mirror of
https://github.com/torvalds/linux.git
synced 2024-11-08 21:21:47 +00:00
f6e07d3807
According to commit 676db4af04 ("cgroupfs: create /sys/fs/cgroup to
mount cgroupfs on") the canonical mountpoint for the cgroup filesystem
is /sys/fs/cgroup. Hence, this should be used in the documentation.
Signed-off-by: Jörg Sommer <joerg@alea.gnuu.de>
Acked-by: Paul Menage <menage@google.com>
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
28 lines
1.3 KiB
Plaintext
28 lines
1.3 KiB
Plaintext
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
|