mirror of https://gitee.com/openkylin/linux.git
32 lines
1.4 KiB
ReStructuredText
32 lines
1.4 KiB
ReStructuredText
|
==================
|
||
|
|
Control Groupstats
|
||
|
|
==================
|
||
|
|
|
||
|
|
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
|