On Thu, Apr 10, 2008 at 3:32 PM, bhanu nani <bhanu.lnxnew@xxxxxxxxx> wrote: > Hi all, > > I am trying to test kernel preemption in my driver. When I first > compiled the Linux kernel and tested it, I found it to be > non-preemptible. Later I realised that my kernel was build with > premption disabled. I enabled kernel premption in processort section > i.e. CONFIG_PREEMPT and rebuild it. First time I read this article: http://www.linuxdevices.com/articles/AT8211887833.html and I learned tons a lot. And this: http://www.ussg.iu.edu/hypermail/linux/kernel/0403.2/0545.html So I think advisable NOT to set CONFIG_PREEMPT. > Even with change in the kernel preemption does not work. I am trying > it on my latest stable kernel. > > Test code: > -------------- > read() > { > if(down_interruptible()) > return error; > mdelay(10000); > up(); > } > > With this code in place, I try to do a 'CTRL+C' when it hangs at that delay. As what Mulyadi has asked, how can u enter ctrl-C to some program that u write in userspace, and expect it to stop a kernelspace module (from the API u used above)? Are u doing some kind of UML? > It does not respond to my 'CTRL + C'. > > Where am I missing the preemption thing in the kernel? > > Regards, > Bhanu J > > -- > To unsubscribe from this list: send an email with > "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx > Please read the FAQ at http://kernelnewbies.org/FAQ > > -- Regards, Peter Teoh -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
