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    SubjectRe: [PATCH 3/3] vmalloc: Add debugfs modfraginfo
    On Thu, Jun 21, 2018 at 12:12 AM Rick Edgecombe
    <rick.p.edgecombe@intel.com> wrote:
    > Add debugfs file "modfraginfo" for providing info on module space
    > fragmentation. This can be used for determining if loadable module
    > randomization is causing any problems for extreme module loading situations,
    > like huge numbers of modules or extremely large modules.
    >
    > Sample output when RANDOMIZE_BASE and X86_64 is configured:
    > Largest free space: 847253504
    > External Memory Fragementation: 20%
    > Allocations in backup area: 0
    >
    > Sample output otherwise:
    > Largest free space: 847253504
    > External Memory Fragementation: 20%
    [...]
    > + seq_printf(m, "Largest free space:\t\t%lu\n", largest_free);
    > + if (total_free)
    > + seq_printf(m, "External Memory Fragementation:\t%lu%%\n",

    "Fragmentation"

    > + 100-(100*largest_free/total_free));
    > + else
    > + seq_puts(m, "External Memory Fragementation:\t0%%\n");

    "Fragmentation"

    [...]
    > +static const struct file_operations debug_module_frag_operations = {
    > + .open = proc_module_frag_debug_open,
    > + .read = seq_read,
    > + .llseek = seq_lseek,
    > + .release = single_release,
    > +};
    >
    > +static void debug_modfrag_init(void)
    > +{
    > + debugfs_create_file("modfraginfo", 0x0400, NULL, NULL,
    > + &debug_module_frag_operations);

    0x0400 is 02000, which is the setgid bit. I think you meant to type 0400?

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