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846c7bb0 BS |
1 | Control Groupstats is inspired by the discussion at |
2 | http://lkml.org/lkml/2007/4/11/187 and implements per cgroup statistics as | |
3 | suggested by Andrew Morton in http://lkml.org/lkml/2007/4/11/263. | |
4 | ||
5 | Per cgroup statistics infrastructure re-uses code from the taskstats | |
6 | interface. A new set of cgroup operations are registered with commands | |
7 | and attributes specific to cgroups. It should be very easy to | |
8 | extend per cgroup statistics, by adding members to the cgroupstats | |
9 | structure. | |
10 | ||
11 | The current model for cgroupstats is a pull, a push model (to post | |
12 | statistics on interesting events), should be very easy to add. Currently | |
13 | user space requests for statistics by passing the cgroup path. | |
14 | Statistics about the state of all the tasks in the cgroup is returned to | |
15 | user space. | |
16 | ||
17 | NOTE: We currently rely on delay accounting for extracting information | |
18 | about tasks blocked on I/O. If CONFIG_TASK_DELAY_ACCT is disabled, this | |
19 | information will not be available. | |
20 | ||
21 | To extract cgroup statistics a utility very similar to getdelays.c | |
22 | has been developed, the sample output of the utility is shown below | |
23 | ||
24 | ~/balbir/cgroupstats # ./getdelays -C "/cgroup/a" | |
25 | sleeping 1, blocked 0, running 1, stopped 0, uninterruptible 0 | |
26 | ~/balbir/cgroupstats # ./getdelays -C "/cgroup" | |
27 | sleeping 155, blocked 0, running 1, stopped 0, uninterruptible 2 |