linux-kernel - Re: [patch] Re: [perf] Finding uninstalled modules Was Re: mailing list for trace users

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Date:	Wed, 23 Sep 2009 12:02:39 +0200
From:	Mike Galbraith <efault@....de>
To:	Avi Kivity <avi@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...hat.com>, rostedt@...dmis.org,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Masami Hiramatsu <mhiramat@...hat.com>
Subject: Re: [patch] Re: [perf] Finding uninstalled modules Was Re: mailing
 list for trace users

On Wed, 2009-09-23 at 12:55 +0300, Avi Kivity wrote:
> On 09/23/2009 12:20 PM, Mike Galbraith wrote:
> >
> > Yup, brown baggie variety.  Oh darn.
> >
> > perf_counter tools: fix brown baggie module symbol loading bug.
> >
> > If there are no modules currently loaded, or the last module scanned is not
> > loaded, dso__load_modules() steps on the value from dso__load_vmlinux(), so
> > we happily load the kallsyms symbols on top of what we've already loaded.
> >
> > Fix that such that the total count of symbols loaded is returned.  Should
> > module symbol load fail after parsing of vmlinux, is's a hard failure, so
> > do not silently fall-back to kallsyms.
> >
> >    
> 
> Still fails, but differently.  Now 'annotate -k ... -m -v -v' doesn't 
> list vmx_vcpu_run at all, even though it's prominent in 'perf top'.
> 
> In addition to applying your patch I've merged current linus, so that 
> may have introduced the problem.
> 
> If I don't supply -k -m, I get
> 
> $ perf annotate  -v -v vmx_vcpu_run | grep vmx_vcpu
> new symbol: ffffffffa006f596 [0000dead]: vmx_vcpu_run    [kvm_intel], 
> hist: (nil), obj_start: (nil)
> new symbol: ffffffffa007025f [0000dead]: vmx_vcpu_put    [kvm_intel], 
> hist: (nil), obj_start: (nil)
> new symbol: ffffffffa0070bf6 [0000dead]: vmx_vcpu_load    [kvm_intel], 
> hist: (nil), obj_start: (nil)
> new symbol: ffffffffa0070d99 [0000dead]: vmx_vcpu_reset    [kvm_intel], 
> hist: (nil), obj_start: (nil)
> ffffffffa006f596-ffffffffa006fb73 vmx_vcpu_run    [kvm_intel]
>   ffffffffa007025f-ffffffffa007026e vmx_vcpu_put    [kvm_intel]
>   ffffffffa0070bf6-ffffffffa0070d98 vmx_vcpu_load    [kvm_intel]
>   ffffffffa0070d99-ffffffffa0071191 vmx_vcpu_reset    [kvm_intel]
>   Error: symbol 'vmx_vcpu_run' not present amongst the samples.

Yeah, I saw oddities with your config.  I'm rebuilding your config now
with more modules to do more testing.

	-Mike

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