* heuristic to go farther during stack traces.
* significantly improved Linux thread handing.
acid:
* update to new libmach interface.
prof:
* use new libmach interface.
* multiple thread support (derived from Rob's copy).
* first steps toward pprof-like graphs:
keep counters indexed by pc,callerpc pairs.
R=r
DELTA=909 (576 added, 123 deleted, 210 changed)
OCL=24240
CL=24259
if you clone inside a traced pid, the child
is automatically attached and stopped,
apparently.
R=r
DELTA=63 (41 added, 12 deleted, 10 changed)
OCL=24096
CL=24106
