[PATCH 1/1 tip] perf top: Move hard coded list to /etc/perfconfig/symbols.skip

[Arnaldo Carvalho de Melo <acme@redhat.com>]

This also paves the way to add more symbol lists to be filtered out,
spinlock anyone?

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/Makefile       |    6 ++++--
 tools/perf/builtin-top.c  |   26 +++++++-------------------
 tools/perf/util/strlist.c |   10 ++++++++--
 3 files changed, 19 insertions(+), 23 deletions(-)

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index a5e9b87..385a1bc 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -193,11 +193,10 @@ template_dir = share/perf-core/templates
 htmldir = share/doc/perf-doc
 ifeq ($(prefix),/usr)
 sysconfdir = /etc
-ETC_PERFCONFIG = $(sysconfdir)/perfconfig
 else
 sysconfdir = $(prefix)/etc
-ETC_PERFCONFIG = etc/perfconfig
 endif
+ETC_PERFCONFIG = $(sysconfdir)/perfconfig
 lib = lib
 # DESTDIR=
 
@@ -596,6 +595,7 @@ PERL_PATH_SQ = $(subst ','\'',$(PERL_PATH))
 LIBS = $(PERFLIBS) $(EXTLIBS)
 
 BASIC_CFLAGS += -DSHA1_HEADER='$(SHA1_HEADER_SQ)' \
+		-DPERF_ETC_PATH='"$(ETC_PERFCONFIG)"' \
 	$(COMPAT_CFLAGS)
 LIB_OBJS += $(COMPAT_OBJS)
 
@@ -804,6 +804,8 @@ export perfexec_instdir
 install: all
 	$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(bindir_SQ)'
 	$(INSTALL) perf$X '$(DESTDIR_SQ)$(bindir_SQ)'
+	$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(ETC_PERFCONFIG_SQ)'
+	$(INSTALL) symbols.skip '$(DESTDIR_SQ)$(ETC_PERFCONFIG_SQ)'
 ifdef BUILT_INS
 	$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(perfexec_instdir_SQ)'
 	$(INSTALL) $(BUILT_INS) '$(DESTDIR_SQ)$(perfexec_instdir_SQ)'
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index f139f1a..628ef29 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -20,6 +20,7 @@
 
 #include "perf.h"
 
+#include "util/strlist.h"
 #include "util/symbol.h"
 #include "util/color.h"
 #include "util/util.h"
@@ -279,24 +280,12 @@ static void *display_thread(void *arg __used)
 }
 
 /* Tag samples to be skipped. */
-static const char *skip_symbols[] = {
-	"default_idle",
-	"cpu_idle",
-	"enter_idle",
-	"exit_idle",
-	"mwait_idle",
-	"mwait_idle_with_hints",
-	"ppc64_runlatch_off",
-	"pseries_dedicated_idle_sleep",
-	NULL
-};
+static struct strlist *skip_symbols;
 
 static int symbol_filter(struct dso *self, struct symbol *sym)
 {
 	static int filter_match;
-	struct sym_entry *syme;
 	const char *name = sym->name;
-	int i;
 
 	/*
 	 * ppc64 uses function descriptors and appends a '.' to the
@@ -314,12 +303,9 @@ static int symbol_filter(struct dso *self, struct symbol *sym)
 	    strstr(name, "_text_end"))
 		return 1;
 
-	syme = dso__sym_priv(self, sym);
-	for (i = 0; skip_symbols[i]; i++) {
-		if (!strcmp(skip_symbols[i], name)) {
-			syme->skip = 1;
-			break;
-		}
+	if (strlist__has_entry(skip_symbols, name)) {
+		struct sym_entry *syme = dso__sym_priv(self, sym);
+		syme->skip = 1;
 	}
 
 	if (filter_match == 1) {
@@ -733,6 +719,8 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
 	if (delay_secs < 1)
 		delay_secs = 1;
 
+	skip_symbols = strlist__new(true, "file://" PERF_ETC_PATH "/symbols.skip");
+
 	parse_symbols();
 
 	/*
diff --git a/tools/perf/util/strlist.c b/tools/perf/util/strlist.c
index 7ad3817..d1d63f7 100644
--- a/tools/perf/util/strlist.c
+++ b/tools/perf/util/strlist.c
@@ -104,8 +104,14 @@ void strlist__remove(struct strlist *self, struct str_node *sn)
 
 bool strlist__has_entry(struct strlist *self, const char *entry)
 {
-	struct rb_node **p = &self->entries.rb_node;
-	struct rb_node *parent = NULL;
+	struct rb_node **p;
+	struct rb_node *parent;
+
+	if (self == NULL)
+		return false;
+
+	p = &self->entries.rb_node;
+	parent = NULL;
 
 	while (*p != NULL) {
 		struct str_node *sn;
-- 
1.6.2.5