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cgroups.7: Substantial reworking of text on v1 cgroup release notification 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2016-10-07 16:33:08 +02:00
parent 88afe701da
commit 23388d411f
1 changed files with 36 additions and 8 deletions
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44
man7/cgroups.7
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@ -403,16 +403,44 @@ Note that files in a cgroup directory cannot and need not be
removed.
.\"
.SS Cgroups v1 release notification
A special file in each cgroup hierarchy,
Two files can be used to determine whether the kernel provides
notifications when a cgroup becomes empty.
A cgroup is considered to be empty when it contains no child
cgroups and no member processes.
A special file in the root directory of each cgroup hierarchy,
.IR release_agent ,
can be used to register a program to handle cgroups which become newly empty.
The program will be called each time a cgroup marked for
autoremove becomes empty and childless.
The cgroup path will be provided as the first command-line argument.
The cgroup must be marked as eligible for autoremove by writing '1' into its
can be used to register the pathname of a program that may be invoked when
a cgroup in the hierarchy becomes empty.
The pathname of the newly empty cgroup (relative to the cgroup mount point)
is provided as the sole command-line argument when the
.IR release_agent
program is invoked.
The
.IR release_agent
program might remove the cgroup directory,
or perhaps repopulate with a process.
The default value of the
.IR release_agent
file is empty, meaning that no release agent is invoked.
Whether or not the
.IR release_agent
program is invoked when a particular cgroup becomes empty is determined
by the value in the
.IR notify_on_release
file;
this value is inherited by newly created child cgroups.
file in the corresponding cgroup directory.
If this file contains the value 0, then the
.IR release_agent
program is not invoked.
If it contains the value 1, the
.IR release_agent
program is invoked.
The default value for this file in the root cgroup is 0.
At the time when a new cgroup is created,
the value in this file is inherited from the corresponding file
in the parent cgroup.
.\"
.SS Cgroups version 2
In cgroups v2,