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 15:50:00 +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 16:10 +0300, Avi Kivity wrote:
> On 09/23/2009 03:58 PM, Avi Kivity wrote:On 09/23/2009 03:58 PM, Avi 
> Kivity wrote:
> > Not for me.  'perf report', for example, shows
> >
> >     63.08%  qemu-system-x86  
> > [kernel]                                              [k] packet_exit
> >      4.71%  qemu-system-x86  
> > [kernel]                                              [k] hpet_next_event
> >      4.38%             init  
> > [kernel]                                              [k] 
> > mwait_idle_with_hints
> >
> > While 'perf top' still shows vmx_vcpu_run.
> >
> 
> strace says:
> 
>     getcwd("/home/avi/kvm/linux-2.6"..., 4096) = 24
>     ...
>     [no chdir]
>     ...
>     open("kernel/arch/x86/kvm/kvm-intel.ko", O_RDONLY) = -1 ENOENT (No 
> such file or directory)

*blink*

> That "kernel/" looks like it was meant for /lib/modules, not a kernel 
> tree.  If I run 'perf report' from /lib/modules/2.6.31 I see vmx_vcpu_run.

So I need what's in your modules.dep to figure out where the rest of the
path went.

/lib/modules/2.6.32-tip-smp/kernel/arch/x86/kvm/kvm-intel.ko

static int mod_dso__load_module_paths(struct mod_dso *self)
{
        struct utsname uts;
        int count = 0, len;
        char *line = NULL;
        FILE *file;
        char *path;
        size_t n;

        if (uname(&uts) < 0)
                goto out_failure;

        len = strlen("/lib/modules/");
        len += strlen(uts.release);
        len += strlen("/modules.dep");

        path = calloc(1, len);
        if (path == NULL)
                goto out_failure;

        strcat(path, "/lib/modules/");
        strcat(path, uts.release);
        strcat(path, "/modules.dep");

        file = fopen(path, "r");


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