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

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Date:	Thu, 19 Mar 2015 13:45:24 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Vladimir Davydov <vdavydov@...allels.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 01:41:03PM +0300, Vladimir Davydov wrote:
> > 
> > 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.

OK, thanks for info!
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