diff options
| -rw-r--r-- | Documentation/admin-guide/cgroup-v1/cgroups.rst | 2 | ||||
| -rw-r--r-- | Documentation/admin-guide/cgroup-v1/memory.rst | 26 |
2 files changed, 13 insertions, 15 deletions
diff --git a/Documentation/admin-guide/cgroup-v1/cgroups.rst b/Documentation/admin-guide/cgroup-v1/cgroups.rst index b0688011ed06..9343148ee993 100644 --- a/Documentation/admin-guide/cgroup-v1/cgroups.rst +++ b/Documentation/admin-guide/cgroup-v1/cgroups.rst @@ -80,6 +80,8 @@ access. For example, cpusets (see Documentation/admin-guide/cgroup-v1/cpusets.rs you to associate a set of CPUs and a set of memory nodes with the tasks in each cgroup. +.. _cgroups-why-needed: + 1.2 Why are cgroups needed ? ---------------------------- diff --git a/Documentation/admin-guide/cgroup-v1/memory.rst b/Documentation/admin-guide/cgroup-v1/memory.rst index 16d938abe69f..27d89495ac88 100644 --- a/Documentation/admin-guide/cgroup-v1/memory.rst +++ b/Documentation/admin-guide/cgroup-v1/memory.rst @@ -387,30 +387,30 @@ U != 0, K >= U: 3. User Interface ================= -3.0. Configuration ------------------- - -a. Enable CONFIG_CGROUPS -b. Enable CONFIG_MEMCG - -3.1. Prepare the cgroups (see cgroups.txt, Why are cgroups needed?) -------------------------------------------------------------------- +To use the user interface: -:: +1. Enable CONFIG_CGROUPS and CONFIG_MEMCG options +2. Prepare the cgroups (see :ref:`Why are cgroups needed? + <cgroups-why-needed>` for the background information):: # mount -t tmpfs none /sys/fs/cgroup # mkdir /sys/fs/cgroup/memory # mount -t cgroup none /sys/fs/cgroup/memory -o memory -3.2. Make the new group and move bash into it:: +3. Make the new group and move bash into it:: # mkdir /sys/fs/cgroup/memory/0 # echo $$ > /sys/fs/cgroup/memory/0/tasks -Since now we're in the 0 cgroup, we can alter the memory limit:: +4. Since now we're in the 0 cgroup, we can alter the memory limit:: # echo 4M > /sys/fs/cgroup/memory/0/memory.limit_in_bytes + The limit can now be queried:: + + # cat /sys/fs/cgroup/memory/0/memory.limit_in_bytes + 4194304 + .. note:: We can use a suffix (k, K, m, M, g or G) to indicate values in kilo, mega or gigabytes. (Here, Kilo, Mega, Giga are Kibibytes, Mebibytes, @@ -422,10 +422,6 @@ Since now we're in the 0 cgroup, we can alter the memory limit:: .. note:: We cannot set limits on the root cgroup any more. -:: - - # cat /sys/fs/cgroup/memory/0/memory.limit_in_bytes - 4194304 We can check the usage:: |