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Date: Fri, 05 Sep 2008 11:43:52 +0800 From: Li Zefan <lizf@...fujitsu.com> To: Andrew Morton <akpm@...ux-foundation.org> CC: Paul Jackson <pj@....com>, Paul Menage <menage@...gle.com>, LKML <linux-kernel@...r.kernel.org> Subject: [PATCH] cpuset: hotplug documentation fix If all the cpus/mems in a cpuset are offlined, the tasks in it will be moved to the nearest ancestor with non-empty cpus/mems. Signed-off-by: Li Zefan <lizf@...fujitsu.com> --- Documentation/cpusets.txt | 18 ++++++++++-------- 1 files changed, 10 insertions(+), 8 deletions(-) diff --git a/Documentation/cpusets.txt b/Documentation/cpusets.txt index 1f5a924..871c1dd 100644 --- a/Documentation/cpusets.txt +++ b/Documentation/cpusets.txt @@ -635,14 +635,16 @@ prior 'mems' setting, will not be moved. There is an exception to the above. If hotplug functionality is used to remove all the CPUs that are currently assigned to a cpuset, -then the kernel will automatically update the cpus_allowed of all -tasks attached to CPUs in that cpuset to allow all CPUs. When memory -hotplug functionality for removing Memory Nodes is available, a -similar exception is expected to apply there as well. In general, -the kernel prefers to violate cpuset placement, over starving a task -that has had all its allowed CPUs or Memory Nodes taken offline. User -code should reconfigure cpusets to only refer to online CPUs and Memory -Nodes when using hotplug to add or remove such resources. +then all the tasks in that cpuset will be moved to the nearest ancestor +with non-empty cpus. But the moving of some (or all) tasks might fail if +cpuset is binded with another cgroup subsystem which has some restrictions +on task attaching. In this failing case, those tasks will stay +in the original cpuset, and the kernel will automatically update +their cpus_allowed to allow all online CPUs. When memory hotplug +functionality for removing Memory Nodes is available, a similar exception +is expected to apply there as well. In general, the kernel prefers to +violate cpuset placement, over starving a task that has had all +its allowed CPUs or Memory Nodes taken offline. There is a second exception to the above. GFP_ATOMIC requests are kernel internal allocations that must be satisfied, immediately. -- 1.5.4.rc3 -- 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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