linux-kernel - Re: mailing list for trace users

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Date:	Tue, 22 Sep 2009 13:18:54 +0200
From:	Mike Galbraith <efault@....de>
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>,
	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>,
	postmaster@...r.kernel.org
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.
> 

Hm, dunno.  Using tip v2.6.31-7960-gf3da2f6, module annotation seems to
work fine here.

marge:/root/tmp # perf report -k vmlinux -m -d [kernel]|grep ahci_interrupt
     1.21%          swapper  [k] ahci_interrupt [ahci]
     0.11%            :7222  [k] ahci_interrupt [ahci]
     0.04%            :4876  [k] ahci_interrupt [ahci]
     0.02%            :6628  [k] ahci_interrupt [ahci]
     0.01%            :7452  [k] ahci_interrupt [ahci]
     0.01%            :7407  [k] ahci_interrupt [ahci]
marge:/root/tmp # perf annotate -k vmlinux -m ahci_interrupt|grep -C 20 Disassembly


------------------------------------------------
 Percent |      Source code & Disassembly of ahci.ko
------------------------------------------------
         :
         :
         :
         :      Disassembly of section .text:
         :
         :      0000000000002a49 <ahci_interrupt>:
         :                      ata_port_freeze(ap);
         :              }
         :      }
         :
         :      static irqreturn_t ahci_interrupt(int irq, void *dev_instance)
         :      {
    0.00 :          2a49:       55                      push   %rbp
    0.69 :          2a4a:       48 89 e5                mov    %rsp,%rbp
    0.00 :          2a4d:       41 57                   push   %r15
    0.00 :          2a4f:       49 89 f7                mov    %rsi,%r15
    0.00 :          2a52:       41 56                   push   %r14
    0.00 :          2a54:       41 55                   push   %r13
    0.00 :          2a56:       41 54                   push   %r12
    0.00 :          2a58:       53                      push   %rbx
    0.00 :          2a59:       48 83 ec 58             sub    $0x58,%rsp
         :      { asm volatile("mov" size " %0,%1": :reg (val), \
         :      "m" (*(volatile type __force *)addr) barrier); }
         :
marge:/root/tmp #


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