Messages in this thread | | | Date | Tue, 26 Jun 2012 11:06:20 -0700 | From | "Paul E. McKenney" <> | Subject | Re: Attaching a process to cgroups |
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On Thu, Jun 21, 2012 at 10:23:02AM +0200, Mike Galbraith wrote: > On Thu, 2012-06-21 at 11:54 +0400, Alexey Vlasov wrote: > > On Wed, Jun 20, 2012 at 02:28:18PM +0200, Mike Galbraith wrote: > > > > > > kernel/cgroup.c::cgroup_attach_task() > > > { > > > ... > > > synchronize_rcu(); > > > ... > > > } > > > > So nothing can be done here? (I mean if only I knew how to fix it I > > wouldn't ask about it ;) > > Sure, kill the obnoxious thing, it's sitting right in the middle of the > userspace interface. > > I banged on it a while back (wrt explosive android patches), extracted > RCU from the userspace interface. It seemed to work great, much faster, > couldn't make it explode. I wouldn't bet anything I wasn't willing to > immediately part with that the result was really really safe though ;-)
Or replace it with synchronize_rcu_expedited(). You can "get lucky" for quite some time removing synchronize_rcu() calls!
Thanx, Paul
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