Hi Michal, On 2021/1/14 21:12, Michal Koutný wrote: > Hello Chen. > > On Fri, Dec 18, 2020 at 02:17:55PM +0800, Chen Zhou <chenzhou10@xxxxxxxxxx> wrote: >> When mounting a cgroup hierarchy with disabled controller in cgroup v1, >> all available controllers will be attached. > Not sure if I understand the situation -- have you observed a v1 > controller attached to a hierarchy while specifying cgroup_no_v1= kernel > cmdline arg? Yeah, this is the situation. In this case, at the beginning of function check_cgroupfs_options(), the mask ctx->subsys_mask will be 0. And if we mount without 'none' and 'name=' options, then in check_cgroupfs_options(), the flag ctx->all_ss will be set, that is, select all the subsystems. Thanks, Chen Zhou > > AFAICS, the disabled controllers are honored thanks to > check_cgroupfs_options(). > > Michal
