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

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Message-ID: <20150319101205.GC27066@moon>
Date:	Thu, 19 Mar 2015 13:12:05 +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 Wed, Mar 18, 2015 at 11:44:36PM +0300, Vladimir Davydov wrote:
> Knowing the portion of memory that is not used by a certain application
> or memory cgroup (idle memory) can be useful for partitioning the system
> efficiently. Currently, the only means to estimate the amount of idle
> memory provided by the kernel is /proc/PID/clear_refs. However, it has
> two serious shortcomings:
> 
>  - it does not count unmapped file pages
>  - it affects the reclaimer logic
> 
> This patch attempts to provide the userspace with the means to track
> idle memory without the above mentioned limitations.
...
> +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).
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