[lkml]   [2003]   [Nov]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: 2.6 /proc/interrupts fails on systems with many CPUs
    On Tue, 11 Nov 2003 11:21:01 -0600 Erik Jacobson <> 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

    MOTD: Always include version info.
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2005-03-22 13:58    [W:0.033 / U:31.552 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site