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

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: >

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,

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

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 disabled to

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, Mike Travis

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: On Thu,

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: For performance

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

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 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: On Thu, Sep

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

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 perf

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

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

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 and

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 when