linux-kernel - Re: linux-next: Tree for Feb 4

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Date:	Thu, 5 Feb 2015 10:34:12 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Dave Hansen <dave@...1.net>
Cc:	Steven Rostedt <rostedt@...dmis.org>, sedat.dilek@...il.com,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	linux-next <linux-next@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Kristen Carlson Accardi <kristen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>
Subject: Re: linux-next: Tree for Feb 4

On Thu, Feb 05, 2015 at 10:11:31AM -0800, Dave Hansen wrote:
> On 02/05/2015 10:08 AM, Steven Rostedt wrote:
> > --- a/include/trace/events/tlb.h
> > +++ b/include/trace/events/tlb.h
> > @@ -13,11 +13,13 @@
> >  	{ TLB_LOCAL_SHOOTDOWN,		"local shootdown" },		\
> >  	{ TLB_LOCAL_MM_SHOOTDOWN,	"local mm shootdown" }
> >  
> > -TRACE_EVENT(tlb_flush,
> > +TRACE_EVENT_CONDITION(tlb_flush,
> >  
> >  	TP_PROTO(int reason, unsigned long pages),
> >  	TP_ARGS(reason, pages),
> >  
> > +	TP_CONDITION(cpu_online(smp_processor_id())),
> 
> That's a pretty reasonable fix, although it would be nice if the
> debugging was easier to hit.

Looks very good to me!

Unless someone else speaks up, I will carry this patch.

>                               Did I actually need to be
> onlining/offlining CPUs to hit the splat that Sedat was reporting?

Yep, you do need to offline at least one CPU to hit that splat.

							Thanx, Paul

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