perf probe: Detect probe target when m/x options are absent

Options -m and -x explicitly allow tracing of modules / user space
binaries. In absense of these options, check if the first argument can
be used as a target.

perf probe /bin/zsh zfree is equivalent to perf probe -x /bin/zsh zfree.

Suggested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Anton Arapov <anton@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Jim Keniston <jkenisto@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Linux-mm <linux-mm@kvack.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20120416120925.30661.40409.sendpatchset@srdronam.in.ibm.com
Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 46 insertions, 5 deletions

diff --git a/tools/perf/Documentation/perf-probe.txt b/tools/perf/Documentation/perf-probe.txt
index fb673bef4798..b715cb71592b 100644
--- a/tools/perf/Documentation/perf-probe.txt
+++ b/tools/perf/Documentation/perf-probe.txt
@@ -104,6 +104,10 @@ OPTIONS
         Specify path to the executable or shared library file for user
         space tracing. Can also be used with --funcs option.
 
+In absence of -m/-x options, perf probe checks if the first argument after
+the options is an absolute path name. If its an absolute path, perf probe
+uses it as a target module/target user space binary to probe.
+
 PROBE SYNTAX
 ------------
 Probe points are defined by following syntax.
@@ -190,11 +194,11 @@ Delete all probes on schedule().
 
 Add probes at zfree() function on /bin/zsh
 
- ./perf probe -x /bin/zsh zfree
+ ./perf probe -x /bin/zsh zfree or ./perf probe /bin/zsh zfree
 
 Add probes at malloc() function on libc
 
- ./perf probe -x /lib/libc.so.6 malloc
+ ./perf probe -x /lib/libc.so.6 malloc or ./perf probe /lib/libc.so.6 malloc
 
 SEE ALSO
 --------
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index ee3d84a7c895..e215ae61b2ae 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -85,21 +85,58 @@ static int parse_probe_event(const char *str)
         return ret;
 }
 
+static int set_target(const char *ptr)
+{
+        int found = 0;
+        const char *buf;
+
+        /*
+         * The first argument after options can be an absolute path
+         * to an executable / library or kernel module.
+         *
+         * TODO: Support relative path, and $PATH, $LD_LIBRARY_PATH,
+         * short module name.
+         */
+        if (!params.target && ptr && *ptr == '/') {
+                params.target = ptr;
+                found = 1;
+                buf = ptr + (strlen(ptr) - 3);
+
+                if (strcmp(buf, ".ko"))
+                        params.uprobes = true;
+
+        }
+
+        return found;
+}
+
 static int parse_probe_event_argv(int argc, const char **argv)
 {
-        int i, len, ret;
+        int i, len, ret, found_target;
         char *buf;
 
+        found_target = set_target(argv[0]);
+        if (found_target && argc == 1)
+                return 0;
+
         /* Bind up rest arguments */
         len = 0;
-        for (i = 0; i < argc; i++)
+        for (i = 0; i < argc; i++) {
+                if (i == 0 && found_target)
+                        continue;
+
                 len += strlen(argv[i]) + 1;
+        }
         buf = zalloc(len + 1);
         if (buf == NULL)
                 return -ENOMEM;
         len = 0;
-        for (i = 0; i < argc; i++)
+        for (i = 0; i < argc; i++) {
+                if (i == 0 && found_target)
+                        continue;
+
                 len += sprintf(&buf[len], "%s ", argv[i]);
+        }
         params.mod_events = true;
         ret = parse_probe_event(buf);
         free(buf);