perf probe: Do not use map_load filters for function

It is simpler to just do the loop, no need for globals and the last user
of such facility disappears.

Testing:

  # perf probe -F [a-z]*recvmsg
  aead_recvmsg
  compat_SyS_recvmsg
  compat_sys_recvmsg
  hash_recvmsg
  inet_recvmsg
  kernel_recvmsg
  netlink_recvmsg
  packet_recvmsg
  ping_recvmsg
  raw_recvmsg
  rawv6_recvmsg
  rng_recvmsg
  security_socket_recvmsg
  selinux_socket_recvmsg
  skcipher_recvmsg
  sock_common_recvmsg
  sock_no_recvmsg
  sock_recvmsg
  sys_recvmsg
  tcp_recvmsg
  udp_recvmsg
  udpv6_recvmsg
  unix_dgram_recvmsg
  unix_seqpacket_recvmsg
  unix_stream_recvmsg
  #

Without filters:

  # perf probe -F | tail -5
  zswap_pool_create
  zswap_pool_current
  zswap_update_total_size
  zswap_writeback_entry
  zswap_zpool_param_set
  #
  # perf probe -F | wc -l
  33311
  #

Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/20160831130427.GA13095@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 28733962cd80a63e1376b5b71f4771ab8f8857f7..0bed2ee1629259558a83bdc8e6620b9ea253b5f4 100644 (file)
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -3289,24 +3289,10 @@ out:
        return ret;
 }
 
-/* TODO: don't use a global variable for filter ... */
-static struct strfilter *available_func_filter;
-
-/*
- * If a symbol corresponds to a function with global binding and
- * matches filter return 0. For all others return 1.
- */
-static int filter_available_functions(struct map *map __maybe_unused,
-                                     struct symbol *sym)
-{
-       if (strfilter__compare(available_func_filter, sym->name))
-               return 0;
-       return 1;
-}
-
 int show_available_funcs(const char *target, struct strfilter *_filter,
                                        bool user)
 {
+        struct rb_node *nd;
        struct map *map;
        int ret;
 
@@ -3324,9 +3310,7 @@ int show_available_funcs(const char *target, struct strfilter *_filter,
                return -EINVAL;
        }
 
-       /* Load symbols with given filter */
-       available_func_filter = _filter;
-       ret = map__load(map, filter_available_functions);
+       ret = map__load(map, NULL);
        if (ret) {
                if (ret == -2) {
                        char *str = strfilter__string(_filter);
@@ -3343,7 +3327,14 @@ int show_available_funcs(const char *target, struct strfilter *_filter,
 
        /* Show all (filtered) symbols */
        setup_pager();
-       dso__fprintf_symbols_by_name(map->dso, map->type, stdout);
+
+        for (nd = rb_first(&map->dso->symbol_names[map->type]); nd; nd = rb_next(nd)) {
+               struct symbol_name_rb_node *pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
+
+               if (strfilter__compare(_filter, pos->sym.name))
+                       printf("%s\n", pos->sym.name);
+        }
+
 end:
        if (user) {
                map__put(map);