• Tejun Heo's avatar
    cgroup_pids: don't account for the root cgroup · 67cde9c4
    Tejun Heo authored
    Because accounting resources for the root cgroup sometimes incurs
    measureable overhead for workloads which don't care about cgroup and
    often ends up calculating a number which is available elsewhere in a
    slightly different form, cgroup is not in the business of providing
    system-wide statistics.  The pids controller which was introduced
    recently was exposing "pids.current" at the root.  This patch disable
    accounting for root cgroup and removes the file from the root
    directory.
    
    While this is a userland visible behavior change, pids has been
    available only in one version and was badly broken there, so I don't
    think this will be noticeable.  If it turns out to be a problem, we
    can reinstate it for v1 hierarchies.
    Signed-off-by: default avatarTejun Heo <tj@kernel.org>
    Cc: Aleksa Sarai <cyphar@cyphar.com>
    67cde9c4
cgroup_pids.c 8.06 KB