Commit | Line | Data |
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c3123552 MCC |
1 | ================== |
2 | Control Groupstats | |
3 | ================== | |
4 | ||
846c7bb0 | 5 | Control Groupstats is inspired by the discussion at |
05a5f51c JP |
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. | |
846c7bb0 BS |
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 | |
c3123552 | 26 | has been developed, the sample output of the utility is shown below:: |
846c7bb0 | 27 | |
c3123552 MCC |
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 |