From 4a8ce05083b9c88b94560f400370dbc656893b6e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn-Egil=20Dahlberg?= <egil@erlang.org>
Date: Tue, 3 Jan 2012 11:18:14 +0100
Subject: erts: Do not profile system profiler pid

---
 erts/emulator/beam/erl_trace.c | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

(limited to 'erts/emulator/beam')

diff --git a/erts/emulator/beam/erl_trace.c b/erts/emulator/beam/erl_trace.c
index b487dbf054..70c3e7612f 100644
--- a/erts/emulator/beam/erl_trace.c
+++ b/erts/emulator/beam/erl_trace.c
@@ -544,7 +544,7 @@ send_to_port(Process *c_p, Eterm message,
  */
 
 static void 
-profile_send(Eterm message) {
+profile_send(Eterm profiler, Eterm message) {
     Uint sz = 0;
     ErlHeapFragment *bp = NULL;
     Uint *hp = NULL;
@@ -552,8 +552,6 @@ profile_send(Eterm message) {
     Process *profile_p = NULL;
     ErlOffHeap *off_heap = NULL;
 
-    Eterm profiler = erts_get_system_profile();
-
     if (is_internal_port(profiler)) {
     	Port *profiler_port = NULL;
 
@@ -2583,6 +2581,7 @@ profile_scheduler(Eterm scheduler_id, Eterm state) {
     Uint Ms, s, us;
 
 #ifndef ERTS_SMP
+    Eterm profiler;
 #define LOCAL_HEAP_SIZE (4 + 7)
     DeclareTmpHeapNoproc(local_heap,LOCAL_HEAP_SIZE);
     UseTmpHeapNoproc(LOCAL_HEAP_SIZE);
@@ -2617,7 +2616,8 @@ profile_scheduler(Eterm scheduler_id, Eterm state) {
 		 make_small(active_sched), timestamp); hp += 7;
 
 #ifndef ERTS_SMP
-    profile_send(msg);
+    profiler = erts_get_system_profile();
+    profile_send(profiler, msg);
     UnUseTmpHeapNoproc(LOCAL_HEAP_SIZE);
 #undef LOCAL_HEAP_SIZE
 #else
@@ -2632,6 +2632,7 @@ profile_scheduler_q(Eterm scheduler_id, Eterm state, Eterm no_schedulers, Uint M
     Eterm *hp, msg, timestamp;
     
 #ifndef ERTS_SMP	
+    Eterm profiler;
 #define LOCAL_HEAP_SIZE (4 + 7)
     DeclareTmpHeapNoproc(local_heap,LOCAL_HEAP_SIZE);
     UseTmpHeapNoproc(LOCAL_HEAP_SIZE);
@@ -2652,7 +2653,8 @@ profile_scheduler_q(Eterm scheduler_id, Eterm state, Eterm no_schedulers, Uint M
     timestamp = TUPLE3(hp, make_small(Ms), make_small(s), make_small(us)); hp += 4;
     msg = TUPLE6(hp, am_profile, am_scheduler, scheduler_id, state, no_schedulers, timestamp); hp += 7;
 #ifndef ERTS_SMP
-    profile_send(msg);
+    profiler = erts_get_system_profile();
+    profile_send(profiler, msg);
     UnUseTmpHeapNoproc(LOCAL_HEAP_SIZE);
 #undef LOCAL_HEAP_SIZE
 #else
@@ -2895,6 +2897,7 @@ profile_runnable_port(Port *p, Eterm status) {
     Eterm count = make_small(0);
 
 #ifndef ERTS_SMP
+    Eterm profiler;
 #define LOCAL_HEAP_SIZE (4 + 6)
 
     DeclareTmpHeapNoproc(local_heap,LOCAL_HEAP_SIZE);
@@ -2919,7 +2922,8 @@ profile_runnable_port(Port *p, Eterm status) {
     msg = TUPLE5(hp, am_profile, p->id, status, count, timestamp); hp += 6;
 
 #ifndef ERTS_SMP
-    profile_send(msg);
+    profiler = erts_get_system_profile();
+    profile_send(profiler, msg);
     UnUseTmpHeapNoproc(LOCAL_HEAP_SIZE);
 #undef LOCAL_HEAP_SIZE
 #else
@@ -2934,6 +2938,7 @@ profile_runnable_proc(Process *p, Eterm status){
     Uint Ms, s, us;
     Eterm *hp, msg, timestamp;
     Eterm where = am_undefined;
+    Eterm profiler;
 
 #ifndef ERTS_SMP
 #define LOCAL_HEAP_SIZE (4 + 6 + 4)
@@ -2946,6 +2951,12 @@ profile_runnable_proc(Process *p, Eterm status){
     ErlHeapFragment *bp;
     Uint hsz = 4 + 6 + 4;
 #endif
+    profiler = erts_get_system_profile();
+
+    /* Do not profile profiler pid */
+    if (profiler == p->id) {
+	return;
+    }
 	
     if (!p->current) {
         p->current = find_function_from_pc(p->i);
@@ -2972,7 +2983,7 @@ profile_runnable_proc(Process *p, Eterm status){
     timestamp = TUPLE3(hp, make_small(Ms), make_small(s), make_small(us)); hp += 4;
     msg = TUPLE5(hp, am_profile, p->id, status, where, timestamp); hp += 6;
 #ifndef ERTS_SMP
-    profile_send(msg);
+    profile_send(profiler, msg);
     UnUseTmpHeapNoproc(LOCAL_HEAP_SIZE);
 #undef LOCAL_HEAP_SIZE
 #else
-- 
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