Hi Namhyung, > From: Namhyung Kim [mailto:[email protected]] On Behalf Of Namhyung Kim > > - (ftrace) Support multiple SDTs on single event. > > > > Since multiple same SDTs are defined in a single binary (e.g. libc:setjump > > has 3 different entries on libc-2.17.so), we need the last feature on > > ftrace, so that a single uprobe event can occur several different > > probe points. > > Do you want to have multiple events of same name in the kernel? Or > to make perf handle those same names with different kernel events?
Good point, I meant the former. But the latter is also possible. Here is my idea; Suppose to define an event "foo" at "bar" function + 10byte offset with 2 arguments as below: # echo p:foo bar+10 arg1=%ax arg2=%dx > kprobe_events To add a probe point on the same event, use "+p" or "+r" instead of "p" or "r" and we can also change the assignment for each argument. # echo +p:foo bar+20 arg1=%cx arg2=0 >> kprobe_events Also, I guess we'll need to support a fixed value assignment because sometimes local valiables are optimized out. Thank you,
