From 3ac08f9b668613a4292436979eacc61863c2ab94 Mon Sep 17 00:00:00 2001 From: Rickard Green Date: Wed, 16 Sep 2015 15:02:50 +0200 Subject: Fragmented young heap generation and off_heap_message_queue option * The youngest generation of the heap can now consist of multiple blocks. Heap fragments and message fragments are added to the youngest generation when needed without triggering a GC. After a GC the youngest generation is contained in one single block. * The off_heap_message_queue process flag has been added. When enabled all message data in the queue is kept off heap. When a message is selected from the queue, the message fragment (or heap fragment) containing the actual message is attached to the youngest generation. Messages stored off heap is not part of GC. --- erts/emulator/beam/utils.c | 17 +++++------------ 1 file changed, 5 insertions(+), 12 deletions(-) (limited to 'erts/emulator/beam/utils.c') diff --git a/erts/emulator/beam/utils.c b/erts/emulator/beam/utils.c index a741e2e2e6..e03113b8cc 100644 --- a/erts/emulator/beam/utils.c +++ b/erts/emulator/beam/utils.c @@ -110,7 +110,6 @@ Eterm* erts_heap_alloc(Process* p, Uint need, Uint xtra) { ErlHeapFragment* bp; - Eterm* htop; Uint n; #if defined(DEBUG) || defined(CHECK_FOR_HOLES) Uint i; @@ -156,16 +155,6 @@ erts_heap_alloc(Process* p, Uint need, Uint xtra) n--; #endif - /* - * When we have created a heap fragment, we are no longer allowed - * to store anything more on the heap. - */ - htop = HEAP_TOP(p); - if (htop < HEAP_LIMIT(p)) { - *htop = make_pos_bignum_header(HEAP_LIMIT(p)-htop-1); - HEAP_TOP(p) = HEAP_LIMIT(p); - } - bp->next = MBUF(p); MBUF(p) = bp; bp->alloc_size = n; @@ -2285,7 +2274,11 @@ static void do_send_logger_message(Eterm *hp, ErlOffHeap *ohp, ErlHeapFragment * erts_queue_error_logger_message(from, message, bp); } #else - erts_queue_message(p, NULL /* only used for smp build */, bp, message, NIL); + { + ErtsMessage *mp = erts_alloc_message(0, NULL); + mp->data.heap_frag = bp; + erts_queue_message(p, NULL /* only used for smp build */, mp, message, NIL); + } #endif } -- cgit v1.2.3