/*
- * sgen-marksweep.c: Simple generational GC.
+ * sgen-marksweep.c: The Mark & Sweep major collector.
*
* Author:
* Mark Probst <mark.probst@gmail.com>
*
* Copyright 2009-2010 Novell, Inc.
- *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, sublicense, and/or sell copies of the Software, and to
- * permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- *
- * The above copyright notice and this permission notice shall be
- * included in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
- * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
- * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
- * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ * Copyright (C) 2012 Xamarin Inc
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License 2.0 as published by the Free Software Foundation;
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License 2.0 along with this library; if not, write to the Free
+ * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "config.h"
unsigned int has_references : 1;
unsigned int has_pinned : 1; /* means cannot evacuate */
unsigned int is_to_space : 1;
+ unsigned int swept : 1;
#ifdef FIXED_HEAP
unsigned int used : 1;
unsigned int zeroed : 1;
void **free_list;
MSBlockInfo *next_free;
void **pin_queue_start;
+#ifdef SGEN_CONCURRENT_MARK
+ guint8 *cardtable_mod_union;
+#endif
mword mark_words [MS_NUM_MARK_WORDS];
};
#ifdef FIXED_HEAP
-static int ms_heap_num_blocks = MS_DEFAULT_HEAP_NUM_BLOCKS;
+static mword ms_heap_num_blocks = MS_DEFAULT_HEAP_NUM_BLOCKS;
static char *ms_heap_start;
static char *ms_heap_end;
#endif
#define MS_BLOCK_OBJ(b,i) ((b)->block + MS_BLOCK_SKIP + (b)->obj_size * (i))
+#define MS_BLOCK_OBJ_FOR_SIZE(b,i,obj_size) ((b)->block + MS_BLOCK_SKIP + (obj_size) * (i))
#define MS_BLOCK_DATA_FOR_OBJ(o) ((char*)((mword)(o) & ~(mword)(MS_BLOCK_SIZE - 1)))
#ifdef FIXED_HEAP
static float evacuation_threshold = 0.666;
static gboolean concurrent_sweep = FALSE;
+static gboolean lazy_sweep = TRUE;
static gboolean have_swept;
/* all allocated blocks in the system */
static long long stat_major_blocks_alloced = 0;
static long long stat_major_blocks_freed = 0;
+static long long stat_major_blocks_lazy_swept = 0;
static long long stat_major_objects_evacuated = 0;
static long long stat_time_wait_for_sweep = 0;
static MonoSemType ms_sweep_cmd_semaphore;
static MonoSemType ms_sweep_done_semaphore;
+static void
+sweep_block (MSBlockInfo *block);
+
static void
ms_signal_sweep_command (void)
{
ms_find_block_obj_size_index (int size)
{
int i;
- DEBUG (9, g_assert (size <= SGEN_MAX_SMALL_OBJ_SIZE));
+ SGEN_ASSERT (9, size <= SGEN_MAX_SMALL_OBJ_SIZE, "size %d is bigger than max small object size %d", size, SGEN_MAX_SMALL_OBJ_SIZE);
for (i = 0; i < num_block_obj_sizes; ++i)
if (block_obj_sizes [i] >= size)
return i;
char *nursery_start;
mword major_heap_size = ms_heap_num_blocks * MS_BLOCK_SIZE;
mword alloc_size = nursery_size + major_heap_size;
- int i;
+ mword i;
g_assert (ms_heap_num_blocks > 0);
g_assert (nursery_size % MS_BLOCK_SIZE == 0);
if (nursery_align)
g_assert (nursery_align % MS_BLOCK_SIZE == 0);
- nursery_start = sgen_alloc_os_memory_aligned (alloc_size, nursery_align ? nursery_align : MS_BLOCK_SIZE, TRUE);
+ nursery_start = sgen_alloc_os_memory_aligned (alloc_size, nursery_align ? nursery_align : MS_BLOCK_SIZE, SGEN_ALLOC_HEAP | SGEN_ALLOC_ACTIVATE, "heap");
ms_heap_start = nursery_start + nursery_size;
ms_heap_end = ms_heap_start + major_heap_size;
- block_infos = sgen_alloc_internal_dynamic (sizeof (MSBlockInfo) * ms_heap_num_blocks, INTERNAL_MEM_MS_BLOCK_INFO);
+ block_infos = sgen_alloc_internal_dynamic (sizeof (MSBlockInfo) * ms_heap_num_blocks, INTERNAL_MEM_MS_BLOCK_INFO, TRUE);
for (i = 0; i < ms_heap_num_blocks; ++i) {
block_infos [i].block = ms_heap_start + i * MS_BLOCK_SIZE;
{
char *start;
if (nursery_align)
- start = sgen_alloc_os_memory_aligned (nursery_size, nursery_align, TRUE);
+ start = sgen_alloc_os_memory_aligned (nursery_size, nursery_align, SGEN_ALLOC_HEAP | SGEN_ALLOC_ACTIVATE, "nursery");
else
- start = sgen_alloc_os_memory (nursery_size, TRUE);
+ start = sgen_alloc_os_memory (nursery_size, SGEN_ALLOC_HEAP | SGEN_ALLOC_ACTIVATE, "nursery");
return start;
}
retry:
if (!empty_blocks) {
- p = sgen_alloc_os_memory_aligned (MS_BLOCK_SIZE * MS_BLOCK_ALLOC_NUM, MS_BLOCK_SIZE, TRUE);
+ p = sgen_alloc_os_memory_aligned (MS_BLOCK_SIZE * MS_BLOCK_ALLOC_NUM, MS_BLOCK_SIZE, SGEN_ALLOC_HEAP | SGEN_ALLOC_ACTIVATE, "major heap section");
for (i = 0; i < MS_BLOCK_ALLOC_NUM; ++i) {
block = p;
/* blocks in the free lists must have at least
one free slot */
- g_assert (block->free_list);
+ if (block->swept)
+ g_assert (block->free_list);
#ifdef FIXED_HEAP
/* the block must not be in the empty_blocks list */
g_assert (num_free == 0);
/* check all mark words are zero */
- for (i = 0; i < MS_NUM_MARK_WORDS; ++i)
- g_assert (block->mark_words [i] == 0);
+ if (block->swept) {
+ for (i = 0; i < MS_NUM_MARK_WORDS; ++i)
+ g_assert (block->mark_words [i] == 0);
+ }
} END_FOREACH_BLOCK;
/* check free blocks */
info = sgen_alloc_internal (INTERNAL_MEM_MS_BLOCK_INFO);
#endif
- DEBUG (9, g_assert (count >= 2));
+ SGEN_ASSERT (9, count >= 2, "block with %d objects, it must hold at least 2", count);
info->obj_size = size;
info->obj_size_index = size_index;
info->has_references = has_references;
info->has_pinned = pinned;
info->is_to_space = (sgen_get_current_collection_generation () == GENERATION_OLD); /*FIXME WHY??? */
+ info->swept = 1;
#ifndef FIXED_HEAP
info->block = ms_get_empty_block ();
header = (MSBlockHeader*) info->block;
header->info = info;
#endif
+#ifdef SGEN_CONCURRENT_MARK
+ info->cardtable_mod_union = NULL;
+#endif
update_heap_boundaries_for_block (info);
void *obj;
block = free_blocks [size_index];
- DEBUG (9, g_assert (block));
+ SGEN_ASSERT (9, block, "no free block to unlink from free_blocks %p size_index %d", free_blocks, size_index);
+
+ if (G_UNLIKELY (!block->swept)) {
+ stat_major_blocks_lazy_swept ++;
+ sweep_block (block);
+ }
obj = block->free_list;
- DEBUG (9, g_assert (obj));
+ SGEN_ASSERT (9, obj, "block %p in free list had no available object to alloc from", block);
block->free_list = *(void**)obj;
if (!block->free_list) {
}
static void*
-alloc_obj_par (int size, gboolean pinned, gboolean has_references)
+alloc_obj_par (MonoVTable *vtable, int size, gboolean pinned, gboolean has_references)
{
int size_index = MS_BLOCK_OBJ_SIZE_INDEX (size);
MSBlockInfo **free_blocks_local = FREE_BLOCKS_LOCAL (pinned, has_references);
MSBlockInfo *block;
void *obj;
- DEBUG (9, g_assert (!ms_sweep_in_progress));
- DEBUG (9, g_assert (current_collection_generation == GENERATION_OLD));
+ SGEN_ASSERT (9, !ms_sweep_in_progress, "concurrent sweep in progress with concurrent allocation");
+ SGEN_ASSERT (9, current_collection_generation == GENERATION_OLD, "old gen parallel allocator called from a %d collection", current_collection_generation);
if (free_blocks_local [size_index]) {
get_slot:
}
}
- /*
- * FIXME: This should not be necessary because it'll be
- * overwritten by the vtable immediately.
- */
- *(void**)obj = NULL;
+ *(MonoVTable**)obj = vtable;
+
+#ifdef SGEN_CONCURRENT_MARK
+ g_assert_not_reached ();
+#endif
return obj;
}
static void*
-major_par_alloc_object (int size, gboolean has_references)
+major_par_alloc_object (MonoVTable *vtable, int size, gboolean has_references)
{
- return alloc_obj_par (size, FALSE, has_references);
+ return alloc_obj_par (vtable, size, FALSE, has_references);
}
#endif
static void*
-alloc_obj (int size, gboolean pinned, gboolean has_references)
+alloc_obj (MonoVTable *vtable, int size, gboolean pinned, gboolean has_references)
{
int size_index = MS_BLOCK_OBJ_SIZE_INDEX (size);
MSBlockInfo **free_blocks = FREE_BLOCKS (pinned, has_references);
void *obj;
#ifdef SGEN_PARALLEL_MARK
- DEBUG (9, g_assert (current_collection_generation != GENERATION_OLD));
+ SGEN_ASSERT (9, current_collection_generation == GENERATION_OLD, "old gen parallel allocator called from a %d collection", current_collection_generation);
+
#endif
- DEBUG (9, g_assert (!ms_sweep_in_progress));
+ SGEN_ASSERT (9, !ms_sweep_in_progress, "concurrent sweep in progress with concurrent allocation");
if (!free_blocks [size_index]) {
if (G_UNLIKELY (!ms_alloc_block (size_index, pinned, has_references)))
obj = unlink_slot_from_free_list_uncontested (free_blocks, size_index);
- /*
- * FIXME: This should not be necessary because it'll be
- * overwritten by the vtable immediately.
- */
- *(void**)obj = NULL;
+ *(MonoVTable**)obj = vtable;
+
+#ifdef SGEN_CONCURRENT_MARK
+ if (obj && sgen_remember_major_object_for_concurrent_mark (obj)) {
+ MSBlockInfo *block = MS_BLOCK_FOR_OBJ (obj);
+ int word, bit;
+ MS_CALC_MARK_BIT (word, bit, obj);
+ MS_SET_MARK_BIT (block, word, bit);
+ binary_protocol_mark (obj, NULL, size);
+ }
+#endif
return obj;
}
static void*
-major_alloc_object (int size, gboolean has_references)
+major_alloc_object (MonoVTable *vtable, int size, gboolean has_references)
{
- return alloc_obj (size, FALSE, has_references);
+ return alloc_obj (vtable, size, FALSE, has_references);
}
/*
{
MSBlockInfo *block = MS_BLOCK_FOR_OBJ (obj);
int word, bit;
- DEBUG (9, g_assert ((pinned && block->pinned) || (!pinned && !block->pinned)));
- DEBUG (9, g_assert (MS_OBJ_ALLOCED (obj, block)));
+
+ if (!block->swept)
+ sweep_block (block);
+ SGEN_ASSERT (9, (pinned && block->pinned) || (!pinned && !block->pinned), "free-object pinning mixup object %p pinned %d block %p pinned %d", obj, pinned, block, block->pinned);
+ SGEN_ASSERT (9, MS_OBJ_ALLOCED (obj, block), "object %p is already free", obj);
MS_CALC_MARK_BIT (word, bit, obj);
- DEBUG (9, g_assert (!MS_MARK_BIT (block, word, bit)));
+ SGEN_ASSERT (9, !MS_MARK_BIT (block, word, bit), "object %p has mark bit set");
if (!block->free_list) {
MSBlockInfo **free_blocks = FREE_BLOCKS (pinned, block->has_references);
int size_index = MS_BLOCK_OBJ_SIZE_INDEX (size);
- DEBUG (9, g_assert (!block->next_free));
+ SGEN_ASSERT (9, !block->next_free, "block %p doesn't have a free-list of object but belongs to a free-list of blocks");
block->next_free = free_blocks [size_index];
free_blocks [size_index] = block;
}
/* size is a multiple of SGEN_ALLOC_ALIGN */
static void*
-major_alloc_small_pinned_obj (size_t size, gboolean has_references)
+major_alloc_small_pinned_obj (MonoVTable *vtable, size_t size, gboolean has_references)
{
void *res;
ms_wait_for_sweep_done ();
- res = alloc_obj (size, TRUE, has_references);
+ res = alloc_obj (vtable, size, TRUE, has_references);
/*If we failed to alloc memory, we better try releasing memory
*as pinned alloc is requested by the runtime.
*/
if (!res) {
- sgen_perform_collection (0, GENERATION_OLD, "pinned alloc failure");
- res = alloc_obj (size, TRUE, has_references);
+ sgen_perform_collection (0, GENERATION_OLD, "pinned alloc failure", TRUE);
+ res = alloc_obj (vtable, size, TRUE, has_references);
}
return res;
}
old_num_sections = num_major_sections;
- obj = alloc_obj (size, FALSE, SGEN_VTABLE_HAS_REFERENCES (vtable));
+ obj = alloc_obj (vtable, size, FALSE, SGEN_VTABLE_HAS_REFERENCES (vtable));
if (G_LIKELY (obj)) {
- *(MonoVTable**)obj = vtable;
HEAVY_STAT (++stat_objects_alloced_degraded);
HEAVY_STAT (stat_bytes_alloced_degraded += size);
g_assert (num_major_sections >= old_num_sections);
/* now we know it's in a major block */
block = MS_BLOCK_FOR_OBJ (obj);
- DEBUG (9, g_assert (!block->pinned));
+ SGEN_ASSERT (9, !block->pinned, "block %p is pinned, BTW why is this bad?");
MS_CALC_MARK_BIT (word, bit, obj);
return MS_MARK_BIT (block, word, bit) ? TRUE : FALSE;
}
static gboolean
-major_ptr_is_in_non_pinned_space (char *ptr)
+major_ptr_is_in_non_pinned_space (char *ptr, char **start)
{
MSBlockInfo *block;
FOREACH_BLOCK (block) {
- if (ptr >= block->block && ptr <= block->block + MS_BLOCK_SIZE)
+ if (ptr >= block->block && ptr <= block->block + MS_BLOCK_SIZE) {
+ int count = MS_BLOCK_FREE / block->obj_size;
+ int i;
+
+ *start = NULL;
+ for (i = 0; i <= count; ++i) {
+ if (ptr >= MS_BLOCK_OBJ (block, i) && ptr < MS_BLOCK_OBJ (block, i + 1)) {
+ *start = MS_BLOCK_OBJ (block, i);
+ break;
+ }
+ }
return !block->pinned;
+ }
} END_FOREACH_BLOCK;
return FALSE;
}
continue;
if (!block->pinned && !non_pinned)
continue;
+ if (lazy_sweep)
+ sweep_block (block);
for (i = 0; i < count; ++i) {
void **obj = (void**) MS_BLOCK_OBJ (block, i);
if ((block->block > ptr) || ((block->block + MS_BLOCK_SIZE) <= ptr))
continue;
- fprintf (gc_debug_file, "major-ptr (block %p sz %d pin %d ref %d) ",
+ SGEN_LOG (1, "major-ptr (block %p sz %d pin %d ref %d) ",
block->block, block->obj_size, block->pinned, block->has_references);
idx = MS_BLOCK_OBJ_INDEX (ptr, block);
if (obj == ptr) {
if (live)
- fprintf (gc_debug_file, "(object %s.%s)", vtable->klass->name_space, vtable->klass->name);
+ SGEN_LOG (1, "\t(object %s.%s)", vtable->klass->name_space, vtable->klass->name);
else
- fprintf (gc_debug_file, "(dead-object)");
+ SGEN_LOG (1, "(dead-object)");
} else {
if (live)
- fprintf (gc_debug_file, "(interior-ptr offset %td of %p %s.%s)",
+ SGEN_LOG (1, "(interior-ptr offset %td of %p %s.%s)",
ptr - obj,
obj, vtable->klass->name_space, vtable->klass->name);
else
- fprintf (gc_debug_file, "(dead-interior-ptr to %td to %p)",
+ SGEN_LOG (1, "(dead-interior-ptr to %td to %p)",
ptr - obj, obj);
}
#define MS_MARK_OBJECT_AND_ENQUEUE(obj,block,queue) do { \
int __word, __bit; \
MS_CALC_MARK_BIT (__word, __bit, (obj)); \
- DEBUG (9, g_assert (MS_OBJ_ALLOCED ((obj), (block)))); \
+ SGEN_ASSERT (9, MS_OBJ_ALLOCED ((obj), (block)), "object %p not allocated", obj); \
if (!MS_MARK_BIT ((block), __word, __bit)) { \
MS_SET_MARK_BIT ((block), __word, __bit); \
if ((block)->has_references) \
#define MS_PAR_MARK_OBJECT_AND_ENQUEUE(obj,block,queue) do { \
int __word, __bit; \
gboolean __was_marked; \
- DEBUG (9, g_assert (MS_OBJ_ALLOCED ((obj), (block)))); \
+ SGEN_ASSERT (9, MS_OBJ_ALLOCED ((obj), (block)), "object %p not allocated", obj); \
MS_CALC_MARK_BIT (__word, __bit, (obj)); \
MS_PAR_SET_MARK_BIT (__was_marked, (block), __word, __bit); \
if (!__was_marked) { \
static void
pin_major_object (char *obj, SgenGrayQueue *queue)
{
+#ifdef SGEN_CONCURRENT_MARK
+ g_assert_not_reached ();
+#else
MSBlockInfo *block = MS_BLOCK_FOR_OBJ (obj);
block->has_pinned = TRUE;
MS_MARK_OBJECT_AND_ENQUEUE (obj, block, queue);
+#endif
}
#include "sgen-major-copy-object.h"
HEAVY_STAT (++stat_copy_object_called_major);
- DEBUG (9, g_assert (obj));
- DEBUG (9, g_assert (current_collection_generation == GENERATION_OLD));
+ SGEN_ASSERT (9, obj, "null object from pointer %p", ptr);
+ SGEN_ASSERT (9, current_collection_generation == GENERATION_OLD, "old gen parallel allocator called from a %d collection", current_collection_generation);
if (sgen_ptr_in_nursery (obj)) {
int word, bit;
objsize = SGEN_ALIGN_UP (sgen_par_object_get_size (vt, (MonoObject*)obj));
has_references = SGEN_VTABLE_HAS_REFERENCES (vt);
- destination = sgen_minor_collector.par_alloc_for_promotion (obj, objsize, has_references);
+ destination = sgen_minor_collector.par_alloc_for_promotion (vt, obj, objsize, has_references);
if (G_UNLIKELY (!destination)) {
if (!sgen_ptr_in_nursery (obj)) {
int size_index;
return;
}
- /*
- * We do this before the CAS because we want to make
- * sure that if another thread sees the destination
- * pointer the VTable is already in place. Not doing
- * this can crash binary protocols.
- */
- *(MonoVTable**)destination = vt;
-
if (SGEN_CAS_PTR (obj, (void*)((mword)destination | SGEN_FORWARDED_BIT), vt) == vt) {
gboolean was_marked;
if (!sgen_ptr_in_nursery (obj)) {
block = MS_BLOCK_FOR_OBJ (obj);
MS_CALC_MARK_BIT (word, bit, obj);
- DEBUG (9, g_assert (!MS_MARK_BIT (block, word, bit)));
+ SGEN_ASSERT (9, !MS_MARK_BIT (block, word, bit), "object %p already marked", obj);
MS_PAR_SET_MARK_BIT (was_marked, block, word, bit);
}
} else {
MS_PAR_MARK_OBJECT_AND_ENQUEUE (obj, block, queue);
} else {
-#ifdef FIXED_HEAP
- mword vtable_word = *(mword*)obj;
- vt = (MonoVTable*)(vtable_word & ~SGEN_VTABLE_BITS_MASK);
-#endif
+ LOSObject *bigobj = sgen_los_header_for_object (obj);
+ mword size_word = bigobj->size;
- if (vtable_word & SGEN_PINNED_BIT)
+ if (size_word & 1)
return;
binary_protocol_pin (obj, vt, sgen_safe_object_get_size ((MonoObject*)obj));
- if (SGEN_CAS_PTR (obj, (void*)(vtable_word | SGEN_PINNED_BIT), (void*)vtable_word) == (void*)vtable_word) {
+ if (SGEN_CAS_PTR ((void*)&bigobj->size, (void*)(size_word | 1), (void*)size_word) == (void*)size_word) {
if (SGEN_VTABLE_HAS_REFERENCES (vt))
GRAY_OBJECT_ENQUEUE (queue, obj);
} else {
- g_assert (SGEN_OBJECT_IS_PINNED (obj));
+ g_assert (sgen_los_object_is_pinned (obj));
}
}
}
}
#else
+#ifdef SGEN_CONCURRENT_MARK
+static void
+major_copy_or_mark_object (void **ptr, SgenGrayQueue *queue)
+{
+ void *obj = *ptr;
+
+ g_assert (!SGEN_OBJECT_IS_FORWARDED (obj));
+
+ if (sgen_ptr_in_nursery (obj)) {
+ g_assert (!SGEN_OBJECT_IS_PINNED (obj));
+ } else {
+#ifdef FIXED_HEAP
+ if (MS_PTR_IN_SMALL_MAJOR_HEAP (obj))
+#else
+ mword objsize;
+
+ objsize = SGEN_ALIGN_UP (sgen_safe_object_get_size ((MonoObject*)obj));
+
+ if (objsize <= SGEN_MAX_SMALL_OBJ_SIZE)
+#endif
+ {
+ MSBlockInfo *block = MS_BLOCK_FOR_OBJ (obj);
+ MS_MARK_OBJECT_AND_ENQUEUE (obj, block, queue);
+ } else {
+ if (sgen_los_object_is_pinned (obj))
+ return;
+ if (G_UNLIKELY (MONO_GC_OBJ_PINNED_ENABLED ())) {
+ MonoVTable *vt = (MonoVTable*)SGEN_LOAD_VTABLE (obj);
+ MONO_GC_OBJ_PINNED ((mword)obj, sgen_safe_object_get_size (obj), vt->klass->name_space, vt->klass->name, GENERATION_OLD);
+ }
+ sgen_los_pin_object (obj);
+ /* FIXME: only enqueue if object has references */
+ GRAY_OBJECT_ENQUEUE (queue, obj);
+ }
+ }
+}
+#else
static void
major_copy_or_mark_object (void **ptr, SgenGrayQueue *queue)
{
HEAVY_STAT (++stat_copy_object_called_major);
- DEBUG (9, g_assert (obj));
- DEBUG (9, g_assert (current_collection_generation == GENERATION_OLD));
+ SGEN_ASSERT (9, obj, "null object from pointer %p", ptr);
+ SGEN_ASSERT (9, current_collection_generation == GENERATION_OLD, "old gen parallel allocator called from a %d collection", current_collection_generation);
if (sgen_ptr_in_nursery (obj)) {
int word, bit;
if (!sgen_ptr_in_nursery (obj)) {
block = MS_BLOCK_FOR_OBJ (obj);
MS_CALC_MARK_BIT (word, bit, obj);
- DEBUG (9, g_assert (!MS_MARK_BIT (block, word, bit)));
+ SGEN_ASSERT (9, !MS_MARK_BIT (block, word, bit), "object %p already marked", obj);
MS_SET_MARK_BIT (block, word, bit);
}
} else {
MS_MARK_OBJECT_AND_ENQUEUE (obj, block, queue);
}
} else {
- if (SGEN_OBJECT_IS_PINNED (obj))
+ if (sgen_los_object_is_pinned (obj))
return;
binary_protocol_pin (obj, (gpointer)SGEN_LOAD_VTABLE (obj), sgen_safe_object_get_size ((MonoObject*)obj));
- SGEN_PIN_OBJECT (obj);
+ if (G_UNLIKELY (MONO_GC_OBJ_PINNED_ENABLED ())) {
+ MonoVTable *vt = (MonoVTable*)SGEN_LOAD_VTABLE (obj);
+ MONO_GC_OBJ_PINNED ((mword)obj, sgen_safe_object_get_size (obj), vt->klass->name_space, vt->klass->name, GENERATION_OLD);
+ }
+ sgen_los_pin_object (obj);
/* FIXME: only enqueue if object has references */
GRAY_OBJECT_ENQUEUE (queue, obj);
}
}
}
#endif
+#endif
#include "sgen-major-scan-object.h"
for (i = 0; i < block->pin_queue_num_entries; ++i) {
int index = MS_BLOCK_OBJ_INDEX (block->pin_queue_start [i], block);
- DEBUG (9, g_assert (index >= 0 && index < MS_BLOCK_FREE / block->obj_size));
+ SGEN_ASSERT (9, index >= 0 && index < MS_BLOCK_FREE / block->obj_size, "invalid object %p index %d max-index %d", block->pin_queue_start [i], index, MS_BLOCK_FREE / block->obj_size);
if (index == last_index)
continue;
MS_MARK_OBJECT_AND_ENQUEUE_CHECKED (MS_BLOCK_OBJ (block, index), block, queue);
}
}
+static inline void
+sweep_block_for_size (MSBlockInfo *block, int count, int obj_size)
+{
+ int obj_index;
+
+ for (obj_index = 0; obj_index < count; ++obj_index) {
+ int word, bit;
+ void *obj = MS_BLOCK_OBJ_FOR_SIZE (block, obj_index, obj_size);
+
+ MS_CALC_MARK_BIT (word, bit, obj);
+ if (MS_MARK_BIT (block, word, bit)) {
+ SGEN_ASSERT (9, MS_OBJ_ALLOCED (obj, block), "object %p not allocated", obj);
+ } else {
+ /* an unmarked object */
+ if (MS_OBJ_ALLOCED (obj, block)) {
+ /*
+ * FIXME: Merge consecutive
+ * slots for lower reporting
+ * overhead. Maybe memset
+ * will also benefit?
+ */
+ binary_protocol_empty (obj, obj_size);
+ MONO_GC_MAJOR_SWEPT ((mword)obj, obj_size);
+ memset (obj, 0, obj_size);
+ }
+ *(void**)obj = block->free_list;
+ block->free_list = obj;
+ }
+ }
+}
+
+/*
+ * sweep_block:
+ *
+ * Traverse BLOCK, freeing and zeroing unused objects.
+ */
+static void
+sweep_block (MSBlockInfo *block)
+{
+ int count;
+
+ if (block->swept)
+ return;
+
+ count = MS_BLOCK_FREE / block->obj_size;
+
+ block->free_list = NULL;
+
+ /* Use inline instances specialized to constant sizes, this allows the compiler to replace the memset calls with inline code */
+ // FIXME: Add more sizes
+ switch (block->obj_size) {
+ case 16:
+ sweep_block_for_size (block, count, 16);
+ break;
+ default:
+ sweep_block_for_size (block, count, block->obj_size);
+ break;
+ }
+
+ /* reset mark bits */
+ memset (block->mark_words, 0, sizeof (mword) * MS_NUM_MARK_WORDS);
+
+ /*
+ * FIXME: reverse free list so that it's in address
+ * order
+ */
+
+ block->swept = 1;
+}
+
+static inline int
+bitcount (mword d)
+{
+#if SIZEOF_VOID_P == 8
+ /* http://www.jjj.de/bitwizardry/bitwizardrypage.html */
+ d -= (d>>1) & 0x5555555555555555;
+ d = ((d>>2) & 0x3333333333333333) + (d & 0x3333333333333333);
+ d = ((d>>4) + d) & 0x0f0f0f0f0f0f0f0f;
+ d *= 0x0101010101010101;
+ return d >> 56;
+#else
+ /* http://aggregate.org/MAGIC/ */
+ d -= ((d >> 1) & 0x55555555);
+ d = (((d >> 2) & 0x33333333) + (d & 0x33333333));
+ d = (((d >> 4) + d) & 0x0f0f0f0f);
+ d += (d >> 8);
+ d += (d >> 16);
+ return (d & 0x0000003f);
+#endif
+}
+
static void
ms_sweep (void)
{
int count;
gboolean have_live = FALSE;
gboolean has_pinned;
- int obj_index;
+ gboolean have_free = FALSE;
int obj_size_index;
+ int nused = 0;
obj_size_index = block->obj_size_index;
block->has_pinned = block->pinned;
block->is_to_space = FALSE;
+ block->swept = 0;
count = MS_BLOCK_FREE / block->obj_size;
- block->free_list = NULL;
- for (obj_index = 0; obj_index < count; ++obj_index) {
- int word, bit;
- void *obj = MS_BLOCK_OBJ (block, obj_index);
-
- MS_CALC_MARK_BIT (word, bit, obj);
- if (MS_MARK_BIT (block, word, bit)) {
- DEBUG (9, g_assert (MS_OBJ_ALLOCED (obj, block)));
- have_live = TRUE;
- if (!has_pinned)
- ++slots_used [obj_size_index];
- } else {
- /* an unmarked object */
- if (MS_OBJ_ALLOCED (obj, block)) {
- binary_protocol_empty (obj, block->obj_size);
- memset (obj, 0, block->obj_size);
- }
- *(void**)obj = block->free_list;
- block->free_list = obj;
- }
+#ifdef SGEN_CONCURRENT_MARK
+ if (block->cardtable_mod_union) {
+ sgen_free_internal_dynamic (block->cardtable_mod_union, CARDS_PER_BLOCK, INTERNAL_MEM_CARDTABLE_MOD_UNION);
+ block->cardtable_mod_union = NULL;
}
+#endif
- /* reset mark bits */
- memset (block->mark_words, 0, sizeof (mword) * MS_NUM_MARK_WORDS);
+ /* Count marked objects in the block */
+ for (i = 0; i < MS_NUM_MARK_WORDS; ++i) {
+ nused += bitcount (block->mark_words [i]);
+ }
+ if (nused) {
+ have_live = TRUE;
+ }
+ if (nused < count)
+ have_free = TRUE;
- /*
- * FIXME: reverse free list so that it's in address
- * order
- */
+ if (!lazy_sweep)
+ sweep_block (block);
if (have_live) {
if (!has_pinned) {
++num_blocks [obj_size_index];
+ slots_used [obj_size_index] += nused;
slots_available [obj_size_index] += count;
}
* If there are free slots in the block, add
* the block to the corresponding free list.
*/
- if (block->free_list) {
+ if (have_free) {
MSBlockInfo **free_blocks = FREE_BLOCKS (block->pinned, block->has_references);
int index = MS_BLOCK_OBJ_SIZE_INDEX (block->obj_size);
block->next_free = free_blocks [index];
--num_major_sections;
}
}
-
for (i = 0; i < num_block_obj_sizes; ++i) {
float usage = (float)slots_used [i] / (float)slots_available [i];
if (num_blocks [i] > 5 && usage < evacuation_threshold) {
++count_pinned_nonref;
}
-static void __attribute__ ((unused))
+static G_GNUC_UNUSED void
count_ref_nonref_objs (void)
{
int total;
free_block_lists [0][i] = NULL;
free_block_lists [MS_BLOCK_FLAG_REFS][i] = NULL;
}
+
+ // Sweep all unswept blocks
+ if (lazy_sweep) {
+ MSBlockInfo **iter;
+
+ MONO_GC_SWEEP_BEGIN (GENERATION_OLD, TRUE);
+
+ iter = &all_blocks;
+ while (*iter) {
+ MSBlockInfo *block = *iter;
+
+ sweep_block (block);
+
+ iter = &block->next;
+ }
+
+ MONO_GC_SWEEP_END (GENERATION_OLD, TRUE);
+ }
}
static void
while (num_empty_blocks > section_reserve) {
void *next = *(void**)empty_blocks;
- sgen_free_os_memory (empty_blocks, MS_BLOCK_SIZE);
+ sgen_free_os_memory (empty_blocks, MS_BLOCK_SIZE, SGEN_ALLOC_HEAP);
empty_blocks = next;
/*
* Needs not be atomic because this is running
#define MS_OBJ_ALLOCED_FAST(o,b) (*(void**)(o) && (*(char**)(o) < (b) || *(char**)(o) >= (b) + MS_BLOCK_SIZE))
static void
-major_scan_card_table (SgenGrayQueue *queue)
+major_scan_card_table (gboolean mod_union, SgenGrayQueue *queue)
{
MSBlockInfo *block;
ScanObjectFunc scan_func = sgen_get_current_object_ops ()->scan_object;
#endif
char *obj, *end, *base;
+ if (mod_union) {
+#ifdef SGEN_CONCURRENT_MARK
+ cards = block->cardtable_mod_union;
+ g_assert (cards);
+#else
+ g_assert_not_reached ();
+#endif
+ } else {
/*We can avoid the extra copy since the remark cardtable was cleaned before */
#ifdef SGEN_HAVE_OVERLAPPING_CARDS
- cards = sgen_card_table_get_card_scan_address ((mword)block_start);
+ cards = sgen_card_table_get_card_scan_address ((mword)block_start);
#else
- cards = cards_data;
- if (!sgen_card_table_get_card_data (cards_data, (mword)block_start, CARDS_PER_BLOCK))
- continue;
+ cards = cards_data;
+ if (!sgen_card_table_get_card_data (cards_data, (mword)block_start, CARDS_PER_BLOCK))
+ continue;
#endif
+ }
+
+ if (!block->swept)
+ sweep_block (block);
obj = (char*)MS_BLOCK_OBJ_FAST (block_start, block_obj_size, 0);
end = block_start + MS_BLOCK_SIZE;
base = sgen_card_table_align_pointer (obj);
while (obj < end) {
- if (MS_OBJ_ALLOCED_FAST (obj, block_start)) {
- int card_offset = (obj - base) >> CARD_BITS;
- sgen_cardtable_scan_object (obj, block_obj_size, cards + card_offset, queue);
+ int card_offset;
+
+ if (!MS_OBJ_ALLOCED_FAST (obj, block_start))
+ goto next_large;
+
+ if (mod_union) {
+ /* FIXME: do this more efficiently */
+ int w, b;
+ MS_CALC_MARK_BIT (w, b, obj);
+ if (!MS_MARK_BIT (block, w, b))
+ goto next_large;
}
+
+ card_offset = (obj - base) >> CARD_BITS;
+ sgen_cardtable_scan_object (obj, block_obj_size, cards + card_offset, queue);
+
+ next_large:
obj += block_obj_size;
}
} else {
* Cards aliasing happens in powers of two, so as long as major blocks are aligned to their
* sizes, they won't overflow the cardtable overlap modulus.
*/
- card_data = card_base = sgen_card_table_get_card_scan_address ((mword)block_start);
+ if (mod_union) {
+#ifdef SGEN_CONCURRENT_MARK
+ card_data = card_base = block->cardtable_mod_union;
+ /*
+ * This happens when the nursery
+ * collection that precedes finishing
+ * the concurrent collection allocates
+ * new major blocks.
+ */
+ if (!card_data)
+ continue;
+#else
+ g_assert_not_reached ();
+#endif
+ } else {
+ card_data = card_base = sgen_card_table_get_card_scan_address ((mword)block_start);
+ }
card_data_end = card_data + CARDS_PER_BLOCK;
for (card_data = initial_skip_card (card_data); card_data < card_data_end; ++card_data) { //card_data = skip_card (card_data + 1, card_data_end)) {
if (!*card_data)
continue;
+ if (!block->swept)
+ sweep_block (block);
+
HEAVY_STAT (++marked_cards);
sgen_card_table_prepare_card_for_scanning (card_data);
obj = (char*)MS_BLOCK_OBJ_FAST (block_start, block_obj_size, index);
while (obj < end) {
- if (MS_OBJ_ALLOCED_FAST (obj, block_start)) {
- HEAVY_STAT (++scanned_objects);
- scan_func (obj, queue);
+ if (!MS_OBJ_ALLOCED_FAST (obj, block_start))
+ goto next_small;
+
+ if (mod_union) {
+ /* FIXME: do this more efficiently */
+ int w, b;
+ MS_CALC_MARK_BIT (w, b, obj);
+ if (!MS_MARK_BIT (block, w, b))
+ goto next_small;
}
+
+ HEAVY_STAT (++scanned_objects);
+ scan_func (obj, queue);
+ next_small:
obj += block_obj_size;
}
HEAVY_STAT (if (*card_data) ++remarked_cards);
}
} END_FOREACH_BLOCK;
}
+
+#ifdef SGEN_CONCURRENT_MARK
+static void
+update_cardtable_mod_union (void)
+{
+ MSBlockInfo *block;
+
+ FOREACH_BLOCK (block) {
+ guint8 *cards;
+ gboolean init = FALSE;
+
+ if (!block->cardtable_mod_union) {
+ block->cardtable_mod_union = sgen_alloc_internal_dynamic (CARDS_PER_BLOCK,
+ INTERNAL_MEM_CARDTABLE_MOD_UNION, TRUE);
+ init = TRUE;
+ }
+
+ cards = sgen_card_table_get_card_scan_address ((mword)block->block);
+ if (init) {
+ memcpy (block->cardtable_mod_union, cards, CARDS_PER_BLOCK);
+ } else {
+ int i;
+ for (i = 0; i < CARDS_PER_BLOCK; ++i)
+ block->cardtable_mod_union [i] |= cards [i];
+ }
+ } END_FOREACH_BLOCK;
+}
+#endif
#endif
static gboolean
{
int i;
for (i = 0; i < MS_BLOCK_TYPE_MAX; ++i)
- lists [i] = sgen_alloc_internal_dynamic (sizeof (MSBlockInfo*) * num_block_obj_sizes, INTERNAL_MEM_MS_TABLES);
+ lists [i] = sgen_alloc_internal_dynamic (sizeof (MSBlockInfo*) * num_block_obj_sizes, INTERNAL_MEM_MS_TABLES, TRUE);
}
#ifdef SGEN_PARALLEL_MARK
#undef pthread_create
static void
-post_param_init (void)
+post_param_init (SgenMajorCollector *collector)
{
if (concurrent_sweep) {
if (!mono_native_thread_create (&ms_sweep_thread, ms_sweep_thread_func, NULL)) {
exit (1);
}
}
+
+ collector->sweeps_lazily = lazy_sweep;
}
void
+#ifdef SGEN_CONCURRENT_MARK
+sgen_marksweep_conc_init
+#else
#ifdef SGEN_PARALLEL_MARK
#ifdef FIXED_HEAP
sgen_marksweep_fixed_par_init
#else
sgen_marksweep_init
#endif
+#endif
#endif
(SgenMajorCollector *collector)
{
#endif
num_block_obj_sizes = ms_calculate_block_obj_sizes (MS_BLOCK_OBJ_SIZE_FACTOR, NULL);
- block_obj_sizes = sgen_alloc_internal_dynamic (sizeof (int) * num_block_obj_sizes, INTERNAL_MEM_MS_TABLES);
+ block_obj_sizes = sgen_alloc_internal_dynamic (sizeof (int) * num_block_obj_sizes, INTERNAL_MEM_MS_TABLES, TRUE);
ms_calculate_block_obj_sizes (MS_BLOCK_OBJ_SIZE_FACTOR, block_obj_sizes);
- evacuate_block_obj_sizes = sgen_alloc_internal_dynamic (sizeof (gboolean) * num_block_obj_sizes, INTERNAL_MEM_MS_TABLES);
+ evacuate_block_obj_sizes = sgen_alloc_internal_dynamic (sizeof (gboolean) * num_block_obj_sizes, INTERNAL_MEM_MS_TABLES, TRUE);
for (i = 0; i < num_block_obj_sizes; ++i)
evacuate_block_obj_sizes [i] = FALSE;
mono_counters_register ("# major blocks allocated", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_major_blocks_alloced);
mono_counters_register ("# major blocks freed", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_major_blocks_freed);
+ mono_counters_register ("# major blocks lazy swept", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_major_blocks_lazy_swept);
mono_counters_register ("# major objects evacuated", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_major_objects_evacuated);
mono_counters_register ("Wait for sweep time", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &stat_time_wait_for_sweep);
#ifdef SGEN_PARALLEL_MARK
collector->reset_worker_data = major_reset_worker_data;
#else
collector->is_parallel = FALSE;
+#endif
+#ifdef SGEN_CONCURRENT_MARK
+ collector->is_concurrent = TRUE;
+#else
+ collector->is_concurrent = FALSE;
#endif
collector->supports_cardtable = TRUE;
#ifdef SGEN_HAVE_CARDTABLE
collector->scan_card_table = major_scan_card_table;
collector->iterate_live_block_ranges = (void*)(void*) major_iterate_live_block_ranges;
+#ifdef SGEN_CONCURRENT_MARK
+ collector->update_cardtable_mod_union = update_cardtable_mod_union;
+#endif
#endif
collector->init_to_space = major_init_to_space;
collector->sweep = major_sweep;
collector->major_ops.copy_or_mark_object = major_copy_or_mark_object;
collector->major_ops.scan_object = major_scan_object;
+#ifdef SGEN_CONCURRENT_MARK
+ collector->major_ops.scan_vtype = major_scan_vtype;
+#endif
#ifdef SGEN_HAVE_CARDTABLE
/*cardtable requires major pages to be 8 cards aligned*/
projects / mono.git / blobdiff