Em Wed, Aug 07, 2019 at 10:44:17AM -0400, Igor Lubashev escreveu: > Kernel requires CAP_SYS_ADMIN instead of euid==0 to mount debugfs for ftrace. > Make perf do the same. > > Signed-off-by: Igor Lubashev <[email protected]> > --- > tools/perf/builtin-ftrace.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c > index ae1466aa3b26..d09eac8a6d57 100644 > --- a/tools/perf/builtin-ftrace.c > +++ b/tools/perf/builtin-ftrace.c > @@ -13,6 +13,7 @@ > #include <signal.h> > #include <fcntl.h> > #include <poll.h> > +#include <linux/capability.h> > > #include "debug.h" > #include <subcmd/parse-options.h> > @@ -21,6 +22,7 @@ > #include "target.h" > #include "cpumap.h" > #include "thread_map.h" > +#include "util/cap.h" > #include "util/config.h" > > > @@ -281,7 +283,7 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int > argc, const char **argv) > .events = POLLIN, > }; > > - if (geteuid() != 0) { > + if (!perf_cap__capable(CAP_SYS_ADMIN)) { > pr_err("ftrace only works for root!\n");
I guess we should update the error message too? > return -1; > } > -- > 2.7.4 -- - Arnaldo
