Iprobe is an alpha-only system profiling suite which I'm porting from
Linux/alpha to FreeBSD.
Iprobe works by using the hardware profiling support built into
alpha cpus. In a nutshell, what Iprobe does is to setup the alpha
performance counters to sample the pc at a fairly high rate & dumps
those pc samples out to user space. Then some code runs to map the
sampled PCs to functions. You get a bit more than that (like the PSL
word, so you can tell if you're in the kernel or userland, what the
ipl is, etc).
a671d614ca