Messages in this thread | | | Date | Sat, 23 Nov 2013 03:59:23 -0500 | From | Steven Rostedt <> | Subject | Re: [PATCH 05/22] tools lib traceevent: Add hrtimer plugin |
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On Fri, 22 Nov 2013 23:33:29 +0900 Namhyung Kim <namhyung@kernel.org> wrote:
> 2013-11-21 (목), 12:01 +0100, Jiri Olsa: > > Backporting hrtimer plugin. > > > > Backported from Steven Rostedt's trace-cmd repo (HEAD 0f2c2fb): > > git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/trace-cmd.git > > > > This plugin adds function field resolving for following > > tracepoint events: > > timer:hrtimer_expire_entry > > timer:hrtimer_start > > > > The diff of 'perf script' output generated by old and new code: > > (data was generated by 'perf record -e 'timer:hrtimer*' -a') > > > > --- script.hrtimer.old > > +++ script.hrtimer.new > > - swapper 0 [000] 27405.519092: timer:hrtimer_start: [FAILED TO PARSE] hrtimer=0xffff88021e20e800 function=0xffffffff810c0e10 expires=27398383000000 softexpires=27398383000000 > > + swapper 0 [000] 27405.519103: timer:hrtimer_start: hrtimer=0xffff88021e20e800 function=tick_sched_timer expires=27398383000000 softexpires=27398383000000 > > - swapper 0 [001] 27405.519544: timer:hrtimer_expire_entry: [FAILED TO PARSE] hrtimer=0xffff880211334058 now=27398294182491 function=0xffffffff81086f20 > > + swapper 0 [001] 27405.519544: timer:hrtimer_expire_entry: hrtimer=0xffff880211334058 now=27398294182491 function=posix_timer_fn/0x0 > > > > Check the 'function' field is translated into the function name. > > [SNIP] > > + if (!fn) { > > + trace_seq_printf(s, " function=MISSING"); > > + } else { > > + unsigned long long function; > > + const char *func; > > + > > + if (pevent_read_number_field(fn, data, &function)) > > + trace_seq_printf(s, " function=INVALID"); > > + > > + func = pevent_find_function(pevent, function); > > + > > + trace_seq_printf(s, " function=%s", func); > > Shouldn't it be like below? > > if (pevent_read_number_field(fn, data, &function)) > trace_seq_printf(s, " function=INVALID"); > else { > func = pevent_find_function(pevent, function); > trace_seq_printf(s, " function=%s", func); > } > > Otherwise it'll print "function=XXX" twice if pevent_read_number_field() > failed. >
Nice catch, but lets keep the backport and fixes separate.
Actually, this was one of the first plugins I wrote, and since then, I added a function tat does this for you. The proper change is to rip this out and use:
pevent_print_func_field()
instead. That function does the checks properly.
-- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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