perf buildid-list: Add option to show the running kernel build id

[pandora-kernel.git] / tools / perf / builtin-buildid-list.c

diff --git a/tools/perf/builtin-buildid-list.c b/tools/perf/builtin-buildid-list.c
index 5af32ae..4102ead 100644 (file)
--- a/tools/perf/builtin-buildid-list.c
+++ b/tools/perf/builtin-buildid-list.c
@@ -1,7 +1,8 @@
 /*
  * builtin-buildid-list.c
  *
- * Builtin buildid-list command: list buildids in perf.data
+ * Builtin buildid-list command: list buildids in perf.data or in the running
+ * kernel.
  *
  * Copyright (C) 2009, Red Hat Inc.
  * Copyright (C) 2009, Arnaldo Carvalho de Melo <acme@redhat.com>
@@ -17,6 +18,7 @@
 
 static char const *input_name = "perf.data";
 static bool force;
+static bool show_kernel;
 static bool with_hits;
 
 static const char * const buildid_list_usage[] = {
@@ -29,12 +31,13 @@ static const struct option options[] = {
        OPT_STRING('i', "input", &input_name, "file",
                    "input file name"),
        OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
+       OPT_BOOLEAN('k', "kernel", &show_kernel, "Show current kernel build id"),
        OPT_INCR('v', "verbose", &verbose,
                    "be more verbose"),
        OPT_END()
 };
 
-static int __cmd_buildid_list(void)
+static int perf_session__list_build_ids(void)
 {
        struct perf_session *session;
 
@@ -52,6 +55,30 @@ static int __cmd_buildid_list(void)
        return 0;
 }
 
+static int sysfs__fprintf_build_id(FILE *fp)
+{
+       u8 kallsyms_build_id[BUILD_ID_SIZE];
+       char sbuild_id[BUILD_ID_SIZE * 2 + 1];
+
+       if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
+                                sizeof(kallsyms_build_id)) != 0)
+               return -1;
+
+       build_id__sprintf(kallsyms_build_id, sizeof(kallsyms_build_id),
+                         sbuild_id);
+       fprintf(fp, "%s\n", sbuild_id);
+       return 0;
+}
+
+static int __cmd_buildid_list(void)
+{
+
+       if (show_kernel)
+               return sysfs__fprintf_build_id(stdout);
+
+       return perf_session__list_build_ids();
+}
+
 int cmd_buildid_list(int argc, const char **argv, const char *prefix __used)
 {
        argc = parse_options(argc, argv, options, buildid_list_usage, 0);