22June2017 [FreeBSD WIKI]

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====== Hangout Notes 22 June 2017 ======

  * domagoj@ has some numbers to share and will send a set of measurements along to the group

  * Apple has added instructions and cycles as variables in their latest seed released at WWDC.  Source is not yet available.  There is a manual page but no test scripts.

  * bdkidney@ gave a talk at BSDCan covering the new things that CADETS is doing with DTrace.

  * markj@ brings up the issue of inline functions being visible but not traceable.  gnn@ asks about using the same tricks that are used in the PID provider in user space.  markj@ thinks we can target the reduced set of instructions to make this work for inline in the kernel.  The code all lives in fasttrap but we want this in FBT. 

  * gnn@ will ask emaste@ about compiling the kernel with LTO to see if that breaks DTrace

  * bdkidney@ now has LOOM talking to DTrace via the new dtrace_probe() system call

  * samuel@ is optimizing the unregister call because right now its a linear search and that's...slow.  He is also looking at deduping strings in DTrace since they take up a lot of space.