Hello Li. On Wed, Oct 30, 2019 at 09:32:41AM +0000, "Li,Rongqing" <lirongqing@xxxxxxxxx> wrote: > I meet a issue, and not sure if it is normal It is a consequence of how cgroup state is retained. I considered a "trivial" fix, however, I learnt later it'd be a revert (and hence regression) of 3c606d35fe97 "cgroup: prevent mount hang due to memory controller lifetime" > Using the below script, the last line mount will fail after unmount > And it will fail until reboot system The cause is that controllers remained pinned to the same root. You can unpin them by mounting/unmounting again attached to the same root (i.e. cpu,cpuset again). (Perhaps the logic in cgroup1_root_to_use may be changed to cope better with the "stateless" controllers.) Michal
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