linux-kernel - Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace signal_struct->group_rwsem with a global percpu

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Message-ID: <20150916110637.GB17047@htj.duckdns.org>
Date:	Wed, 16 Sep 2015 07:06:37 -0400
From:	Tejun Heo <tj@...nel.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Christian Borntraeger <borntraeger@...ibm.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	"linux-kernel@...r.kernel.org >> Linux Kernel Mailing List" 
	<linux-kernel@...r.kernel.org>, KVM list <kvm@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>
Subject: Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace
 signal_struct->group_rwsem with a global percpu_rwsem) causes regression for
 libvirt/kvm

Hello,

On Tue, Sep 15, 2015 at 09:35:47PM -0700, Paul E. McKenney wrote:
> > > I am suggesting trying the options and seeing what works best, then
> > > working to convince people as needed.
> > 
> > Yeah, sure thing.  Let's wait for Christian.
> 
> Indeed.  Is there enough benefit to risk jamming this thing into 4.3?
> I believe that 4.4 should be a no-brainer.

In that case, I'm gonna revert the threadcgroup percpu_rwsem
conversion patches through -stable and reapply them for 4.4 merge
window.

Thanks!

-- 
tejun
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