linux-kernel - Re: [PATCH 3/3] mm: idle memory tracking

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Message-ID: <20150319104103.GA12162@esperanza>
Date:	Thu, 19 Mar 2015 13:41:03 +0300
From:	Vladimir Davydov <vdavydov@...allels.com>
To:	Cyrill Gorcunov <gorcunov@...il.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Greg Thelen <gthelen@...gle.com>,
	Michel Lespinasse <walken@...gle.com>,
	David Rientjes <rientjes@...gle.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Jonathan Corbet <corbet@....net>, <linux-api@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] mm: idle memory tracking

On Thu, Mar 19, 2015 at 01:12:05PM +0300, Cyrill Gorcunov wrote:
> On Wed, Mar 18, 2015 at 11:44:36PM +0300, Vladimir Davydov wrote:
> > +static void set_mem_idle(void)
> > +{
> > +	int nid;
> > +
> > +	for_each_online_node(nid)
> > +		set_mem_idle_node(nid);
> > +}
> 
> Vladimir, might we need get_online_mems/put_online_mems here,
> or if node gets offline this wont be a problem? (Asking
> because i don't know).

I only need to dereference page structs corresponding to the node here,
and page structs are not freed when the node gets offline AFAICS, so I
guess it must be safe.

Thanks,
Vladimir
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