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    SubjectRe: 2.6 /proc/interrupts fails on systems with many CPUs
    On Tue, 11 Nov 2003 11:21:01 -0600 Erik Jacobson <erikj@subway.americas.sgi.com> wrote:

    | Howdy.
    |
    | On systems with lots of processors (512 for example), catting /proc/interrupts
    | fails with a "not enough memory" error.
    |
    | This was observed in 2.6.0-test8
    |
    | I tracked this down to this in proc_misc.c:
    |
    | static int interrupts_open(struct inode *inode, struct file *file)
    | {
    | unsigned size = 4096 * (1 + num_online_cpus() / 8);
    | char *buf = kmalloc(size, GFP_KERNEL);
    |
    | The kmalloc fails here.
    |
    | I'm looking for suggestions on how to fix this. I came up with one fix
    | that seems to work OK for ia64. I have attached it to this message.
    | I'm looking for advice on what should be proposed for the real fix.

    An alternative is to limit 'size' to a maximum of 128 KB (or whatever
    the max. kmalloc() on ia64 is) and continue to use kmalloc().
    Does that work for you?

    Another alternative is to convert show_interrupts to use a seq_file
    iterator.

    --
    ~Randy
    MOTD: Always include version info.
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