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

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Date:	Tue, 15 Sep 2015 21:35:47 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Tejun Heo <tj@...nel.org>
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

On Tue, Sep 15, 2015 at 09:24:15PM -0400, Tejun Heo wrote:
> Hello, Paul.
> 
> On Tue, Sep 15, 2015 at 04:38:18PM -0700, Paul E. McKenney wrote:
> > Well, the decision as to what is too big for -stable is owned by the
> > -stable maintainers, not by me.
> 
> Is it tho?  Usually the subsystem maintainer knows the best and has
> most say in it.  I was mostly curious whether you'd think that the
> changes would be too risky.  If not, great.

I do hope that they would listen to what I thought about it, but at
the end of the day, it is the -stable maintainers who pull a given
patch, or don't.

> > 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.

							Thanx, Paul

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