Re: [PATCH 9/9] x86/UV: Add ability to disable UV NMI handler

2013-09-12 Thread Paul E. McKenney
On Thu, Sep 12, 2013 at 11:59:36AM -0700, Mike Travis wrote: > On 9/12/2013 10:27 AM, Paul E. McKenney wrote: > > On Tue, Sep 10, 2013 at 11:03:49AM +0200, Peter Zijlstra wrote: > >> On Mon, Sep 09, 2013 at 10:07:03AM -0700, Mike Travis wrote: > >>> On 9/9/2013 5:43 AM, Peter Zijlstra wrote: >

Re: [PATCH 9/9] x86/UV: Add ability to disable UV NMI handler

2013-09-12 Thread Paul E. McKenney
On Thu, Sep 12, 2013 at 08:48:33PM +0100, Hedi Berriche wrote: > On Thu, Sep 12, 2013 at 19:59 Mike Travis wrote: > | On 9/12/2013 10:27 AM, Paul E. McKenney wrote: > | > | > But what is it that you are looking for? If you want to silence it > | > completely, the rcu_cpu_stall_suppress boot/sysfs

Re: [PATCH 9/9] x86/UV: Add ability to disable UV NMI handler

2013-09-12 Thread Hedi Berriche
On Thu, Sep 12, 2013 at 19:59 Mike Travis wrote: | On 9/12/2013 10:27 AM, Paul E. McKenney wrote: | | > But what is it that you are looking for? If you want to silence it | > completely, the rcu_cpu_stall_suppress boot/sysfs parameter is what | > you want to use. | | We have by default rcutree.rc

Re: [PATCH 9/9] x86/UV: Add ability to disable UV NMI handler

2013-09-12 Thread Mike Travis
On 9/12/2013 10:27 AM, Paul E. McKenney wrote: > On Tue, Sep 10, 2013 at 11:03:49AM +0200, Peter Zijlstra wrote: >> On Mon, Sep 09, 2013 at 10:07:03AM -0700, Mike Travis wrote: >>> On 9/9/2013 5:43 AM, Peter Zijlstra wrote: On Thu, Sep 05, 2013 at 05:50:41PM -0500, Mike Travis wrote: > F

Re: [PATCH 9/9] x86/UV: Add ability to disable UV NMI handler

2013-09-12 Thread Mike Travis
On 9/12/2013 11:35 AM, Paul E. McKenney wrote: > On Thu, Sep 12, 2013 at 10:27:31AM -0700, Paul E. McKenney wrote: >> On Tue, Sep 10, 2013 at 11:03:49AM +0200, Peter Zijlstra wrote: >>> On Mon, Sep 09, 2013 at 10:07:03AM -0700, Mike Travis wrote: On 9/9/2013 5:43 AM, Peter Zijlstra wrote: >>

Re: [PATCH 9/9] x86/UV: Add ability to disable UV NMI handler

2013-09-12 Thread Paul E. McKenney
On Thu, Sep 12, 2013 at 10:27:31AM -0700, Paul E. McKenney wrote: > On Tue, Sep 10, 2013 at 11:03:49AM +0200, Peter Zijlstra wrote: > > On Mon, Sep 09, 2013 at 10:07:03AM -0700, Mike Travis wrote: > > > On 9/9/2013 5:43 AM, Peter Zijlstra wrote: > > > > On Thu, Sep 05, 2013 at 05:50:41PM -0500, Mik

Re: [PATCH 9/9] x86/UV: Add ability to disable UV NMI handler

2013-09-12 Thread Paul E. McKenney
On Tue, Sep 10, 2013 at 11:03:49AM +0200, Peter Zijlstra wrote: > On Mon, Sep 09, 2013 at 10:07:03AM -0700, Mike Travis wrote: > > On 9/9/2013 5:43 AM, Peter Zijlstra wrote: > > > On Thu, Sep 05, 2013 at 05:50:41PM -0500, Mike Travis wrote: > > >> For performance reasons, the NMI handler may be dis

Re: [PATCH 9/9] x86/UV: Add ability to disable UV NMI handler

2013-09-10 Thread Peter Zijlstra
On Mon, Sep 09, 2013 at 10:07:03AM -0700, Mike Travis wrote: > > > On 9/9/2013 5:43 AM, Peter Zijlstra wrote: > > On Thu, Sep 05, 2013 at 05:50:41PM -0500, Mike Travis wrote: > >> For performance reasons, the NMI handler may be disabled to lessen the > >> performance impact caused by the multiple

Re: [PATCH 9/9] x86/UV: Add ability to disable UV NMI handler

2013-09-09 Thread Mike Travis
On 9/9/2013 5:43 AM, Peter Zijlstra wrote: > On Thu, Sep 05, 2013 at 05:50:41PM -0500, Mike Travis wrote: >> For performance reasons, the NMI handler may be disabled to lessen the >> performance impact caused by the multiple perf tools running concurently. >> If the system nmi command is issued w

Re: [PATCH 9/9] x86/UV: Add ability to disable UV NMI handler

2013-09-09 Thread Peter Zijlstra
On Thu, Sep 05, 2013 at 05:50:41PM -0500, Mike Travis wrote: > For performance reasons, the NMI handler may be disabled to lessen the > performance impact caused by the multiple perf tools running concurently. > If the system nmi command is issued when the UV NMI handler is disabled, > the "Dazed a