perf tools: Add --buildid-dir option to set cache directory

Adding --buildid-dir to be able to set specific cache directory. It's
going to be handy for buildid tests coming in shortly.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1417460789-13874-4-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

4 files changed, 22 insertions, 6 deletions

diff --git a/tools/perf/Documentation/perf.txt b/tools/perf/Documentation/perf.txt
index d240bb2e5b22..1e8e400b4493 100644
--- a/tools/perf/Documentation/perf.txt
+++ b/tools/perf/Documentation/perf.txt
@@ -18,6 +18,10 @@ OPTIONS
           --debug verbose   # sets verbose = 1
           --debug verbose=2 # sets verbose = 2
 
+--buildid-dir::
+        Setup buildid cache directory. It has higher priority than
+        buildid.dir config file option.
+
 DESCRIPTION
 -----------
 Performance counters for Linux are a new kernel-based subsystem
diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index 452a8474d29d..3700a7faca6c 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -200,6 +200,16 @@ static int handle_options(const char ***argv, int *argc, int *envchanged)
                                 *envchanged = 1;
                         (*argv)++;
                         (*argc)--;
+                } else if (!strcmp(cmd, "--buildid-dir")) {
+                        if (*argc < 2) {
+                                fprintf(stderr, "No directory given for --buildid-dir.\n");
+                                usage(perf_usage_string);
+                        }
+                        set_buildid_dir((*argv)[1]);
+                        if (envchanged)
+                                *envchanged = 1;
+                        (*argv)++;
+                        (*argc)--;
                 } else if (!prefixcmp(cmd, CMD_DEBUGFS_DIR)) {
                         perf_debugfs_set_path(cmd + strlen(CMD_DEBUGFS_DIR));
                         fprintf(stderr, "dir: %s\n", debugfs_mountpoint);
@@ -499,7 +509,7 @@ int main(int argc, const char **argv)
         }
         if (!prefixcmp(cmd, "trace")) {
 #ifdef HAVE_LIBAUDIT_SUPPORT
-                set_buildid_dir();
+                set_buildid_dir(NULL);
                 setup_path();
                 argv[0] = "trace";
                 return cmd_trace(argc, argv, NULL);
@@ -514,7 +524,7 @@ int main(int argc, const char **argv)
         argc--;
         handle_options(&argv, &argc, NULL);
         commit_pager_choice();
-        set_buildid_dir();
+        set_buildid_dir(NULL);
 
         if (argc > 0) {
                 if (!prefixcmp(argv[0], "--"))
diff --git a/tools/perf/util/config.c b/tools/perf/util/config.c
index c802236b2bfe..e18f653cd7db 100644
--- a/tools/perf/util/config.c
+++ b/tools/perf/util/config.c
@@ -539,12 +539,14 @@ static void check_buildid_dir_config(void)
         perf_config(buildid_dir_command_config, &c);
 }
 
-void set_buildid_dir(void)
+void set_buildid_dir(const char *dir)
 {
-        buildid_dir[0] = '\0';
+        if (dir)
+                scnprintf(buildid_dir, MAXPATHLEN-1, "%s", dir);
 
         /* try config file */
-        check_buildid_dir_config();
+        if (buildid_dir[0] == '\0')
+                check_buildid_dir_config();
 
         /* default to $HOME/.debug */
         if (buildid_dir[0] == '\0') {
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index 419bee030f83..abc445ee4f60 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -153,7 +153,7 @@ extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)))
 extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
 
 extern int prefixcmp(const char *str, const char *prefix);
-extern void set_buildid_dir(void);
+extern void set_buildid_dir(const char *dir);
 
 static inline const char *skip_prefix(const char *str, const char *prefix)
 {