On Tue, Jun 16, 2009 at 07:59:28AM +0000, Martin Shepherd wrote: > Suresh Kumar SHUKLA <suresh.shukla <at> st.com> writes: > > // get IRQ descriptor from IRQ, it contains pid > > desc = &irq_desc[IRQ_BASIC_TIMER_3_1]; > > That's a very useful clue. I was thinking that I would have to walk the process > tree to find the thread by name. Following up on this clue, it appears as though > in kernel 2.6.29.4 I should be able to use desc=irq_to_desc(irq) to look up the > IRQ descriptor, then use pid=get_task_pid(desc->thread), to get the PID of the > IRQ thread, then use sys_sched_setscheduler(pid,...) to change its priority. > I'll try that out in the morning. I wouldn't recommend calling sys_sched_setscheduler from kernel space. That's the userspace API and you need to pass a __user pointer as third argument. The right way is to do this change from userspace. Best regards Uwe -- Pengutronix e.K. | Uwe Kleine-König | Industrial Linux Solutions | http://www.pengutronix.de/ | -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
