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[NO NEW TESTS NEEDED] This is just moving pkg/cgroups out so
existing tests should be fine.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
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This fixes the behavior to return nil for the PIDs cgroup if the
container path is empty.
Signed-off-by: Sascha Grunert <sgrunert@suse.com>
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If the ctr.path is empty, then we do not try to access
`/sys/fs/cgroup/pids/pids.current` any more because this path will be
wrong in any case. We now return and do not set the PIDs stats.
Refers to https://github.com/cri-o/cri-o/issues/3522
Signed-off-by: Sascha Grunert <sgrunert@suse.com>
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if the cgroup cannot be deleted, then attempt to delete all its
subdirectories and try again.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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drop the limitation of not supporting creating new cgroups v2 paths.
Every controller enabled /sys/fs/cgroup will be propagated down to the
created path. This won't work for rootless cgroupsv2, but it is not
an issue for now, as this code is used only by CRI-O.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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This is an initial implementation of cgroup v2 support for
pkg/cgroups. It currently works with crun, with this patch:
https://github.com/giuseppe/crun/pull/49).
It adds the pieces for:
- set PID limit to 1
- retrieve stats so that "podman stats" work.
the only missing part is the support for reading per
CPU stats (that is cpuacct.usage_percpu on cgroup v1), so for now it
always returns an empty result.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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use the new implementation for dealing with cgroups.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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provide a package for managing cgroups. This is not supposed to be a
complete implementation with all the features supported by cgroups,
but it is a minimal implementation designed around what libpod needs
and it is currently using.
For example, it is currently possible to Apply only the pids limit,
as it is used by libpod for stopping containers, any other Apply will
just fail.
The main goal here is to have a minimal library where we have full
control, so we can start playing with cgroup v2.
When the need arises, we can add more features.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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