linux-kernel - [PATCH] Documentation: cgroups: Add notes on removing PIDs from tasks and cgroups requiring setup

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Message-Id: <1299704969-4485-1-git-send-email-emunson@mgebm.net>
Date:	Wed,  9 Mar 2011 16:09:29 -0500
From:	Eric B Munson <emunson@...bm.net>
To:	containers@...ts.linux-foundation.org
Cc:	rdunlap@...otime.net, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, Eric B Munson <emunson@...bm.net>
Subject: [PATCH] Documentation: cgroups: Add notes on removing PIDs from tasks and cgroups requiring setup

The cgroup documentation does not specify how a process can be removed from a
particular group.  This patch adds a note at the end of the simple example
about how this is done.  Also, some cgroups (like cpusets) require user input
before a new group can be used.  This is noted in the patch as well.

Signed-off-by: Eric B Munson <emunson@...bm.net>
---
 Documentation/cgroups/cgroups.txt |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/Documentation/cgroups/cgroups.txt b/Documentation/cgroups/cgroups.txt
index 44b8b7a..6c975a1 100644
--- a/Documentation/cgroups/cgroups.txt
+++ b/Documentation/cgroups/cgroups.txt
@@ -349,6 +349,10 @@ To mount a cgroup hierarchy with all available subsystems, type:
 The "xxx" is not interpreted by the cgroup code, but will appear in
 /proc/mounts so may be any useful identifying string that you like.
 
+Note: Some subsystems do not work without some user input first.  For instance,
+if cpusets are enabled the user will have to populate the cpus and mems files
+for each new cgroup created before that group can be used.
+
 To mount a cgroup hierarchy with just the cpuset and memory
 subsystems, type:
 # mount -t cgroup -o cpuset,memory hier1 /dev/cgroup
@@ -426,6 +430,9 @@ You can attach the current shell task by echoing 0:
 
 # echo 0 > tasks
 
+Note: To remove a task from a cgroup you must write its PID to the root
+tasks file.
+
 2.3 Mounting hierarchies by name
 --------------------------------
 
-- 
1.7.1

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