Author: wenzhuman <manwen...@gmail.com>
Branch: gc-two-end-nursery
Changeset: r72027:46de6de2efd2
Date: 2014-06-11 16:38 -0400
http://bitbucket.org/pypy/pypy/changeset/46de6de2efd2/
Log: add malloc_fixed() for obj that don't need zeroing memory before
allocation
diff --git a/rpython/memory/gc/incminimark.py b/rpython/memory/gc/incminimark.py
--- a/rpython/memory/gc/incminimark.py
+++ b/rpython/memory/gc/incminimark.py
@@ -291,7 +291,23 @@
self.nursery = NULL
self.nursery_free = NULL
self.nursery_top = NULL
- self.nursery_real_top = NULL
+ # _______ nursery ________________
+ # / \
+ # first-part second-part
+ # +----------------------------------+
+ # | | | | | | | | |
+ # | | | | | | | | |
+ # |o|o|o|o| | |o|o|
+ # |b|b|b|b|zeroed|non-zeroed mem |b|b|
+ # |j|j|j|j|---> | <-------|j|j|
+ # | | | | | | | | |
+ # +--------------+-------------------+
+ # ^ ^ ^ ^
+ # free top free real-top
+ #new:add the pointer for objects don't need zero memory before
allocation
+ self.nursery_second_part_free = NULL
+ self.nursery_second_part_top = NULL
+ self.nursery_real_top = NULL
self.debug_tiny_nursery = -1
self.debug_rotating_nurseries = lltype.nullptr(NURSARRAY)
self.extra_threshold = 0
@@ -464,6 +480,8 @@
# the end of the nursery:
self.nursery_top = self.nursery + self.nursery_size
self.nursery_real_top = self.nursery_top
+ self.nursery_second_part_free = self.nursery_real_top
+ self.nursery_second_part_top = self.nursery_top
# initialize the threshold
self.min_heap_size = max(self.min_heap_size, self.nursery_size *
self.major_collection_threshold)
@@ -596,6 +614,31 @@
#
return llmemory.cast_adr_to_ptr(obj, llmemory.GCREF)
+ def malloc_fixedsize(self, typeid, length, size,
+ needs_finalizer=False,
+ is_finalizer_light=False,
+ contains_weakptr=False):
+ size_gc_header = self.gcheaderbuilder.size_gc_header
+ totalsize = size_gc_header + size
+ rawtotalsize = raw_malloc_usage(totalsize)
+ min_size = raw_malloc_usage(self.minimal_size_in_nursery)
+ if rawtotalsize < min_size:
+ #round up the raw totalsize to min_size
+ totalsize = rawtotalsize = min_size
+ result = self.nursery_second_part_free
+
+ #allocate the obj in the opposite direction as obj in
malloc_fixedsize_clear()
+ self.nursery_second_part_free = result - totalsize
+ #make sure the new object won't overwrite existing objects
+ if self.nursery_second_part_free < self.nursery_free:
+ ##TODO:deal with different GC states
+ result = self.minor_collection()
+ #move the pointer
+ result -= totalsize
+ llarena.arena_reserve(result, totalsize)
+ #real object beginning address
+ obj = result + size_gc_header
+ return llmemory.cast_adr_to_ptr(obj, llmemory.GCREF)
def malloc_varsize_clear(self, typeid, length, size, itemsize,
offset_to_length):
@@ -671,6 +714,7 @@
"totalsize > nursery_cleanup")
llarena.arena_reset(self.nursery_top, size, 2)
self.nursery_top += size
+ self.nursery_second_part_top = self.nursery_top
move_nursery_top._always_inline_ = True
def collect_and_reserve(self, prev_result, totalsize):
@@ -1457,6 +1501,8 @@
self.nursery_free = self.nursery
self.nursery_top = self.nursery + self.initial_cleanup
self.nursery_real_top = self.nursery + self.nursery_size
+ self.nursery_second_part_free = self.nursery_real_top
+ self.nursery_second_part_top = self.nursery_top
#
debug_print("minor collect, total memory used:",
self.get_total_memory_used())
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