On Sat, Nov 12, 2022 at 05:19:39PM -0500, Waiman Long <longman@xxxxxxxxxx> wrote:
> + /*
> + * In the default hierarchy, enabling cpuset in the child cgroups
> + * will trigger a number of cpuset_attach() calls with no change
> + * in effective cpus and mems. In that case, we can optimize out
> + * by skipping the task iteration and update.
> + */
> + if (cgroup_subsys_on_dfl(cpuset_cgrp_subsys) &&
> + !cpus_updated && !mems_updated) {
I'm just wondering -- why is this limited to the default hierarchy only?
IOW why can't v1 skip too (when favorable constness between cpusets).
Thanks,
Michal
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