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[PATCH -tip v2 1/2] [CLEANUP] perf-probe: Expand given path to absolute path
- From: Masami Hiramatsu <masami dot hiramatsu dot pt at hitachi dot com>
- To: Ingo Molnar <mingo at kernel dot org>, Arnaldo Carvalho de Melo <acme at ghostprotocols dot net>
- Cc: Srikar Dronamraju <srikar at linux dot vnet dot ibm dot com>, David Ahern <dsahern at gmail dot com>, lkml <linux-kernel at vger dot kernel dot org>, "Steven Rostedt (Red Hat)" <rostedt at goodmis dot org>, Oleg Nesterov <oleg at redhat dot com>, "David A. Long" <dave dot long at linaro dot org>, systemtap at sourceware dot org, yrl dot pp-manager dot tt at hitachi dot com, Namhyung Kim <namhyung at kernel dot org>
- Date: Thu, 26 Dec 2013 05:41:50 +0000
- Subject: [PATCH -tip v2 1/2] [CLEANUP] perf-probe: Expand given path to absolute path
- Authentication-results: sourceware.org; auth=none
- References: <20131226054148 dot 22364 dot 25224 dot stgit at kbuild-fedora dot novalocal>
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>
---
tools/perf/builtin-probe.c | 16 +++++++++++++++-
tools/perf/util/probe-event.c | 11 ++---------
2 files changed, 17 insertions(+), 10 deletions(-)
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 6ea9e85..5681266 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -169,6 +169,7 @@ static int opt_set_target(const struct option *opt, const char *str,
int unset __maybe_unused)
{
int ret = -ENOENT;
+ char *tmp;
if (str && !params.target) {
if (!strcmp(opt->long_name, "exec"))
@@ -180,7 +181,20 @@ static int opt_set_target(const struct option *opt, const char *str,
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 find the path of %s.\n",
+ str);
+ return ret;
+ }
+ } else {
+ tmp = strdup(str);
+ if (!tmp)
+ return -ENOMEM;
+ }
+ params.target = tmp;
ret = 0;
}
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index d7cff57..05be5de 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2281,7 +2281,7 @@ static int convert_name_to_addr(struct perf_probe_event *pev, const char *exec)
struct perf_probe_point *pp = &pev->point;
struct symbol *sym;
struct map *map = NULL;
- char *function = NULL, *name = NULL;
+ char *function = NULL;
int ret = -EINVAL;
unsigned long long vaddr = 0;
@@ -2297,12 +2297,7 @@ static int convert_name_to_addr(struct perf_probe_event *pev, const char *exec)
goto out;
}
- name = realpath(exec, NULL);
- if (!name) {
- pr_warning("Cannot find realpath for %s.\n", exec);
- goto out;
- }
- map = dso__new_map(name);
+ map = dso__new_map(exec);
if (!map) {
pr_warning("Cannot find appropriate DSO for %s.\n", exec);
goto out;
@@ -2367,7 +2362,5 @@ out:
}
if (function)
free(function);
- if (name)
- free(name);
return ret;
}