Merge branch 'perf/core' of git://github.com/acmel/linux into perf/core

tools/perf/builtin-top.c

@@ -304,7 +304,7 @@ static void print_sym_table(void)
 
 	hists__collapse_resort_threaded(&top.sym_evsel->hists);
 	hists__output_resort_threaded(&top.sym_evsel->hists);
-	hists__decay_entries(&top.sym_evsel->hists);
+	hists__decay_entries_threaded(&top.sym_evsel->hists);
 	hists__output_recalc_col_len(&top.sym_evsel->hists, winsize.ws_row - 3);
 	putchar('\n');
 	hists__fprintf(&top.sym_evsel->hists, NULL, false, false,
@@ -555,7 +555,7 @@ static void perf_top__sort_new_samples(void *arg)
 
 	hists__collapse_resort_threaded(&t->sym_evsel->hists);
 	hists__output_resort_threaded(&t->sym_evsel->hists);
-	hists__decay_entries(&t->sym_evsel->hists);
+	hists__decay_entries_threaded(&t->sym_evsel->hists);
 	hists__output_recalc_col_len(&t->sym_evsel->hists, winsize.ws_row - 3);
 }
 
@@ -585,16 +585,31 @@ static void *display_thread(void *arg __used)
 	tc.c_cc[VMIN] = 0;
 	tc.c_cc[VTIME] = 0;
 
+	pthread__unblock_sigwinch();
 repeat:
 	delay_msecs = top.delay_secs * 1000;
 	tcsetattr(0, TCSANOW, &tc);
 	/* trash return*/
 	getc(stdin);
 
-	do {
+	while (1) {
 		print_sym_table();
-	} while (!poll(&stdin_poll, 1, delay_msecs) == 1);
-
+		/*
+		 * Either timeout expired or we got an EINTR due to SIGWINCH,
+		 * refresh screen in both cases.
+		 */
+		switch (poll(&stdin_poll, 1, delay_msecs)) {
+		case 0:
+			continue;
+		case -1:
+			if (errno == EINTR)
+				continue;
+			/* Fall trhu */
+		default:
+			goto process_hotkey;
+		}
+	}
+process_hotkey:
 	c = getc(stdin);
 	tcsetattr(0, TCSAFLUSH, &save);
 

tools/perf/perf.c

@@ -427,6 +427,24 @@ static void get_debugfs_mntpt(void)
 		debugfs_mntpt[0] = '\0';
 }
 
+static void pthread__block_sigwinch(void)
+{
+	sigset_t set;
+
+	sigemptyset(&set);
+	sigaddset(&set, SIGWINCH);
+	pthread_sigmask(SIG_BLOCK, &set, NULL);
+}
+
+void pthread__unblock_sigwinch(void)
+{
+	sigset_t set;
+
+	sigemptyset(&set);
+	sigaddset(&set, SIGWINCH);
+	pthread_sigmask(SIG_UNBLOCK, &set, NULL);
+}
+
 int main(int argc, const char **argv)
 {
 	const char *cmd;
@@ -480,6 +498,12 @@ int main(int argc, const char **argv)
 	 * time.
 	 */
 	setup_path();
+	/*
+	 * Block SIGWINCH notifications so that the thread that wants it can
+	 * unblock and get syscalls like select interrupted instead of waiting
+	 * forever while the signal goes to some other non interested thread.
+	 */
+	pthread__block_sigwinch();
 
 	while (1) {
 		static int done_help;

tools/perf/perf.h

@@ -183,4 +183,6 @@ struct ip_callchain {
 extern bool perf_host, perf_guest;
 extern const char perf_version_string[];
 
+void pthread__unblock_sigwinch(void);
+
 #endif

tools/perf/util/header.c

@@ -1289,7 +1289,7 @@ int build_id_cache__remove_s(const char *sbuild_id, const char *debugdir)
 	if (access(linkname, F_OK))
 		goto out_free;
 
-	if (readlink(linkname, filename, size) < 0)
+	if (readlink(linkname, filename, size - 1) < 0)
 		goto out_free;
 
 	if (unlink(linkname))

tools/perf/util/hist.c

@@ -100,25 +100,31 @@ static void hist_entry__decay(struct hist_entry *he)
 
 static bool hists__decay_entry(struct hists *hists, struct hist_entry *he)
 {
+	if (he->period == 0)
+		return true;
 	hists->stats.total_period -= he->period;
 	hist_entry__decay(he);
 	hists->stats.total_period += he->period;
 	return he->period == 0;
 }
 
-void hists__decay_entries(struct hists *hists)
+static void __hists__decay_entries(struct hists *hists, bool threaded)
 {
 	struct rb_node *next = rb_first(&hists->entries);
 	struct hist_entry *n;
 
 	while (next) {
 		n = rb_entry(next, struct hist_entry, rb_node);
 		next = rb_next(&n->rb_node);
-
-		if (hists__decay_entry(hists, n)) {
+		/*
+		 * We may be annotating this, for instance, so keep it here in
+		 * case some it gets new samples, we'll eventually free it when
+		 * the user stops browsing and it agains gets fully decayed.
+		 */
+		if (hists__decay_entry(hists, n) && !n->used) {
 			rb_erase(&n->rb_node, &hists->entries);
 
-			if (sort__need_collapse)
+			if (sort__need_collapse || threaded)
 				rb_erase(&n->rb_node_in, &hists->entries_collapsed);
 
 			hist_entry__free(n);
@@ -127,6 +133,16 @@ void hists__decay_entries(struct hists *hists)
 	}
 }
 
+void hists__decay_entries(struct hists *hists)
+{
+	return __hists__decay_entries(hists, false);
+}
+
+void hists__decay_entries_threaded(struct hists *hists)
+{
+	return __hists__decay_entries(hists, true);
+}
+
 /*
  * histogram, sorted on item, collects periods
  */

tools/perf/util/hist.h

@@ -79,6 +79,7 @@ void hists__collapse_resort(struct hists *self);
 void hists__collapse_resort_threaded(struct hists *hists);
 
 void hists__decay_entries(struct hists *hists);
+void hists__decay_entries_threaded(struct hists *hists);
 void hists__output_recalc_col_len(struct hists *hists, int max_rows);
 
 void hists__inc_nr_events(struct hists *self, u32 type);
@@ -103,16 +104,20 @@ struct perf_evlist;
 #ifdef NO_NEWT_SUPPORT
 static inline
 int perf_evlist__tui_browse_hists(struct perf_evlist *evlist __used,
-				  const char *help __used, void(*timer)(void *arg) __used, void *arg,
+				  const char *help __used,
+				  void(*timer)(void *arg) __used,
+				  void *arg __used,
 				  int refresh __used)
 {
 	return 0;
 }
 
 static inline int hist_entry__tui_annotate(struct hist_entry *self __used,
-					   int evidx __used, int nr_events __used,
+					   int evidx __used,
+					   int nr_events __used,
 					   void(*timer)(void *arg) __used,
-					   void *arg __used, int delay_secs __used);
+					   void *arg __used,
+					   int delay_secs __used)
 {
 	return 0;
 }

tools/perf/util/sort.h

@@ -64,6 +64,7 @@ struct hist_entry {
 
 	bool			init_have_children;
 	char			level;
+	bool			used;
 	u8			filtered;
 	struct symbol		*parent;
 	union {