1 ================== 2 Control Groupstats 3 ================== 4 5 Control Groupstats is inspired by the discussion at 6 https://lore.kernel.org/r/461CF883.2030308@sw.ru and implements per cgroup statistics as 7 suggested by Andrew Morton in https://lore.kernel.org/r/20070411114927.1277d7c9.akpm@linux-foundation.org. 8 9 Per cgroup statistics infrastructure re-uses code from the taskstats 10 interface. A new set of cgroup operations are registered with commands 11 and attributes specific to cgroups. It should be very easy to 12 extend per cgroup statistics, by adding members to the cgroupstats 13 structure. 14 15 The current model for cgroupstats is a pull, a push model (to post 16 statistics on interesting events), should be very easy to add. Currently 17 user space requests for statistics by passing the cgroup path. 18 Statistics about the state of all the tasks in the cgroup is returned to 19 user space. 20 21 NOTE: We currently rely on delay accounting for extracting information 22 about tasks blocked on I/O. If CONFIG_TASK_DELAY_ACCT is disabled, this 23 information will not be available. 24 25 To extract cgroup statistics a utility very similar to getdelays.c 26 has been developed, the sample output of the utility is shown below:: 27 28 ~/balbir/cgroupstats # ./getdelays -C "/sys/fs/cgroup/a" 29 sleeping 1, blocked 0, running 1, stopped 0, uninterruptible 0 30 ~/balbir/cgroupstats # ./getdelays -C "/sys/fs/cgroup" 31 sleeping 155, blocked 0, running 1, stopped 0, uninterruptible 2
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