Re: [patch] Re: [perf] Finding uninstalled modules Was Re: mailinglist for trace users

[Avi Kivity]

On 09/23/2009 04:50 PM, Mike Galbraith wrote:
> 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.
>
>    

Mine says:

  kernel/arch/x86/kvm/kvm.ko:
  kernel/arch/x86/kvm/kvm-intel.ko: kernel/arch/x86/kvm/kvm.ko

Which is reasonable for /lib/modules/2.6.31, not for a source directory.

> /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);
>    

len + 1

>          if (path == NULL)
>                  goto out_failure;
>
>          strcat(path, "/lib/modules/");
>          strcat(path, uts.release);
>          strcat(path, "/modules.dep");
>
>          file = fopen(path, "r");
>
>    

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

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