perf symbols: Move idle syms check from top to generic function

Allows list of idle symbols to be leveraged by other commands, such as
the upcoming timehist command.

Signed-off-by: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1384806771-2945-3-git-send-email-dsahern@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

3 files changed, 33 insertions, 23 deletions

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 531522d3d97b..03d37a76c612 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -634,26 +634,9 @@ repeat:
         return NULL;
 }
 
-/* Tag samples to be skipped. */
-static const char *skip_symbols[] = {
-        "intel_idle",
-        "default_idle",
-        "native_safe_halt",
-        "cpu_idle",
-        "enter_idle",
-        "exit_idle",
-        "mwait_idle",
-        "mwait_idle_with_hints",
-        "poll_idle",
-        "ppc64_runlatch_off",
-        "pseries_dedicated_idle_sleep",
-        NULL
-};
-
 static int symbol_filter(struct map *map __maybe_unused, struct symbol *sym)
 {
         const char *name = sym->name;
-        int i;
 
         /*
          * ppc64 uses function descriptors and appends a '.' to the
@@ -671,12 +654,8 @@ static int symbol_filter(struct map *map __maybe_unused, struct symbol *sym)
             strstr(name, "_text_end"))
                 return 1;
 
-        for (i = 0; skip_symbols[i]; i++) {
-                if (!strcmp(skip_symbols[i], name)) {
-                        sym->ignore = true;
-                        break;
-                }
-        }
+        if (symbol__is_idle(sym))
+                sym->ignore = true;
 
         return 0;
 }
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index c0c36965fff0..f55c18da1e40 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -573,6 +573,36 @@ static u8 kallsyms2elf_type(char type)
         return isupper(type) ? STB_GLOBAL : STB_LOCAL;
 }
 
+bool symbol__is_idle(struct symbol *sym)
+{
+        const char * const idle_symbols[] = {
+                "cpu_idle",
+                "intel_idle",
+                "default_idle",
+                "native_safe_halt",
+                "enter_idle",
+                "exit_idle",
+                "mwait_idle",
+                "mwait_idle_with_hints",
+                "poll_idle",
+                "ppc64_runlatch_off",
+                "pseries_dedicated_idle_sleep",
+                NULL
+        };
+
+        int i;
+
+        if (!sym)
+                return false;
+
+        for (i = 0; idle_symbols[i]; i++) {
+                if (!strcmp(idle_symbols[i], sym->name))
+                        return true;
+        }
+
+        return false;
+}
+
 static int map__process_kallsym_symbol(void *arg, const char *name,
                                        char type, u64 start)
 {
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index 07de8fea2f48..ad13c5d50b91 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -240,6 +240,7 @@ size_t symbol__fprintf(struct symbol *sym, FILE *fp);
 bool symbol_type__is_a(char symbol_type, enum map_type map_type);
 bool symbol__restricted_filename(const char *filename,
                                  const char *restricted_filename);
+bool symbol__is_idle(struct symbol *sym);
 
 int dso__load_sym(struct dso *dso, struct map *map, struct symsrc *syms_ss,
                   struct symsrc *runtime_ss, symbol_filter_t filter,