linux-kernel - Re: mailing list for trace users

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Date:	Tue, 22 Sep 2009 12:59:39 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Avi Kivity <avi@...hat.com>
Cc:	rostedt@...dmis.org, LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Mike Galbraith <efault@....de>
Subject: Re: mailing list for trace users

On Tue, 2009-09-22 at 12:13 +0300, Avi Kivity wrote:
> 
> Yes please.  Here's a question to start it off - how to I 'perf 
> annotate' a symbol in a module?
> 
> $ perf report
> # Samples: 68202
> #
> # Overhead          Command  Shared Object  Symbol
> # ........  ...............  .............  ......
> #
>      84.17%  qemu-system-x86  [kernel]       [k] vmx_vcpu_run
> [kvm_intel]
>       4.28%  qemu-system-x86  [kernel]       [k]
> kvm_arch_vcpu_ioctl_run 
> [kvm]
>       0.88%  qemu-system-x86  [kernel]       [k] add_preempt_count
>       0.75%  qemu-system-x86  [kernel]       [k]
> _spin_unlock_irqrestore
>       0.68%  qemu-system-x86  [kernel]       [k] _spin_lock_irq
> 
> $ perf annotate -k ~avi/kvm/linux-2.6/vmlinux -m vmx_vcpu_run
>   Error: symbol 'vmx_vcpu_run' not present amongst the samples.
> 
> builtin symbols work.

We need a /proc/modules parser that then also locates and loads .ko
files which aren't stripped.

I think Mike played around with that a bit.

The typical problem is that people use 'make INSTALL_MOD_STRIP=1
modules_install' to install their modules, because otherwise the initrd
thingies explode, the side effect is that the !initrd modules are
stripped too.

Ideally initrd tools should strip whatever they stick in. Then again,
ideally we'd not have any initrd and modules crap to begin with ;-)

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