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docs, cgroup: add entries for pids to cgroup-v2.rst

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This patch add two entries (pids.peak and pids.events) for pids
controller, and also update pids.current because it's on non-root.

Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
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Xiu Jianfeng 2024-04-18 12:30:12 +00:00 committed by Tejun Heo
parent 15a0b5fe1a
commit c9169291be
1 changed files with 15 additions and 1 deletions
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Documentation/admin-guide/cgroup-v2.rst
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@ -2184,11 +2184,25 @@ PID Interface Files
Hard limit of number of processes. Hard limit of number of processes.
pids.current pids.current
A read-only single value file which exists on all cgroups. A read-only single value file which exists on non-root cgroups.
The number of processes currently in the cgroup and its The number of processes currently in the cgroup and its
descendants. descendants.
pids.peak
A read-only single value file which exists on non-root cgroups.
The maximum value that the number of processes in the cgroup and its
descendants has ever reached.
pids.events
A read-only flat-keyed file which exists on non-root cgroups. The
following entries are defined. Unless specified otherwise, a value
change in this file generates a file modified event.
max
Number of times fork failed because limit was hit.
Organisational operations are not blocked by cgroup policies, so it is Organisational operations are not blocked by cgroup policies, so it is
possible to have pids.current > pids.max. This can be done by either possible to have pids.current > pids.max. This can be done by either
setting the limit to be smaller than pids.current, or attaching enough setting the limit to be smaller than pids.current, or attaching enough