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