On 05/03/2012 10:00 AM, Fernando Lopez-Lezcano wrote:
> The failure is because there is (as I pointed out) no fixed greppable
> relationship between the textual information found in /proc/asound/cards
> and the names of the processes that service the interrupts - I have
> looked at the relevant kernel code and the names of the processes are
> arbitrary strings.
Some good news! Something has changed from 2.6.33 to 3.2.x...
This finds all irq setup calls on the 3.2 kernel tree:
find sound/ -type f -exec grep -2 request_irq {] \; -print
The fourth argument to that call is what is going to be shown in the ps
listing. Now, I found that all _pci_ cards in 3.2.x have KBUILD_MODNAME
as the fourth argument (that was not the case before!). So anything
starting with "snd_" is going to be a soundcard, so rtirq could have
another special case for that.
Rui: this addition/hack in rtirq takes care of snd_hda_intel in my
3.2.16-rt27 system and will presumably do the right thing for any other
pci soundcards:
---- # Special for kernel-rt >= 2.6.31, where one can # prioritize shared IRQs by device driver (NAME2)... # first try with irq names that start with snd_ PIDS=`ps -eo pid,comm | egrep -i "IRQ.${IRQ}.snd_.*" | awk '{print $1}'` if [ -n "${PIDS}" ] then RTIRQ_TRAIL=":${IRQ}${RTIRQ_TRAIL}" else # try with the name reported in /proc/asound/cards PIDS=`ps -eo pid,comm | egrep -i "IRQ.${IRQ}.${NAME2:0:8}" | awk '{print $1}'` if [ -n "${PIDS}" ] then RTIRQ_TRAIL=":${IRQ}${RTIRQ_TRAIL}" else # Backward compability for older kernel-rt < 2.6.31... PIDS=`ps -eo pid,comm | egrep -i "IRQ.${IRQ}" | awk '{print $1}'` if [ -n "${PIDS}" ] then RTIRQ_TRAIL=":${IRQ}${RTIRQ_TRAIL}" fi fi fi ---- far from a solution, this is a list of sound/ subdirectories in 3.2 where this does not hold true: sound/ppc/ sound/mips/ sound/oss/ sound/arm sound/sparc/ sound/spi sound/soc sound/parisc sound/pcmcia/ sound/isa/ sound/drivers/ sound/atmel/ sound/aoa/ but it will work for a LOT of frequently used soundcards, at least when running 3.2 ... -- Fernando _______________________________________________ Linux-audio-user mailing list Linux-audio-user@email-addr-hidden http://lists.linuxaudio.org/listinfo/linux-audio-userReceived on Fri May 4 04:15:01 2012
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