From: Arnaldo Carvalho de Melo <acme@redhat.com>
Subject: perf evlist: Introduce perf_evlist__add_attrs
Date: Fri Nov 4 09:10:59 2011 -0200
Git-commit: 50d08e47bc04eb05502f5c86b70bbd19ef1c2778
Patch-mainline: v3.3-rc1
References: bnc#806964
Signed-off-by: Tony Jones <tonyj@suse.de>

    perf evlist: Introduce perf_evlist__add_attrs
    
    Replacing the open coded equivalents in 'perf stat'.
    
    Cc: David Ahern <dsahern@gmail.com>
    Cc: Frederic Weisbecker <fweisbec@gmail.com>
    Cc: Mike Galbraith <efault@gmx.de>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Stephane Eranian <eranian@google.com>
    Link: http://lkml.kernel.org/n/tip-1btwadnf2tds2g07hsccsdse@git.kernel.org
    Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

---
 tools/perf/builtin-stat.c |   40 +++++++---------------------------------
 tools/perf/util/evlist.c  |   34 ++++++++++++++++++++++++++++++++++
 tools/perf/util/evlist.h  |    7 +++++++
 3 files changed, 48 insertions(+), 33 deletions(-)

--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1069,22 +1069,13 @@ static const struct option options[] = {
  */
 static int add_default_attributes(void)
 {
-	struct perf_evsel *pos;
-	size_t attr_nr = 0;
-	size_t c;
-
 	/* Set attrs if no event is selected and !null_run: */
 	if (null_run)
 		return 0;
 
 	if (!evsel_list->nr_entries) {
-		for (c = 0; c < ARRAY_SIZE(default_attrs); c++) {
-			pos = perf_evsel__new(default_attrs + c, c + attr_nr);
-			if (pos == NULL)
-				return -1;
-			perf_evlist__add(evsel_list, pos);
-		}
-		attr_nr += c;
+		if (perf_evlist__add_attrs_array(evsel_list, default_attrs) < 0)
+			return -1;
 	}
 
 	/* Detailed events get appended to the event list: */
@@ -1093,38 +1084,21 @@ static int add_default_attributes(void)
 		return 0;
 
 	/* Append detailed run extra attributes: */
-	for (c = 0; c < ARRAY_SIZE(detailed_attrs); c++) {
-		pos = perf_evsel__new(detailed_attrs + c, c + attr_nr);
-		if (pos == NULL)
-			return -1;
-		perf_evlist__add(evsel_list, pos);
-	}
-	attr_nr += c;
+	if (perf_evlist__add_attrs_array(evsel_list, detailed_attrs) < 0)
+		return -1;
 
 	if (detailed_run < 2)
 		return 0;
 
 	/* Append very detailed run extra attributes: */
-	for (c = 0; c < ARRAY_SIZE(very_detailed_attrs); c++) {
-		pos = perf_evsel__new(very_detailed_attrs + c, c + attr_nr);
-		if (pos == NULL)
-			return -1;
-		perf_evlist__add(evsel_list, pos);
-	}
+	if (perf_evlist__add_attrs_array(evsel_list, very_detailed_attrs) < 0)
+		return -1;
 
 	if (detailed_run < 3)
 		return 0;
 
 	/* Append very, very detailed run extra attributes: */
-	for (c = 0; c < ARRAY_SIZE(very_very_detailed_attrs); c++) {
-		pos = perf_evsel__new(very_very_detailed_attrs + c, c + attr_nr);
-		if (pos == NULL)
-			return -1;
-		perf_evlist__add(evsel_list, pos);
-	}
-
-
-	return 0;
+	return perf_evlist__add_attrs_array(evsel_list, very_very_detailed_attrs);
 }
 
 int cmd_stat(int argc, const char **argv, const char *prefix __used)
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -13,6 +13,8 @@
 #include "evsel.h"
 #include "util.h"
 
+#include "parse-events.h"
+
 #include <sys/mman.h>
 
 #include <linux/bitops.h>
@@ -76,6 +78,14 @@ void perf_evlist__add(struct perf_evlist
 	++evlist->nr_entries;
 }
 
+static void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
+					  struct list_head *list,
+					  int nr_entries)
+{
+	list_splice_tail(list, &evlist->entries);
+	evlist->nr_entries += nr_entries;
+}
+
 int perf_evlist__add_default(struct perf_evlist *evlist)
 {
 	struct perf_event_attr attr = {
@@ -91,6 +101,30 @@ int perf_evlist__add_default(struct perf
 	return 0;
 }
 
+int perf_evlist__add_attrs(struct perf_evlist *evlist,
+			   struct perf_event_attr *attrs, size_t nr_attrs)
+{
+	struct perf_evsel *evsel, *n;
+	LIST_HEAD(head);
+	size_t i;
+
+	for (i = 0; i < nr_attrs; i++) {
+		evsel = perf_evsel__new(attrs + i, evlist->nr_entries + i);
+		if (evsel == NULL)
+			goto out_delete_partial_list;
+		list_add_tail(&evsel->node, &head);
+	}
+
+	perf_evlist__splice_list_tail(evlist, &head, nr_attrs);
+
+	return 0;
+
+out_delete_partial_list:
+	list_for_each_entry_safe(evsel, n, &head, node)
+		perf_evsel__delete(evsel);
+	return -1;
+}
+
 int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
 {
 	int nfds = evlist->cpus->nr * evlist->threads->nr * evlist->nr_entries;
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -2,8 +2,10 @@
 #define __PERF_EVLIST_H 1
 
 #include <linux/list.h>
+#include <stdio.h>
 #include "../perf.h"
 #include "event.h"
+#include "util.h"
 
 struct pollfd;
 struct thread_map;
@@ -38,6 +40,11 @@ void perf_evlist__delete(struct perf_evl
 
 void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry);
 int perf_evlist__add_default(struct perf_evlist *evlist);
+int perf_evlist__add_attrs(struct perf_evlist *evlist,
+			   struct perf_event_attr *attrs, size_t nr_attrs);
+
+#define perf_evlist__add_attrs_array(evlist, array) \
+	perf_evlist__add_attrs(evlist, array, ARRAY_SIZE(array))
 
 void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel,
 			 int cpu, int thread, u64 id);
