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

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Message-ID: <20090922201746.GH5216@ghostprotocols.net>
Date:	Tue, 22 Sep 2009 13:17:46 -0700
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Mike Galbraith <efault@....de>, 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>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Masami Hiramatsu <mhiramat@...hat.com>
Subject: [perf] Finding uninstalled modules Was Re: mailing list for trace
	users

Em Tue, Sep 22, 2009 at 02:51:19PM +0300, Avi Kivity escreveu:
> On 09/22/2009 02:47 PM, Mike Galbraith wrote:
>>
>> Hm, must me a problem with parsing then.  If you add -v -v to the
>> command line it'll spit out debug data.  For vmx_vcpu_run you should see
>> a line like so if the module was parsed.
>>
>> new symbol: ffffffffa0065a49 [00000466]: ahci_interrupt, hist: (nil), obj_start: 0x2a49
>>
>> 	-Mike
>
> $ perf annotate -v -v -k ~avi/kvm/linux-2.6/vmlinux -m vmx_vcpu_run  |  

Here is the problem, he is passing a vmlinux, that way we don't parse
/proc/kallsyms, so no module symbols, he uses -m to load the modules
symbols but mod_dso__load_module_paths only looks at /lib/modules/, i.e.
installed modules.

I guess Avi hasn't installed modules, right? So the right fix for this
case is to figure out where modules are from the path given to -k, i.e.
we first use ~avi/kvm/linux-2.6/ as the modules path prefix and then
fallback to /lib/modules if we can't find modules there, right?

> grep vmx_vcpu_run
> new symbol: ffffffffa006f596 [0000dead]: vmx_vcpu_run    [kvm_intel],  
> hist: (nil), obj_start: (nil)
>  ffffffffa006f596-ffffffffa006fb73 vmx_vcpu_run    [kvm_intel]
>  Error: symbol 'vmx_vcpu_run' not present amongst the samples.
>
> Looks like internal confusion.
>
> -- 
> error compiling committee.c: too many arguments to function
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