Sorry....i don't understand what u meant :-): On Sat, Jul 26, 2008 at 8:39 PM, Mulyadi Santosa <mulyadi.santosa@xxxxxxxxx> wrote: > NB: Anyway, I just found out that we know have ftrace in latest kernel... > what is this ftrace to do with the present discussion? I am really eager to learn this thing...let's discuss: a. how is ftrace different from utrace? utrace, as i understood from Roland's email, is that he is getting rid of all the ptrace stuff, and replacing it with utrace....overcoming all the latency problems in ptracing.... so theoretically ptracing is supposed to be much faster. have not understood Roland's patches yet....not sure how ptrace is being patched by utrace. Let's learn and share: http://lwn.net/Articles/224779/ utrace infrastructure has already been used by a Japanese to debug a userspace program "xeyes"...amazing.. b. ftrace......by Steve from redhat, is for tracing latency scheduler...if i understood correctly.....but it is least understood by me.... c. the one amazes me a lot is LTTng....Matthieu mentioned that it can trace almost anything, even interrupt and memory pagefault mechanism.......as it avoid the use of spinlocks when in its infrastructure... d. now....systemtap is beginning to use the utrace infrastructure as well....just heard of it only....someone please show a sample systemtap script that uses utrace infrastructure? e. btw...what is the difference between tracehook and kprobe? then jprobe? lots of terminology....but not sure if all boils down to the same thing....? Hm....got lots of stuff to checkout.. -- Regards, Peter Teoh -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
