On Mon, Oct 16, 2017 at 01:52:16PM -0500, Leon Yang wrote: > From: Leon Yang <leon.gh.yang@xxxxxxxxx> > > Each time the unmounted list is cleanup, synchronize_rcu() is > called, which is relatively costly. Scheduling the cleanup in a > workqueue, similar to what is being done in > net/core/net_namespace.c:cleanup_net, makes unmounting faster > without adding too much overhead. This is useful especially for > servers with many containers where mounting/unmounting happens a > lot. NAK. You really do _not_ want to return from umount(2) too early.
