On 07/12/2012 02:54 PM, Serge Hallyn wrote: > Quoting Kirill A. Shutemov ([email protected]): >> On Wed, Jul 11, 2012 at 03:24:22PM -0700, Andrew Morton wrote: >>> Am I reading that right? 1000 forks take 33 seconds, with basically >>> all of it just sitting there asleep? This look quite terrible - what >>> causes this? >> >> It seems free_nsproxy() + synchronize_rcu() are too heavy to be in >> exit_group() path. Patch below helps: 8s -> ~0.5s for me. > > And sys time goes down by that much too, or only user time? > > Given that, with user namespaces, it'll soon be possible for users who > are unprivileged toward the host to be able to create and destroy > namespaces, if the patch ends up making it easy for a user to consume a > bunch of system time and not have it accounted at all to himself, then > I think we should keep it as is.
Indeed. -- Doug Ledford <[email protected]> GPG KeyID: 0E572FDD http://people.redhat.com/dledford
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