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 12:55:26 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Mike Galbraith <efault@....de>
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 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.

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

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