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cgroup_namespaces.7: Some wording fixes to improve clarity 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2019-05-20 21:34:50 +02:00
parent c9d68a690b
commit 727e560920
1 changed files with 13 additions and 10 deletions
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23
man7/cgroup_namespaces.7
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@ -54,7 +54,7 @@ of the new namespace.
(This applies both for the cgroups version 1 hierarchies
and the cgroups version 2 unified hierarchy.)
.PP
When viewing
When reading the cgroup memberships of a "target" process from
.IR /proc/[pid]/cgroup ,
the pathname shown in the third field of each record will be
relative to the reading process's root directory
@ -68,7 +68,8 @@ entries for each ancestor level in the cgroup hierarchy.
The following shell session demonstrates the effect of creating
a new cgroup namespace.
.PP
First, (as superuser) we create a child cgroup in the
First, (as superuser) in a shell in the initial cgroup namespace,
we create a child cgroup in the
.I freezer
hierarchy, and place a process in that cgroup that we will
use as part of the demonstration below:
@ -107,11 +108,12 @@ to create a process running a new shell in new cgroup and mount namespaces:
.in
.EE
.PP
We then inspect the
From the new shell started by
.BR unshare (1),
we then inspect the
.IR /proc/[pid]/cgroup
files of, respectively, the new shell process started by the
.BR unshare (1)
command, a process that is in the initial cgroup namespace
files of, respectively, the new shell,
a process that is in the initial cgroup namespace
.RI ( init ,
with PID 1), and the process in the sibling cgroup
.RI ( sub2 ):
@ -160,11 +162,12 @@ Since by the definition of cgroup namespaces, the process's current
freezer cgroup directory became its root freezer cgroup directory,
we should see \(aq/\(aq in this field.
The problem here is that we are seeing a mount entry for the cgroup
filesystem corresponding to our initial shell process's cgroup namespace
(whose cgroup filesystem is indeed rooted in the parent directory of
filesystem corresponding to the initial cgroup namespace
(whose cgroup filesystem is indeed rooted at the parent directory of
.IR sub ).
We need to remount the freezer cgroup filesystem
inside this cgroup namespace, after which we see the expected results:
To fix this problem, we must remount the freezer cgroup filesystem
from the new shell (i.e., perform the mount from a process that is in the
new cgroup namespace), after which we see the expected results:
.PP
.EX
.in +4n