On Wed, Oct 14, 2009 at 4:04 PM, Leonidas . <leonidas137@xxxxxxxxx> wrote: > Hi, > > I am running Ubuntu Jaunty currently, with kernel version 2.6.28 kernel. > I was assuming that, all the kernels above 2.6 will have CONFIG_PREEMPT > =1 by default, but my default kernel does not have it set. > > Is that the norm? I can understand certain use cases which might require > the kernel to be non pre-emptible but even a regular desktop distro does > not have it set? Surprising? > > -Leo. > > -- > To unsubscribe from this list: send an email with > "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx > Please read the FAQ at http://kernelnewbies.org/FAQ > > Hi Leo, I think this is just the config option set into your local source code. This does not mean your running kernel is preempt disabled. You can probably run this command to check whether your running kernel has preemption feature. preemptive kernel :- vinitd@pe-lt271:~$ cat /proc/kallsyms | grep preempt c0121550 T preempt_notifier_register c0121580 T preempt_notifier_unregister c012a350 t check_preempt_curr_idle c012ab50 t check_preempt_curr_rt c012ac50 t check_preempt_wakeup c045a8f0 r __ksymtab_preempt_notifier_unregister c045a8f8 r __ksymtab_preempt_notifier_register c045ed3c r __kcrctab_preempt_notifier_unregister c045ed40 r __kcrctab_preempt_notifier_register c0460612 r __kstrtab_preempt_notifier_unregister c046062e r __kstrtab_preempt_notifier_register c0477824 D preempt_mark_thresh f8fc8a68 d kvm_preempt_ops [kvm] c0121550 u preempt_notifier_register [kvm] c0121580 u preempt_notifier_unregister [kvm] f8d46000 t lp_preempt [lp] vinitd@pe-lt271:~$ -Vinit -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
