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- 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 "/sys/fs/cgroup/a"
- sleeping 1, blocked 0, running 1, stopped 0, uninterruptible 0
- ~/balbir/cgroupstats # ./getdelays -C "/sys/fs/cgroup"
- sleeping 155, blocked 0, running 1, stopped 0, uninterruptible 2
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