On Mon, Mar 11, 2019 at 05:33:02PM -0300, Arnaldo Carvalho de Melo wrote: > Em Mon, Mar 11, 2019 at 01:24:42PM -0700, Andi Kleen escreveu: > > From: Andi Kleen <[email protected]> > > > > The message about missing /tmp/perf-* for JITed code is quite confusing > > to users. Add a better error message, but only print it once. > > > > Signed-off-by: Andi Kleen <[email protected]> > > --- > > tools/perf/util/map.c | 9 +++++++++ > > 1 file changed, 9 insertions(+) > > > > diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c > > index fbeb0c6efaa6..d476b76abc6a 100644 > > --- a/tools/perf/util/map.c > > +++ b/tools/perf/util/map.c > > @@ -316,6 +316,15 @@ int map__load(struct map *map) > > > > nr = dso__load(map->dso, map); > > if (nr < 0) { > > + if (!strncmp(map->dso->name, "/tmp/perf-", 10)) { > > + static bool warned; > > + if (!warned) { > > + pr_err("Cannot find executable, JITed code > > present? May need agent.\n"); > > + warned = true; > > + } > > Please use WARN_ON_ONCE(), we have it in tools/include/asm/bug.h, just > like the kernel.
But that prints "assertation failed". This is not a perf bug, but can happen in normal operation. -Andi
