linux-kernel - [PATCH 1/4 v2] hotplug cpu move tasks in empty cpusets to parent node_online

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Message-Id: <20080204174046.91FA31FE109@attica.americas.sgi.com>
Date:	Mon, 04 Feb 2008 11:40:46 -0600
From:	cpw@....com (Cliff Wickman)
To:	linux-kernel@...r.kernel.org
Cc:	pj@....com, clameter@....com, rientjes@...gle.com,
	linux-kernel@...r.kernel.org, Lee.Schermerhorn@...com,
	akpm@...l.org
Subject: [PATCH 1/4 v2] hotplug cpu move tasks in empty cpusets to parent
 node_online_map fix


As of the October 2007 kernel/cpuset.c patch "Memoryless nodes:
Use N_HIGH_MEMORY for cpusets", cpuset nodes are relative to
the nodes with (HIGH) memory, not relative to all nodes in
node_online_map.

Signed-off-by: Paul Jackson <pj@....com>
Acked-by: Cliff Wickman <cpw@....com>

---

 kernel/cpuset.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

Index: linux-2.6/kernel/cpuset.c
===================================================================
--- linux-2.6.orig/kernel/cpuset.c
+++ linux-2.6/kernel/cpuset.c
@@ -1762,7 +1762,8 @@ static void scan_for_empty_cpusets(const
 		cont = cp->css.cgroup;
 		/* Remove offline cpus and mems from this cpuset. */
 		cpus_and(cp->cpus_allowed, cp->cpus_allowed, cpu_online_map);
-		nodes_and(cp->mems_allowed, cp->mems_allowed, node_online_map);
+		nodes_and(cp->mems_allowed, cp->mems_allowed,
+						node_states[N_HIGH_MEMORY]);
 		if ((cpus_empty(cp->cpus_allowed) ||
 		     nodes_empty(cp->mems_allowed))) {
 			/* Move tasks from the empty cpuset to a parent */
@@ -1777,8 +1778,8 @@ static void scan_for_empty_cpusets(const
 
 /*
  * The cpus_allowed and mems_allowed nodemasks in the top_cpuset track
- * cpu_online_map and node_online_map.  Force the top cpuset to track
- * whats online after any CPU or memory node hotplug or unplug event.
+ * cpu_online_map and node_states[N_HIGH_MEMORY].  Force the top cpuset to
+ * track what's online after any CPU or memory node hotplug or unplug event.
  *
  * Since there are two callers of this routine, one for CPU hotplug
  * events and one for memory node hotplug events, we could have coded
--
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