Hi Kim, > > >HI, > > >Please enable kprobe_event config option in the kernel and build the same > > >and boot the board using it. Then please try to add event using perf probe > > >command > > > > Thanks very much for your reply, and I already enable DEBUG_KPROBE_EVENT in > > kernel. > > I did success in "perf probe handle_mm_fault". > > > > But when i want to to "perf probe" other Kernel symbol, such as > > do_page_fault. > > I came across other problems: > > Added new event: > > Failed to write event: Invalid argument > > Error: Failed to add events. (-1) > > And when i type perf probe page_fault_entry: > > Kernel symbol 'page_fault_entry' not found. > > Error: Failed to add events. (-2) > > Please notice that "do_page_fault" and "page_fault_entry" are all Kernel > > symbols, which canbe find in "/proc/kallsyms", but not recorgonized by > > perf (or even kprobe). > > Any idea for that? > For some reason, do_page_fault() is marked as __kprobe on some arch > which means it cannot be probed. > Thanks, > Namhyung
My kernel is runing on X86_64 arch, is there any chance for me to get the do_page_fault() entry/exit work? Or How can i add a exit tracepoint for handle_mm_fault()? so I can calculate the latency of that fault handle function? Best, Chen -- To unsubscribe from this list: send the line "unsubscribe linux-perf-users" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
