hi, Assuming 2.4 kernel. I just want to know when scheduler is invoked? 1.return from system call 2. return from interrupt(but not if inetrrupt happens in kernel mode) 3.What i had seen i want to share,i just redirected the timer0 interrupt to my interrupt handler and this invokation happens every 200 microseconds means 50 times in 10 milliseconds, but while returning path i did not call scheduler but just makes IRET,besides this redirection i am driving two kernel threads which continuosly sends data to remote computer, this means kernel thread-----get's preepmted by ----irq0 executing at 200 microsecond,but on interrupt return scheduler is not called,but control should returns to thread, (but threads are sleeping for 1 jiffies in between!) so they stops running ,this is because who will increment jiffies) and this i had printed and observe them they(jiffies) are not incremented,but system does not gets hanged, many more things i had observed,but i really dont clear when scheduler exaclty gets called! please forgive me if i had calculated some wrongly, thanks Prasanna __________________________________ Do you Yahoo!? Friends. Fun. Try the all-new Yahoo! Messenger. http://messenger.yahoo.com/ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
