From 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 12:05:51 +0200 Subject: Adding upstream version 5.10.209. Signed-off-by: Daniel Baumann --- Documentation/accounting/cgroupstats.rst | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 Documentation/accounting/cgroupstats.rst (limited to 'Documentation/accounting/cgroupstats.rst') diff --git a/Documentation/accounting/cgroupstats.rst b/Documentation/accounting/cgroupstats.rst new file mode 100644 index 000000000..b9afc48f4 --- /dev/null +++ b/Documentation/accounting/cgroupstats.rst @@ -0,0 +1,31 @@ +================== +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 -- cgit v1.2.3