Hello, I'm trying to fix and improve the dapptrace that comes with Mac OS X (10.11.6); its only clue about its version is a copyright from 2005 by Brendan Gregg. I have managed to fix reporting of only-user-functions, and now I would like to make the print flow indentation work better than the current kludge of resetting the depth every 100ms.
Looks like the problem is that the pid provider doesn't generate :return probes for all the functions for which it generates :entry probes, so whenever one of those non-return-probe function gets called, the depth can't ratchet back. Can anyone explain why those :return probes don't get generated, and/or how to fix or avoid it? I'm analyzing my own code, so recompiling is a possibility if it would help. Also, I see that the dtrace command itself has a -F option to "coalesce trace output by function", but I can't find any further explanation anywhere. Any idea of how well this works, and whether this suffers from the same problem of lack of :return probes? I'm assuming that studying the source of dtrace itself might be too involved (would I have to get into the kernel, assuming it's available?), but any pointers would be welcome. --- Horacio
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