diff options
Diffstat (limited to 'Documentation/cgroups')
| -rw-r--r-- | Documentation/cgroups/blkio-controller.txt | 27 | ||||
| -rw-r--r-- | Documentation/cgroups/cgroup_event_listener.c | 2 | ||||
| -rw-r--r-- | Documentation/cgroups/cgroups.txt | 8 | ||||
| -rw-r--r-- | Documentation/cgroups/memcg_test.txt | 2 |
4 files changed, 33 insertions, 6 deletions
diff --git a/Documentation/cgroups/blkio-controller.txt b/Documentation/cgroups/blkio-controller.txt index d6da611f8f6..4ed7b5ceeed 100644 --- a/Documentation/cgroups/blkio-controller.txt +++ b/Documentation/cgroups/blkio-controller.txt @@ -89,6 +89,33 @@ Throttling/Upper Limit policy Limits for writes can be put using blkio.write_bps_device file. +Hierarchical Cgroups +==================== +- Currently none of the IO control policy supports hierarhical groups. But + cgroup interface does allow creation of hierarhical cgroups and internally + IO policies treat them as flat hierarchy. + + So this patch will allow creation of cgroup hierarhcy but at the backend + everything will be treated as flat. So if somebody created a hierarchy like + as follows. + + root + / \ + test1 test2 + | + test3 + + CFQ and throttling will practically treat all groups at same level. + + pivot + / | \ \ + root test1 test2 test3 + + Down the line we can implement hierarchical accounting/control support + and also introduce a new cgroup file "use_hierarchy" which will control + whether cgroup hierarchy is viewed as flat or hierarchical by the policy.. + This is how memory controller also has implemented the things. + Various user visible config options =================================== CONFIG_BLK_CGROUP diff --git a/Documentation/cgroups/cgroup_event_listener.c b/Documentation/cgroups/cgroup_event_listener.c index 8c2bfc4a635..3e082f96dc1 100644 --- a/Documentation/cgroups/cgroup_event_listener.c +++ b/Documentation/cgroups/cgroup_event_listener.c @@ -91,7 +91,7 @@ int main(int argc, char **argv) if (ret == -1) { perror("cgroup.event_control " - "is not accessable any more"); + "is not accessible any more"); break; } diff --git a/Documentation/cgroups/cgroups.txt b/Documentation/cgroups/cgroups.txt index 190018b0c64..44b8b7af801 100644 --- a/Documentation/cgroups/cgroups.txt +++ b/Documentation/cgroups/cgroups.txt @@ -355,13 +355,13 @@ subsystems, type: To change the set of subsystems bound to a mounted hierarchy, just remount with different options: -# mount -o remount,cpuset,ns hier1 /dev/cgroup +# mount -o remount,cpuset,blkio hier1 /dev/cgroup -Now memory is removed from the hierarchy and ns is added. +Now memory is removed from the hierarchy and blkio is added. -Note this will add ns to the hierarchy but won't remove memory or +Note this will add blkio to the hierarchy but won't remove memory or cpuset, because the new options are appended to the old ones: -# mount -o remount,ns /dev/cgroup +# mount -o remount,blkio /dev/cgroup To Specify a hierarchy's release_agent: # mount -t cgroup -o cpuset,release_agent="/sbin/cpuset_release_agent" \ diff --git a/Documentation/cgroups/memcg_test.txt b/Documentation/cgroups/memcg_test.txt index b7eececfb19..fc8fa97a09a 100644 --- a/Documentation/cgroups/memcg_test.txt +++ b/Documentation/cgroups/memcg_test.txt @@ -398,7 +398,7 @@ Under below explanation, we assume CONFIG_MEM_RES_CTRL_SWAP=y. written to move_charge_at_immigrate. 9.10 Memory thresholds - Memory controler implements memory thresholds using cgroups notification + Memory controller implements memory thresholds using cgroups notification API. You can use Documentation/cgroups/cgroup_event_listener.c to test it. |