Subversion Repositories test_project

Control Groupstats is inspired by the discussion at

http://lkml.org/lkml/2007/4/11/187 and implements per cgroup statistics as

suggested by Andrew Morton in http://lkml.org/lkml/2007/4/11/263.

Per cgroup statistics infrastructure re-uses code from the taskstats

interface. A new set of cgroup operations are registered with commands

and attributes specific to cgroups. It should be very easy to

extend per cgroup statistics, by adding members to the cgroupstats

structure.

The current model for cgroupstats is a pull, a push model (to post

statistics on interesting events), should be very easy to add. Currently

user space requests for statistics by passing the cgroup path.

Statistics about the state of all the tasks in the cgroup is returned to

user space.

NOTE: We currently rely on delay accounting for extracting information

about tasks blocked on I/O. If CONFIG_TASK_DELAY_ACCT is disabled, this

information will not be available.

To extract cgroup statistics a utility very similar to getdelays.c

has been developed, the sample output of the utility is shown below

~/balbir/cgroupstats # ./getdelays  -C "/cgroup/a"

sleeping 1, blocked 0, running 1, stopped 0, uninterruptible 0

~/balbir/cgroupstats # ./getdelays  -C "/cgroup"

sleeping 155, blocked 0, running 1, stopped 0, uninterruptible 2