css,
> >  
> >  	if (mem_cgroup_is_root(memcg))
> >  		return -EINVAL;
> > +	pr_info("%s (%d): memory.force_empty is deprecated and will be removed.",
> > +			current->comm, task_pid_nr(current));
> > +	pr_cont(" Let us know if you know if it needed in your usecase at");
> > +	pr_cont(" linux-mm@...ck.org\n");
> >  	return mem_cgroup_force_empty(memcg);
> 
> It probably would be way easier to just mark the knob with
> CFTYPE_INSANE.

That would prevent from creating the file, right? I do not mind that but
I would like to see people complaining before.

-- 
Michal Hocko
SUSE Labs
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