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authorMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>2015-04-01 19:25:42 +0900
committerArnaldo Carvalho de Melo <acme@redhat.com>2015-04-10 10:21:30 -0300
commit8cb0aa4c2db395b143cd5165586dc17677960002 (patch)
treefc15a499e0f56b1ef24436d247f3b04c2128e57d /tools
parent7afb3fab390871b1d20b1dbb94e03b8a3861cb0d (diff)
perf probe: Check the orphaned -x option
To avoid probing in unintended binary, the orphaned -x option must be checked and warned. Without this patch, following command sets up the probe in the kernel. ----- # perf probe -a strcpy -x ./perf Added new event: probe:strcpy (on strcpy) You can now use it in all perf tools, such as: perf record -e probe:strcpy -aR sleep 1 ----- But in this case, it seems that the user may want to probe in the perf binary. With this patch, perf-probe correctly handles the orphaned -x. ----- # perf probe -a strcpy -x ./perf Error: -x/-m must follow the probe definitions. ... ----- Reported-by: Jiri Olsa <jolsa@redhat.com> Acked-by: Jiri Olsa <jolsa@redhat.com> Cc: David Ahern <dsahern@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20150401102541.17137.75477.stgit@localhost.localdomain Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/builtin-probe.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 2df23e177da5..f7b1af67e9f6 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -56,6 +56,7 @@ static struct {
bool mod_events;
bool uprobes;
bool quiet;
+ bool target_used;
int nevents;
struct perf_probe_event events[MAX_PROBES];
struct strlist *dellist;
@@ -82,6 +83,7 @@ static int parse_probe_event(const char *str)
pev->target = strdup(params.target);
if (!pev->target)
return -ENOMEM;
+ params.target_used = true;
}
/* Parse a perf-probe command into event */
@@ -107,6 +109,7 @@ static int set_target(const char *ptr)
params.target = strdup(ptr);
if (!params.target)
return -ENOMEM;
+ params.target_used = false;
found = 1;
buf = ptr + (strlen(ptr) - 3);
@@ -207,6 +210,7 @@ static int opt_set_target(const struct option *opt, const char *str,
}
free(params.target);
params.target = tmp;
+ params.target_used = false;
ret = 0;
}
@@ -491,6 +495,12 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
}
if (params.nevents) {
+ /* Ensure the last given target is used */
+ if (params.target && !params.target_used) {
+ pr_warning(" Error: -x/-m must follow the probe definitions.\n");
+ usage_with_options(probe_usage, options);
+ }
+
ret = add_perf_probe_events(params.events, params.nevents,
params.max_probe_points,
params.force_add);

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