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Looking to see, illustrated, how the kernel does access some PCI soundcard. E.g., device I/O, device registers, function calls (including calls to DMA, data not required - can guess it from sources). Want to get a log, <...read it, write some script to make a Graphviz chart>,

I can setup virtual machine for testing, had pointed out several things to look upon in ALSA code, but still have no idea how to get the whole stuff tracked in realtime..

The ideal debug mode for me is to enter debugging mode, load modules, call aplay to send data to sound card, unload modules, exit debugging mode, dump debugging log to file.. Any kind of recommendations would be fine.

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closed as not a real question by garyjohn, Karan, sudo, Dave M, Tanner Feb 8 '13 at 15:31

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

1 Answer 1

up vote -1 down vote accepted

systemtap and source code. source code and systemtap.

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