1 files changed, 21 insertions, 26 deletions

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 5970723cd55a..c3f95440e99c 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -34,6 +34,7 @@
 #include "util/thread.h"
 #include "util/thread_map.h"
 #include "util/top.h"
+#include "util/util.h"
 #include <linux/rbtree.h>
 #include <subcmd/parse-options.h>
 #include "util/parse-events.h"
@@ -264,13 +265,29 @@ out_unlock:
 	pthread_mutex_unlock(&notes->lock);
 }
 
-static void evlist__resort_hists(struct evlist *evlist)
+static void perf_top__resort_hists(struct perf_top *t)
 {
+	struct evlist *evlist = t->evlist;
 	struct evsel *pos;
 
 	evlist__for_each_entry(evlist, pos) {
 		struct hists *hists = evsel__hists(pos);
 
+		/*
+		 * unlink existing entries so that they can be linked
+		 * in a correct order in hists__match() below.
+		 */
+		hists__unlink(hists);
+
+		if (evlist->enabled) {
+			if (t->zero) {
+				hists__delete_entries(hists);
+			} else {
+				hists__decay_entries(hists, t->hide_user_symbols,
+						     t->hide_kernel_symbols);
+			}
+		}
+
 		hists__collapse_resort(hists, NULL);
 
 		/* Non-group events are considered as leader */
@@ -319,16 +336,7 @@ static void perf_top__print_sym_table(struct perf_top *top)
 		return;
 	}
 
-	if (top->evlist->enabled) {
-		if (top->zero) {
-			hists__delete_entries(hists);
-		} else {
-			hists__decay_entries(hists, top->hide_user_symbols,
-					     top->hide_kernel_symbols);
-		}
-	}
-
-	evlist__resort_hists(top->evlist);
+	perf_top__resort_hists(top);
 
 	hists__output_recalc_col_len(hists, top->print_entries - printed);
 	putchar('\n');
@@ -576,24 +584,11 @@ static bool perf_top__handle_keypress(struct perf_top *top, int c)
 static void perf_top__sort_new_samples(void *arg)
 {
 	struct perf_top *t = arg;
-	struct evsel *evsel = t->sym_evsel;
-	struct hists *hists;
 
 	if (t->evlist->selected != NULL)
 		t->sym_evsel = t->evlist->selected;
 
-	hists = evsel__hists(evsel);
-
-	if (t->evlist->enabled) {
-		if (t->zero) {
-			hists__delete_entries(hists);
-		} else {
-			hists__decay_entries(hists, t->hide_user_symbols,
-					     t->hide_kernel_symbols);
-		}
-	}
-
-	evlist__resort_hists(t->evlist);
+	perf_top__resort_hists(t);
 
 	if (t->lost || t->drop)
 		pr_warning("Too slow to read ring buffer (change period (-c/-F) or limit CPUs (-C)\n");
@@ -770,7 +765,7 @@ static void perf_event__process_sample(struct perf_tool *tool,
 		if (!perf_evlist__exclude_kernel(top->session->evlist)) {
 			ui__warning(
 "Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
-"Check /proc/sys/kernel/kptr_restrict.\n\n"
+"Check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n"
 "Kernel%s samples will not be resolved.\n",
 			  al.map && map__has_symbols(al.map) ?
 			  " modules" : "");