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SubjectRe: [patch] Re: [perf] Finding uninstalled modules Was Re: mailing list for trace users
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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