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Date: Sun, 13 Jan 2008 22:41:41 -0800 From: Paul Jackson <pj@....com> To: Andrew Morton <akpm@...l.org> Cc: Lee.Schermerhorn@...com, Cliff Wickman <cpw@....com>, linux-kernel@...r.kernel.org, David Rientjes <rientjes@...gle.com>, Christoph Lameter <clameter@....com>, Paul Jackson <pj@....com> Subject: [PATCH 1/3] hotplug cpu move tasks in empty cpusets to parent node_online_map fix From: Paul Jackson <pj@....com> 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> Cc: Cliff Wickman <cpw@....com> --- kernel/cpuset.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) --- 2.6.24-rc6-mm1.orig/kernel/cpuset.c 2008-01-12 18:52:43.480406969 -0800 +++ 2.6.24-rc6-mm1/kernel/cpuset.c 2008-01-12 19:07:44.330236260 -0800 @@ -1817,7 +1817,8 @@ 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 */ @@ -1832,8 +1833,8 @@ 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 -- I won't rest till it's the best ... Programmer, Linux Scalability Paul Jackson <pj@....com> 1.650.933.1373 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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