On Sun, Oct 24, 2021 at 11:19:16PM -0700, Shakeel Butt wrote: > On the real systems, the cgroups hierarchies are setup early and just > once by the node controller, so, other than number of cgroups, all > information in /proc/cgroups remain same for the system uptime. Let's > remove the cgroup_mutex usage on reading /proc/cgroups. There is a > chance of inconsistent number of cgroups for co-mounted cgroups while > printing the information from /proc/cgroups but that is not a big > issue. In addition /proc/cgroups is a v1 specific interface, so the > dependency on it should reduce over time. > > The main motivation for removing the cgroup_mutex from /proc/cgroups is > to reduce the avenues of its contention. On our fleet, we have observed > buggy application hammering on /proc/cgroups and drastically slowing > down the node controller on the system which have many negative > consequences on other workloads running on the system. > > Signed-off-by: Shakeel Butt <shakeelb@xxxxxxxxxx> Applied 1-3 to cgroup/for-5.16. Thanks. -- tejun
