linux-kernel - Re: Testing tracer wakeup_rt: .. no entries found ..FAILED!

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Date:	Tue, 31 Jul 2012 15:50:51 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Fengguang Wu <fengguang.wu@...el.com>,
	Steven Rostedt <srostedt@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>
Subject: Re: Testing tracer wakeup_rt: .. no entries found ..FAILED!

On 07/31/2012 03:43 PM, Steven Rostedt wrote:
> On Tue, 2012-07-31 at 15:37 +0300, Avi Kivity wrote:
>> On 07/31/2012 03:17 PM, Fengguang Wu wrote:
>> > 
>> > It's good to quickly get to the root cause :) Can we possibly detect
>> > whether we are in a virtual machine and hence skip this particular
>> > test case?
>> 
>> cpu_has(&boot_cpu, X86_FEATURE_HYPERVISOR)
>> 
> 
> Yeah, but then it is still broken on non-x86 code (the test lives in
> core kernel).
> 
> As it is just testing the events for wakeup, I could probably just add a
> completion and force the other thread to just wait for it. I'll write up
> a patch. But it wont make it in till 3.7.

That would be better.  A hypervisor might be real-time capable (with
some effort kvm can do this), so we don't want to turn off real time
features just based on that.


-- 
error compiling committee.c: too many arguments to function


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