perf list: Show SDT and pre-cached events

Show SDT and pre-cached events by perf-list with "sdt". This also shows
the binary and build-id where the events are placed only when there are
same name events on different binaries.

e.g.:

  # perf list sdt

  List of pre-defined events (to be used in -e):

    sdt_libc:lll_futex_wake                            [SDT event]
    sdt_libc:lll_lock_wait_private                     [SDT event]
    sdt_libc:longjmp                                   [SDT event]
    sdt_libc:longjmp_target                            [SDT event]
  ...
    sdt_libstdcxx:rethrow@/usr/bin/gcc(0cc207fc4b27)   [SDT event]
    sdt_libstdcxx:rethrow@/usr/lib64/libstdc++.so.6.0.20(91c7a88fdf49)
    sdt_libstdcxx:throw@/usr/bin/gcc(0cc207fc4b27)     [SDT event]
    sdt_libstdcxx:throw@/usr/lib64/libstdc++.so.6.0.20(91c7a88fdf49)

The binary path and build-id are shown in below format;

  <GROUP>:<EVENT>@<PATH>(<BUILD-ID>)

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Hemant Kumar <hemant@linux.vnet.ibm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20160624090646.25421.44225.stgit@devbox
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

4 files changed, 98 insertions, 1 deletions

diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c
index 5e22db4684b8..88ee419e5189 100644
--- a/tools/perf/builtin-list.c
+++ b/tools/perf/builtin-list.c
@@ -25,7 +25,7 @@ int cmd_list(int argc, const char **argv, const char *prefix __maybe_unused)
                 OPT_END()
         };
         const char * const list_usage[] = {
-                "perf list [hw|sw|cache|tracepoint|pmu|event_glob]",
+                "perf list [hw|sw|cache|tracepoint|pmu|sdt|event_glob]",
                 NULL
         };
 
@@ -62,6 +62,8 @@ int cmd_list(int argc, const char **argv, const char *prefix __maybe_unused)
                         print_hwcache_events(NULL, raw_dump);
                 else if (strcmp(argv[i], "pmu") == 0)
                         print_pmu_events(NULL, raw_dump);
+                else if (strcmp(argv[i], "sdt") == 0)
+                        print_sdt_events(NULL, NULL, raw_dump);
                 else if ((sep = strchr(argv[i], ':')) != NULL) {
                         int sep_idx;
 
@@ -76,6 +78,7 @@ int cmd_list(int argc, const char **argv, const char *prefix __maybe_unused)
 
                         s[sep_idx] = '\0';
                         print_tracepoint_events(s, s + sep_idx + 1, raw_dump);
+                        print_sdt_events(s, s + sep_idx + 1, raw_dump);
                         free(s);
                 } else {
                         if (asprintf(&s, "*%s*", argv[i]) < 0) {
@@ -89,6 +92,7 @@ int cmd_list(int argc, const char **argv, const char *prefix __maybe_unused)
                         print_hwcache_events(s, raw_dump);
                         print_pmu_events(s, raw_dump);
                         print_tracepoint_events(NULL, s, raw_dump);
+                        print_sdt_events(NULL, s, raw_dump);
                         free(s);
                 }
         }
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 6b4fff375d99..375af0e02831 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -20,6 +20,7 @@
 #include "pmu.h"
 #include "thread_map.h"
 #include "cpumap.h"
+#include "probe-file.h"
 #include "asm/bug.h"
 
 #define MAX_NAME_LEN 100
@@ -1984,6 +1985,85 @@ static bool is_event_supported(u8 type, unsigned config)
         return ret;
 }
 
+void print_sdt_events(const char *subsys_glob, const char *event_glob,
+                      bool name_only)
+{
+        struct probe_cache *pcache;
+        struct probe_cache_entry *ent;
+        struct strlist *bidlist, *sdtlist;
+        struct strlist_config cfg = {.dont_dupstr = true};
+        struct str_node *nd, *nd2;
+        char *buf, *path, *ptr = NULL;
+        bool show_detail = false;
+        int ret;
+
+        sdtlist = strlist__new(NULL, &cfg);
+        if (!sdtlist) {
+                pr_debug("Failed to allocate new strlist for SDT\n");
+                return;
+        }
+        bidlist = build_id_cache__list_all(true);
+        if (!bidlist) {
+                pr_debug("Failed to get buildids: %d\n", errno);
+                return;
+        }
+        strlist__for_each_entry(nd, bidlist) {
+                pcache = probe_cache__new(nd->s);
+                if (!pcache)
+                        continue;
+                list_for_each_entry(ent, &pcache->entries, node) {
+                        if (!ent->sdt)
+                                continue;
+                        if (subsys_glob &&
+                            !strglobmatch(ent->pev.group, subsys_glob))
+                                continue;
+                        if (event_glob &&
+                            !strglobmatch(ent->pev.event, event_glob))
+                                continue;
+                        ret = asprintf(&buf, "%s:%s@%s", ent->pev.group,
+                                        ent->pev.event, nd->s);
+                        if (ret > 0)
+                                strlist__add(sdtlist, buf);
+                }
+                probe_cache__delete(pcache);
+        }
+        strlist__delete(bidlist);
+
+        strlist__for_each_entry(nd, sdtlist) {
+                buf = strchr(nd->s, '@');
+                if (buf)
+                        *(buf++) = '\0';
+                if (name_only) {
+                        printf("%s ", nd->s);
+                        continue;
+                }
+                nd2 = strlist__next(nd);
+                if (nd2) {
+                        ptr = strchr(nd2->s, '@');
+                        if (ptr)
+                                *ptr = '\0';
+                        if (strcmp(nd->s, nd2->s) == 0)
+                                show_detail = true;
+                }
+                if (show_detail) {
+                        path = build_id_cache__origname(buf);
+                        ret = asprintf(&buf, "%s@%s(%.12s)", nd->s, path, buf);
+                        if (ret > 0) {
+                                printf("  %-50s [%s]\n", buf, "SDT event");
+                                free(buf);
+                        }
+                } else
+                        printf("  %-50s [%s]\n", nd->s, "SDT event");
+                if (nd2) {
+                        if (strcmp(nd->s, nd2->s) != 0)
+                                show_detail = false;
+                        if (ptr)
+                                *ptr = '@';
+                }
+        }
+        strlist__delete(sdtlist);
+}
+
 int print_hwcache_events(const char *event_glob, bool name_only)
 {
         unsigned int type, op, i, evt_i = 0, evt_num = 0;
@@ -2166,6 +2246,8 @@ void print_events(const char *event_glob, bool name_only)
         }
 
         print_tracepoint_events(NULL, NULL, name_only);
+
+        print_sdt_events(NULL, NULL, name_only);
 }
 
 int parse_events__is_hardcoded_term(struct parse_events_term *term)
diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
index 0bd664dfa53c..b4aa7eb2df73 100644
--- a/tools/perf/util/parse-events.h
+++ b/tools/perf/util/parse-events.h
@@ -183,6 +183,8 @@ void print_symbol_events(const char *event_glob, unsigned type,
 void print_tracepoint_events(const char *subsys_glob, const char *event_glob,
                              bool name_only);
 int print_hwcache_events(const char *event_glob, bool name_only);
+void print_sdt_events(const char *subsys_glob, const char *event_glob,
+                      bool name_only);
 int is_valid_tracepoint(const char *event_string);
 
 int valid_event_mount(const char *eventfs);
diff --git a/tools/perf/util/probe-file.h b/tools/perf/util/probe-file.h
index cafbe1d3f3bf..9577b5c0b487 100644
--- a/tools/perf/util/probe-file.h
+++ b/tools/perf/util/probe-file.h
@@ -24,6 +24,8 @@ struct probe_cache {
 #define for_each_probe_cache_entry(entry, pcache) \
         list_for_each_entry(entry, &pcache->entries, node)
 
+/* probe-file.c depends on libelf */
+#ifdef HAVE_LIBELF_SUPPORT
 int probe_file__open(int flag);
 int probe_file__open_both(int *kfd, int *ufd, int flag);
 struct strlist *probe_file__get_namelist(int fd);
@@ -52,4 +54,11 @@ struct probe_cache_entry *probe_cache__find(struct probe_cache *pcache,
 struct probe_cache_entry *probe_cache__find_by_name(struct probe_cache *pcache,
                                         const char *group, const char *event);
 int probe_cache__show_all_caches(struct strfilter *filter);
+#else   /* ! HAVE_LIBELF_SUPPORT */
+static inline struct probe_cache *probe_cache__new(const char *tgt __maybe_unused)
+{
+        return NULL;
+}
+#define probe_cache__delete(pcache) do {} while (0)
+#endif
 #endif