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    SubjectRe: Realtime Preemption, 2.6.12, Beginners Guide?

    * Alistair John Strachan <s0348365@sms.ed.ac.uk> wrote:

    > > great! Do the softlockup warnings still occur?
    >
    > Yes, but in no greater a number.

    could you apply the patch below, so that we can see what kind of time
    gap the softlockup detector encountered?

    Ingo

    Index: linux/kernel/softlockup.c
    ===================================================================
    --- linux.orig/kernel/softlockup.c
    +++ linux/kernel/softlockup.c
    @@ -65,8 +65,8 @@ void softlockup_tick(void)
    per_cpu(print_timestamp, this_cpu) = timestamp;

    spin_lock(&print_lock);
    - printk(KERN_ERR "BUG: soft lockup detected on CPU#%d!\n",
    - this_cpu);
    + printk(KERN_ERR "BUG: soft lockup detected on CPU#%d! %ld-%ld\n",
    + this_cpu, jiffies, timestamp);
    dump_stack();
    #if defined(__i386__) && defined(CONFIG_SMP)
    nmi_show_all_regs();
    -
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