From b102f1d0f1cd0bb5ec82e5aeb1e33502d6ad6710 Mon Sep 17 00:00:00 2001 From: Namhyung Kim Date: Wed, 27 Jun 2012 09:41:39 +0900 Subject: tracing/kvm: Use __print_hex() for kvm_emulate_insn tracepoint The kvm_emulate_insn tracepoint used __print_insn() for printing its instructions. However it makes the format of the event hard to parse as it reveals TP internals. Fortunately, kernel provides __print_hex for almost same purpose, we can use it instead of open coding it. The user-space can be changed to parse it later. That means raw kernel tracing will not be affected by this change: # cd /sys/kernel/debug/tracing/ # cat events/kvm/kvm_emulate_insn/format name: kvm_emulate_insn ID: 29 format: ... print fmt: "%x:%llx:%s (%s)%s", REC->csbase, REC->rip, __print_hex(REC->insn, REC->len), \ __print_symbolic(REC->flags, { 0, "real" }, { (1 << 0) | (1 << 1), "vm16" }, \ { (1 << 0), "prot16" }, { (1 << 0) | (1 << 2), "prot32" }, { (1 << 0) | (1 << 3), "prot64" }), \ REC->failed ? " failed" : "" # echo 1 > events/kvm/kvm_emulate_insn/enable # cat trace # tracer: nop # # entries-in-buffer/entries-written: 2183/2183 #P:12 # # _-----=> irqs-off # / _----=> need-resched # | / _---=> hardirq/softirq # || / _--=> preempt-depth # ||| / delay # TASK-PID CPU# |||| TIMESTAMP FUNCTION # | | | |||| | | qemu-kvm-1782 [002] ...1 140.931636: kvm_emulate_insn: 0:c102fa25:89 10 (prot32) qemu-kvm-1781 [004] ...1 140.931637: kvm_emulate_insn: 0:c102fa25:89 10 (prot32) Link: http://lkml.kernel.org/n/tip-wfw6y3b9ugtey8snaow9nmg5@git.kernel.org Link: http://lkml.kernel.org/r/1340757701-10711-2-git-send-email-namhyung@kernel.org Cc: Arnaldo Carvalho de Melo Cc: Frederic Weisbecker Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Namhyung Kim Cc: kvm@vger.kernel.org Acked-by: Avi Kivity Signed-off-by: Namhyung Kim Signed-off-by: Steven Rostedt --- include/trace/ftrace.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/trace') diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h index 7697249..c6bc2fa 100644 --- a/include/trace/ftrace.h +++ b/include/trace/ftrace.h @@ -571,6 +571,7 @@ static inline void ftrace_test_probe_##call(void) \ #undef __print_flags #undef __print_symbolic +#undef __print_hex #undef __get_dynamic_array #undef __get_str -- cgit v1.1