Dear Mukund On 2/7/06, Mukund JB. <mukundjb@xxxxxxxxxxxxxxxxxxxxx> wrote: > > > AFAIK in kernel without preemption and no SMP the process (kernel > > process) will never be rescheduled until unless it voluntarily call > > schedule or releases CPU. You can see this behaviour by just inserting > > while(1); (infinite loop) with-in your module and your system will > > hang ! (CMIIW) > > I have tried this earlier version of 2.4 kernels and found what you > mentioned. I found the same on 2.6.x kernel with Preemption & SMP > disabled. > Right :) > But, when I tried this on a 2.6.x kernel with Preemption & SMP enabled I > fond that the kernel hangs with some messages. > Can you tell what are the messages ? > I tried this by inserting a "while (1);" in close call. When APP calls > close () call I found the kernel hangs for a while & immediately results > in a crash. > What is the reason for this? Is it the timer interrupt (ISR)that causes > this? > I tested this on a SMP machine (actually EM64T Machine running 32-bit 2.6.11 with HyperThreading Enabled) but preemption is __not__ enabled. And its working (means system remains responsive and do other works too) until I won't start X-Server, as whenever I start X, the system hangs/crashes and I won't able to see any messages. So, I think the problem is due to some X-Server else its fine but I can't state the exact reason for it ! -- Fawad Lateef -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
