Hi, Nathan -
nathans wrote:
> [...]
> (OOC, what's {MODULE_NAME} in this context?)
It is usually a machine-generated unique identifier for the systemtap
script in question, such as "stap_deadbeefdeadbeefdeadbeef_2222". It
is not generally predictable in advance. (A user can override the
name, but that costs possible collisions.)
> [...] PMDA is written to be able to detect arrival/departure of new
> MMV files based on changes in a directory (and the location of that
> directory is parameterised via /etc/pcp.conf variables). [...]
If we do end up sticking with this MMV approach, the PMDA would
probably need to use glob(3) or similar to search for
"/proc/systemtap/*/mmv" instead of "/proc/mmv/*".
> It also occurs to me that there's not really anything
> systemtap-specific about the kernel MMV instrumentation you've done,
> or is there? [...] It would be worth thinking about if the MMV
> bits in your script could become a more general kernel module for
> others to use too [...]
Yes, perhaps, though the path of code implementing a seemingly good
idea into the kernel is rarely smooth. They generally dislike
infrastructure unless it's well-yearned-for. So, if you wish to
pursue this goal, some serious selling on LKML will be needed.
- FChE
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