lkml.org 
[lkml]   [2011]   [Jun]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectOne Interrupted Threads per Interrupt line?
Hi,

I'm using Ubuntu 10.04 with the 2.6.31-11-rt patch installed. I'm
developing a PCI device driver using hardware interrupts.
I read in the “Internals of the RT Patch” document
(http://www.kernel.org/doc/ols/2007/ols2007v2-pages-161-172.pdf ) that
when a device driver requests an IRQ, a thread is created to service
this interrupt line (Threaded interrupts). Only ONE thread can be
created per interrupt line, so shared interrupts are still handled by a
single thread.

My driver requests IRQ 16, which is shared with others handlers. Typing
on the shell $ps -eo pid,pri,rtprio,cmd I can see my driver requesting
irq 16 and with 50 RTPRIO. At the same time I can see the others drivers
requesting IRQ 16 with different real time priorities than mine( 80, 85,
50). Does this mean that there are more than ONE Threaded Interrupts for
IRQ 16? or it's just the thread priority when running each handler for
IRQ 16?
Finally, how could I change the 50 RT PRIO for my handler pci_9111?

Here you have the shell:

PID PRI RTPRIO CMD

658 120 80 [irq/16-uhci_hcd]
3852 125 85 [irq/16-HDA Inte]
4303 90 50 [irq/16-radeon@p]
5863 90 50 [irq/16-pci_9111]
5865 19 - ps -eo pid,pri,rtprio,cmd


Thank you very much,

Mónica
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2011-06-04 13:51    [W:2.198 / U:0.028 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site