linux-kernel - Re: (resend) [PATCH] vmscan,memcg: memcg aware swap token

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Date:	Wed, 27 Apr 2011 10:19:41 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	kosaki.motohiro@...fujitsu.com,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Nishimura Daisuke <d-nishimura@....biglobe.ne.jp>
Subject: Re: (resend) [PATCH] vmscan,memcg: memcg aware swap token

> On Tue, 26 Apr 2011 16:59:19 +0900 (JST)
> KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:
> 
> > @@ -75,3 +76,19 @@ void __put_swap_token(struct mm_struct *mm)
> >  		swap_token_mm = NULL;
> >  	spin_unlock(&swap_token_lock);
> >  }
> > +
> > +int has_swap_token_memcg(struct mm_struct *mm, struct mem_cgroup *memcg)
> > +{
> > +	if (memcg) {
> > +		struct mem_cgroup *swap_token_memcg;
> > +
> > +		/*
> > +		 * memcgroup reclaim can disable swap token only if token task
> > +		 * is in the same cgroup.
> > +		 */
> > +		swap_token_memcg = try_get_mem_cgroup_from_mm(swap_token_mm);
> > +		return ((mm == swap_token_mm) && (memcg == swap_token_memcg));
> > +	} else
> > +		return (mm == swap_token_mm);
> > +}
> 
> Seems to be missing a css_put()?

Yes! Please drop this one. I'll rework it at this weekend.

Thank you for the finding!

> 
> Either I'm mistaken or that's a bug.  Perhaps neither of these would
> have happened if we'd bothered to document
> try_get_mem_cgroup_from_mm().
> 



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