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| author | Michael Kerrisk <mtk.manpages@gmail.com> | 2016-10-07 17:02:32 +0200 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2016-10-08 14:08:23 +0200 |
| commit | 2befa495c2bce914316569f05e1f083141d90f55 (patch) | |
| tree | d2814505f36fb6a4e1c2ac97924add0b6fa1e58c /man7/cgroups.7 | |
| parent | 5b38b21d2d6be6e2796cb875ce952bf49872050f (diff) | |
| download | man-pages-2befa495c2bce914316569f05e1f083141d90f55.tar.gz | |
cgroups.7: Restructure list of cgroup v2 differences
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Diffstat (limited to 'man7/cgroups.7')
| -rw-r--r-- | man7/cgroups.7 | 58 |
1 files changed, 34 insertions, 24 deletions
diff --git a/man7/cgroups.7 b/man7/cgroups.7 index c6eac85247..7d6be88dc3 100644 --- a/man7/cgroups.7 +++ b/man7/cgroups.7 @@ -450,10 +450,38 @@ mounted under the v1 and v2 hierarchies, it is not possible to mount the same controller simultaneously under both the v1 and the v2 hierarchies. -The new behaviors in cgroups v2 are summarized below: -.TP 3 -1. Processes only in leaf nodes -With the exception of the root cgroup, processes may reside only in leaf nodes. +The new behaviors in cgroups v2 are summarized here, +and in some cases elaborated in the following subsections. +.IP 1. 3 +"Internal" processes are not permitted. +With the exception of the root cgroup, processes may reside +only in leaf nodes (cgroups that do not themselves contain child cgroups). +.IP 2. +Active cgroups must be specified via the files +.IR cgroup.controllers +and +.IR cgroup.subtree_control . +.IP 3. +The +.I tasks +file has been removed. +In addition, the +.I cgroup.clone_children +file that is employed by the +.I cpuset +controller has been removed. +.IP 4. +An improved mechanism for notification of empty cgroups is provided by the +.IR cgroup.events +file. +.PP +For more changes, see the +.I Documentation/cgroup-v2.txt +file in the kernel source. +.\" +.SS Cgroups v2 "no internal processes" rule +With the exception of the root cgroup, processes may reside +only in leaf nodes (cgroups that do not themselves contain child cgroups). This avoids the need to decide how to partition resources between processes which are members of cgroup A and processes in child cgroups of A. @@ -480,12 +508,8 @@ the relationship between processes in and .IR /cg1 's other children. -.TP -2. Active cgroups must be specified -The unified hierarchy presents two new files, -.IR cgroup.controllers -and -.IR cgroup.subtree_control . +.\" +.SS Cgroups v2 subtree control When a cgroup .I A/b is created, its @@ -502,20 +526,6 @@ controller is not enabled in .IR /A/B , then it cannot be enabled in .IR /A/B/C . -.TP -3. No "tasks" or "cgroup.clone_children" files -.TP -4. Empty cgroup notification -A new file, -.IR cgroup.populated , -under each cgroup contains '0' when the -cgroup is empty, and 1 when it is populated. -It therefore may be watched to detect when a cgroup becomes (non-)empty. -This replaces the original notify-on-release mechanism. -.PP -For more changes, see the -.I Documentation/cgroup-v2.txt -file in the kernel source. .\" .SS Cgroups v2 events file A new feature in cgroups v2 is the |