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

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Message-ID: <55F97A57.8020603@redhat.com>
Date:	Wed, 16 Sep 2015 16:19:03 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Tejun Heo <tj@...nel.org>, Oleg Nesterov <oleg@...hat.com>
Cc:	Christian Borntraeger <borntraeger@...ibm.com>,
	paulmck@...ux.vnet.ibm.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>
Subject: Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace
 signal_struct->group_rwsem with a global percpu_rwsem) causes regression for
 libvirt/kvm



On 16/09/2015 16:16, Tejun Heo wrote:
> On Wed, Sep 16, 2015 at 02:22:49PM +0200, Oleg Nesterov wrote:
>>> > > If the revert isn't easy, I think backporting rcu_sync is the best bet.
>> > 
>> > I leave this to Paul and Tejun... at least I think this is not v4.2 material.
> Will route reverts through cgroup branch.  Should be pretty painless.
> Nice job on percpu_rwsem.  It's so much better than having to come up
> with a separate middleground solution.

Thanks all for the quick resolution!

Paolo
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