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cgroups.7: Document /proc/cgroups 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2016-04-28 09:22:52 +02:00
parent 5f8a7eb2d1
commit 34eb33407f
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man7/cgroups.7
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@ -453,6 +453,48 @@ Further information can be found in the kernel source file
.IR Documentation/cgroup-v1/pids.txt .
.SS /proc files
.TP
.IR /proc/cgroups " (since Linux 2.6.24)"
This file contains information about the cgroups version 1 controllers
that are available on the system.
An example of the contents of this file (reformatted for readability)
is the following:
.nf
.in +4n
#subsys_name hierarchy num_cgroups enabled
cpuset 4 1 1
cpu 8 1 1
cpuacct 8 1 1
blkio 6 1 1
memory 3 1 1
devices 10 84 1
freezer 7 1 1
net_cls 9 1 1
perf_event 5 1 1
net_prio 9 1 1
hugetlb 0 1 0
pids 2 1 1
.in
.fi
The fields in this file are, from left to right:
.RS
.IP 1. 3
The name of the controller.
.IP 2.
A unique ID for the cgroup hierarchy on which this controller is mounted.
If the controller is not currently mounted, the value in this field is 0.
If multiple controllers are bound to the same hierarchy,
then each will show the same hierarchy ID in this field.
.IP 3.
The number of control groups in this hierarchy using this controller.
.IP 4.
This field contains the value 1 if this controller is enabled,
or 0 if it has been disabled (via the
.IR cgroup_disable
kernel command-line boot parameter).
.RE
.TP
.IR /proc/[pid]/cgroup " (since Linux 2.6.24)"
This file describes control groups to which the process belongs.
The displayed information differs for