ImperialViolet

Systrace timing tests:

Test	Normal	With Systrace
getuid	0.871	1.38
getpid	0.871	1.38
stat	0.871	1.38

All 3 tests did a million calls of their respective syscalls. The first two were setup in systrace to allow everything. The filesystem test was setup to allow only if a regexp matched.

Conclusion: the overhead is pretty much fixed - and not really that huge unless you are really syscall dependant.