cgroup: document cgroup_no_v1=
Add cgroup_no_v1= to kernel-parameters.txt, and a small blurb to cgroup-v2.txt section about transitioning from cgroup to cgroup2. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Tejun Heo <tj@kernel.org>
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@ -132,6 +132,12 @@ strongly discouraged for production use. It is recommended to decide
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the hierarchies and controller associations before starting using the
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controllers after system boot.
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During transition to v2, system management software might still
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automount the v1 cgroup filesystem and so hijack all controllers
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during boot, before manual intervention is possible. To make testing
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and experimenting easier, the kernel parameter cgroup_no_v1= allows
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disabling controllers in v1 and make them always available in v2.
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2-2. Organizing Processes
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@ -608,6 +608,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
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cut the overhead, others just disable the usage. So
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only cgroup_disable=memory is actually worthy}
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cgroup_no_v1= [KNL] Disable one, multiple, all cgroup controllers in v1
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Format: { controller[,controller...] | "all" }
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Like cgroup_disable, but only applies to cgroup v1;
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the blacklisted controllers remain available in cgroup2.
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cgroup.memory= [KNL] Pass options to the cgroup memory controller.
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Format: <string>
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nosocket -- Disable socket memory accounting.
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