On Wed, Aug 21, 2013 at 05:09:28PM -0400, Joe Korty wrote: > On Wed, Aug 21, 2013 at 11:53:47AM -0400, Sebastian Andrzej Siewior wrote: > > Joe could you please test this one? In 3.10 we have one user of > > __irq_set_affinity_locked() and we might get more. > > Hi Sebastian, > I backported the patch to 3.6.11.6-rt38 and added a few printk's so that > when daemon started I would see that and when each affinity hook was > executed I would see that too. > > The system came up and the printk for daemon start showed up near where > the sfc driver started, but no affinity action printk appeared. Thus > the patch as written does not seem to work. Hi Sebastian, Today I intrumented both the nort and rt paths through the affinity hook logic, and built and booted both nort and rt kernels. Here is what I found: For the nort kernel, each time I change the affinity of one of the SFC driver IRQs listed in /proc/interrupts, I get a notice in dmesg that the SFC callback was invoked. For the rt kernel, I get the message only for the first time the affinity for some SFC IRQ is changed. Subsequent changes of the _same_ IRQ do not have the callback invoked. If I go and change some other SFC IRQ that will also invoke the callback the first time only. finny# echo 1 >/proc/irq/46/smp_affinity; dmesg | fgrep genirq genirq: set_affinity_thread STARTED genirq: NOTIFIER CALLED ... finny# echo 1 >/proc/irq/46/smp_affinity; dmesg | fgrep genirq genirq: set_affinity_thread STARTED genirq: NOTIFIER CALLED ... finny# echo 1 >/proc/irq/46/smp_affinity; dmesg | fgrep genirq genirq: set_affinity_thread STARTED genirq: NOTIFIER CALLED ... finny# echo 2 >/proc/irq/46/smp_affinity; dmesg | fgrep genirq genirq: set_affinity_thread STARTED genirq: NOTIFIER CALLED ... finny# echo 2 >/proc/irq/47/smp_affinity; dmesg | fgrep genirq genirq: set_affinity_thread STARTED genirq: NOTIFIER CALLED ... genirq: NOTIFIER CALLED ... finny# echo 2 >/proc/irq/47/smp_affinity; dmesg | fgrep genirq genirq: set_affinity_thread STARTED genirq: NOTIFIER CALLED ... genirq: NOTIFIER CALLED ... finny# echo 1 >/proc/irq/47/smp_affinity; dmesg | fgrep genirq genirq: set_affinity_thread STARTED genirq: NOTIFIER CALLED ... genirq: NOTIFIER CALLED ... Regards, Joe -- 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
