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    Subject[PATCH 1/4] hotplug cpu move tasks in empty cpusets to parent node_online_map fix
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    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@sgi.com>
    Acked-by: Cliff Wickman <cpw@sgi.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
    @@ -1801,7 +1801,8 @@ 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 */
    @@ -1816,8 +1817,8 @@ 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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