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Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace signal_struct->group_rwsem with a global percpu_rwsem) causes regression for libvirt/kvm

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Hello,

On Tue, Sep 15, 2015 at 02:38:30PM -0700, Paul E. McKenney wrote:
> I did take a shot at adding the rcu_sync stuff during this past merge
> window, but it did not converge quickly enough to make it.  It looks
> quite good for the next merge window.  There have been changes in most
> of the relevant areas, so probably best to just try them and see which
> works best.

Heh, I'm having a bit of trouble following.  Are you saying that the
changes would be too big for -stable?  If so, I'll send out reverts of
the culprit patches and then reapply them for this cycle so that it
can land together with the rcu changes in the next merge window, but
it'd be great to find out whether the rcu changes are enough for the
issue that Christian is seeing to go away.  If not, I'll switch to a
different locking scheme and mark those patches w/ stable tag.

Thanks!

-- 
tejun
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[4.2] commit d59cfc09c32 (sched, cgroup: replace  signal_struct->group_rwsem with a global percpu_rwsem) causes regression for  libvirt/kvm Christian Borntraeger <borntraeger@de.ibm.com> - 2015-09-15 14:10 +0200
  Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace  signal_struct->group_rwsem with a global percpu_rwsem) causes regression for  libvirt/kvm Peter Zijlstra <peterz@infradead.org> - 2015-09-15 15:10 +0200
    Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace  signal_struct->group_rwsem with a global percpu_rwsem) causes regression for  libvirt/kvm Christian Borntraeger <borntraeger@de.ibm.com> - 2015-09-15 15:40 +0200
      Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace  signal_struct->group_rwsem with a global percpu_rwsem) causes regression for  libvirt/kvm Tejun Heo <tj@kernel.org> - 2015-09-15 16:00 +0200
      Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace  signal_struct->group_rwsem with a global percpu_rwsem) causes regression for  libvirt/kvm Paolo Bonzini <pbonzini@redhat.com> - 2015-09-15 18:50 +0200
        Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace  signal_struct->group_rwsem with a global percpu_rwsem) causes regression for  libvirt/kvm "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-09-15 19:40 +0200
          Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace  signal_struct->group_rwsem with a global percpu_rwsem) causes regression for  libvirt/kvm Paolo Bonzini <pbonzini@redhat.com> - 2015-09-16 10:40 +0200
            Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace  signal_struct->group_rwsem with a global percpu_rwsem) causes regression for  libvirt/kvm Christian Borntraeger <borntraeger@de.ibm.com> - 2015-09-16 11:00 +0200
              Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace  signal_struct->group_rwsem with a global percpu_rwsem) causes regression for  libvirt/kvm Paolo Bonzini <pbonzini@redhat.com> - 2015-09-16 11:20 +0200
                Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace  signal_struct->group_rwsem with a global percpu_rwsem) causes  regression for libvirt/kvm Oleg Nesterov <oleg@redhat.com> - 2015-09-16 14:30 +0200
                Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace  signal_struct->group_rwsem with a global percpu_rwsem) causes regression for  libvirt/kvm Paolo Bonzini <pbonzini@redhat.com> - 2015-09-16 14:40 +0200
                Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace  signal_struct->group_rwsem with a global percpu_rwsem) causes  regression for libvirt/kvm Oleg Nesterov <oleg@redhat.com> - 2015-09-16 14:50 +0200
                Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace  signal_struct->group_rwsem with a global percpu_rwsem) causes regression for  libvirt/kvm Christian Borntraeger <borntraeger@de.ibm.com> - 2015-09-16 15:00 +0200
                Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace  signal_struct->group_rwsem with a global percpu_rwsem) causes regression for  libvirt/kvm Tejun Heo <tj@kernel.org> - 2015-09-16 16:20 +0200
                Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace  signal_struct->group_rwsem with a global percpu_rwsem) causes regression for  libvirt/kvm Paolo Bonzini <pbonzini@redhat.com> - 2015-09-16 16:20 +0200
        Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace  signal_struct->group_rwsem with a global percpu_rwsem) causes regression for  libvirt/kvm Christian Borntraeger <borntraeger@de.ibm.com> - 2015-09-15 23:20 +0200
          Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace  signal_struct->group_rwsem with a global percpu_rwsem) causes regression for  libvirt/kvm Tejun Heo <tj@kernel.org> - 2015-09-15 23:30 +0200
            Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace  signal_struct->group_rwsem with a global percpu_rwsem) causes regression for  libvirt/kvm "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-09-15 23:40 +0200
              Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace  signal_struct->group_rwsem with a global percpu_rwsem) causes regression for  libvirt/kvm Tejun Heo <tj@kernel.org> - 2015-09-16 00:30 +0200
                Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace  signal_struct->group_rwsem with a global percpu_rwsem) causes regression for  libvirt/kvm "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-09-16 01:40 +0200
                Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace  signal_struct->group_rwsem with a global percpu_rwsem) causes regression for  libvirt/kvm Tejun Heo <tj@kernel.org> - 2015-09-16 03:30 +0200
                Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace  signal_struct->group_rwsem with a global percpu_rwsem) causes regression for  libvirt/kvm "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-09-16 06:40 +0200
                Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace  signal_struct->group_rwsem with a global percpu_rwsem) causes regression for  libvirt/kvm Tejun Heo <tj@kernel.org> - 2015-09-16 13:10 +0200
                Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace  signal_struct->group_rwsem with a global percpu_rwsem) causes regression for  libvirt/kvm Christian Borntraeger <borntraeger@de.ibm.com> - 2015-09-16 09:50 +0200
                Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace  signal_struct->group_rwsem with a global percpu_rwsem) causes regression for  libvirt/kvm Christian Borntraeger <borntraeger@de.ibm.com> - 2015-09-16 13:00 +0200
                Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace  signal_struct->group_rwsem with a global percpu_rwsem) causes regression for  libvirt/kvm Tejun Heo <tj@kernel.org> - 2015-09-16 13:10 +0200
                Re: [4.2] commit d59cfc09c32 (sched, cgroup: replace  signal_struct->group_rwsem with a global percpu_rwsem) causes regression for  libvirt/kvm Christian Borntraeger <borntraeger@de.ibm.com> - 2015-09-16 14:00 +0200
  [PATCH cgroup/for-4.3-fixes 1/2] Revert "cgroup: simplify  threadgroup locking" Tejun Heo <tj@kernel.org> - 2015-09-16 18:00 +0200
    [PATCH cgroup/for-4.3-fixes 2/2] Revert "sched, cgroup: replace  signal_struct->group_rwsem with a global percpu_rwsem" Tejun Heo <tj@kernel.org> - 2015-09-16 18:00 +0200
    Re: [PATCH cgroup/for-4.3-fixes 1/2] Revert "cgroup: simplify  threadgroup locking" Oleg Nesterov <oleg@redhat.com> - 2015-09-16 19:10 +0200
    Re: [PATCH cgroup/for-4.3-fixes 1/2] Revert "cgroup: simplify  threadgroup locking" Christian Borntraeger <borntraeger@de.ibm.com> - 2015-09-16 20:50 +0200

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