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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