perf probe: Expand given path to absolute path
Expand given path to absolute path in the option parser, except for a
module name.
Since realpath at later stage in processing several probe point, can be
called several times (even if currently doesn't, it can happen when we
expands the feature), it is waste of the performance.
Processing it once at the early stage can avoid that.
Changes from previous one:
- Fix not to print null string.
- Allocate memory for given path/module name everytime.
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: "David A. Long" <dave.long@linaro.org>
Cc: "Steven Rostedt (Red Hat)" <rostedt@goodmis.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: systemtap@sourceware.org
Cc: yrl.pp-manager.tt@hitachi.com
Link: http://lkml.kernel.org/r/20131226054150.22364.12187.stgit@kbuild-fedora.novalocal
[ Clarified the pr_warning message as per David Ahern's suggestion ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index c98ccb5..1792a3f 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -169,6 +169,7 @@
int unset __maybe_unused)
{
int ret = -ENOENT;
+ char *tmp;
if (str && !params.target) {
if (!strcmp(opt->long_name, "exec"))
@@ -180,7 +181,19 @@
else
return ret;
- params.target = str;
+ /* Expand given path to absolute path, except for modulename */
+ if (params.uprobes || strchr(str, '/')) {
+ tmp = realpath(str, NULL);
+ if (!tmp) {
+ pr_warning("Failed to get the absolute path of %s: %m\n", str);
+ return ret;
+ }
+ } else {
+ tmp = strdup(str);
+ if (!tmp)
+ return -ENOMEM;
+ }
+ params.target = tmp;
ret = 0;
}