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cgroups.7: Add a section noting the "tasks" versus "processes" distinction 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2016-04-25 10:28:23 +02:00
parent 176a42118f
commit c775bca2c4
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@ -130,6 +130,23 @@ that are supported under version 2,
while also using version 1 controllers
where version 2 does not yet support those controllers.
.\"
.SS Tasks versus processes
In cgroups v1, a distinction is drawn between
.I processes
and
.IR tasks .
In this view, a process can consist of multiple tasks
(more commonly called threads, from a user-space perspective).
In cgroups v1, it is possible independently manipulate
the cgroup memberships of the tasks in a process.
Because this ability caused certain problems,
.\" FIXME Add some text describing why this was a problem.
the ability to independently manipulate the cgroup memberships
of the tasks in a process has been removed in cgroups v2.
Cgroups v2 allows manipulation of cgroup membership only for processes
(which has the effect of changing the cgroup membership of
all tasks in the process).
.\"
.SS Mounting
To be available, a given cgroup subsystem must be compiled into the
kernel.