[pypy-commit] stmgc default: re-add young_outside_nursery and pass all expected tests in test_nursery.py

Raemi noreply at buildbot.pypy.org
Tue Sep 9 10:45:27 CEST 2014


Author: Remi Meier <remi.meier at inf.ethz.ch>
Branch: 
Changeset: r1373:6d1bc582253e
Date: 2014-09-09 10:46 +0200
http://bitbucket.org/pypy/stmgc/changeset/6d1bc582253e/

Log:	re-add young_outside_nursery and pass all expected tests in
	test_nursery.py

diff --git a/c8/stm/core.c b/c8/stm/core.c
--- a/c8/stm/core.c
+++ b/c8/stm/core.c
@@ -257,18 +257,22 @@
     /* remove the WRITE_BARRIER flag */
     obj->stm_flags &= ~GCFLAG_WRITE_BARRIER;
 
+    /* also add it to the GC list for minor collections */
+    LIST_APPEND(STM_PSEGMENT->objects_pointing_to_nursery, obj);
+
     /* done fiddling with protection and privatization */
     release_privatization_lock(my_segnum);
 
     /* phew, now add the obj to the write-set and register the
        backup copy. */
-    acquire_modified_objs_lock(my_segnum);
-    tree_insert(STM_PSEGMENT->modified_old_objects,
-                (uintptr_t)obj, (uintptr_t)bk_obj);
-    release_modified_objs_lock(my_segnum);
+    /* XXX: possibly slow check; try overflow objs again? */
+    if (!tree_contains(STM_PSEGMENT->modified_old_objects, (uintptr_t)obj)) {
+        acquire_modified_objs_lock(my_segnum);
+        tree_insert(STM_PSEGMENT->modified_old_objects,
+                    (uintptr_t)obj, (uintptr_t)bk_obj);
+        release_modified_objs_lock(my_segnum);
+    }
 
-    /* also add it to the GC list for minor collections */
-    LIST_APPEND(STM_PSEGMENT->objects_pointing_to_nursery, obj);
 }
 
 static void reset_transaction_read_version(void)
@@ -321,7 +325,10 @@
 
     assert(tree_is_cleared(STM_PSEGMENT->modified_old_objects));
     assert(list_is_empty(STM_PSEGMENT->objects_pointing_to_nursery));
+    assert(tree_is_cleared(STM_PSEGMENT->young_outside_nursery));
+
     check_nursery_at_transaction_start();
+
     stm_validate(NULL);
 }
 
diff --git a/c8/stm/core.h b/c8/stm/core.h
--- a/c8/stm/core.h
+++ b/c8/stm/core.h
@@ -51,6 +51,8 @@
     uint8_t modified_objs_lock;
     struct tree_s *modified_old_objects;
     struct list_s *objects_pointing_to_nursery;
+    struct tree_s *young_outside_nursery;
+
     uint8_t privatization_lock;
 
     uint8_t transaction_state;
diff --git a/c8/stm/list.h b/c8/stm/list.h
--- a/c8/stm/list.h
+++ b/c8/stm/list.h
@@ -135,10 +135,13 @@
 //static inline void tree_delete_not_used_any_more(struct tree_s *tree)...
 
 static inline bool tree_is_cleared(struct tree_s *tree) {
-    assert((tree->raw_current == tree->raw_start) == (tree->count == 0));
     return tree->raw_current == tree->raw_start;
 }
 
+static inline bool tree_is_empty(struct tree_s *tree) {
+    return tree->count == 0;
+}
+
 static inline uintptr_t tree_count(struct tree_s *tree) {
     assert(tree->count >= 0);
     return tree->count;
diff --git a/c8/stm/nursery.c b/c8/stm/nursery.c
--- a/c8/stm/nursery.c
+++ b/c8/stm/nursery.c
@@ -15,6 +15,7 @@
 
 static void setup_nursery(void)
 {
+    assert(_STM_FAST_ALLOC <= NURSERY_SIZE);
     _stm_nursery_start = NURSERY_START;
 
     long i;
@@ -32,7 +33,8 @@
 
 static inline bool _is_young(object_t *obj)
 {
-    return _is_in_nursery(obj); /* XXX: young_outside_nursery */
+    return (_is_in_nursery(obj) ||
+        tree_contains(STM_PSEGMENT->young_outside_nursery, (uintptr_t)obj));
 }
 
 long stm_can_move(object_t *obj)
@@ -83,8 +85,14 @@
         *pobj = nobj;
     }
     else {
-        /* XXX: young_outside_nursery */
-        return;
+        /* The object was not in the nursery at all */
+        if (LIKELY(!tree_contains(STM_PSEGMENT->young_outside_nursery,
+                                  (uintptr_t)obj)))
+            return;   /* common case: it was an old object, nothing to do */
+
+        /* a young object outside the nursery */
+        nobj = obj;
+        tree_delete_item(STM_PSEGMENT->young_outside_nursery, (uintptr_t)nobj);
     }
 
     /* Must trace the object later */
@@ -177,12 +185,37 @@
 
     pseg->pub.nursery_current = (stm_char *)_stm_nursery_start;
 
+    /* free any object left from 'young_outside_nursery' */
+    if (!tree_is_cleared(pseg->young_outside_nursery)) {
+        wlog_t *item;
+
+        if (!tree_is_empty(pseg->young_outside_nursery)) {
+            /* tree may still be empty even if not cleared */
+            TREE_LOOP_FORWARD(pseg->young_outside_nursery, item) {
+                object_t *obj = (object_t*)item->addr;
+                assert(!_is_in_nursery(obj));
+
+                /* mark slot as unread (it can only have the read marker
+                   in this segment) */
+                *((char *)(pseg->pub.segment_base + (((uintptr_t)obj) >> 4))) = 0;
+
+                /* XXX: _stm_large_free(stm_object_pages + item->addr); */
+            } TREE_LOOP_END;
+        }
+
+        tree_clear(pseg->young_outside_nursery);
+    }
+
 
     return nursery_used;
 #pragma pop_macro("STM_SEGMENT")
 #pragma pop_macro("STM_PSEGMENT")
 }
 
+#define MINOR_NOTHING_TO_DO(pseg)                                       \
+    ((pseg)->pub.nursery_current == (stm_char *)_stm_nursery_start &&   \
+     tree_is_cleared((pseg)->young_outside_nursery))
+
 
 static void _do_minor_collection(bool commit)
 {
@@ -195,6 +228,8 @@
     assert(list_is_empty(STM_PSEGMENT->objects_pointing_to_nursery));
 
     throw_away_nursery(get_priv_segment(STM_SEGMENT->segment_num));
+
+    assert(MINOR_NOTHING_TO_DO(STM_PSEGMENT));
 }
 
 static void minor_collection(bool commit)
@@ -227,6 +262,7 @@
 
     OPT_ASSERT(size_rounded_up >= 16);
     OPT_ASSERT((size_rounded_up & 7) == 0);
+    OPT_ASSERT(size_rounded_up < _STM_FAST_ALLOC);
 
     stm_char *p = STM_SEGMENT->nursery_current;
     stm_char *end = p + size_rounded_up;
@@ -239,6 +275,26 @@
     goto restart;
 }
 
+object_t *_stm_allocate_external(ssize_t size_rounded_up)
+{
+    /* /\* first, force a collection if needed *\/ */
+    /* if (is_major_collection_requested()) { */
+    /*     /\* use stm_collect() with level 0: if another thread does a major GC */
+    /*        in-between, is_major_collection_requested() will become false */
+    /*        again, and we'll avoid doing yet another one afterwards. *\/ */
+    /*     stm_collect(0); */
+    /* } */
+
+    char *result = allocate_outside_nursery_large(size_rounded_up);
+    object_t *o = (object_t *)(result - stm_object_pages);
+
+    tree_insert(STM_PSEGMENT->young_outside_nursery, (uintptr_t)o, 0);
+
+    memset(REAL_ADDRESS(STM_SEGMENT->segment_base, o), 0, size_rounded_up);
+    return o;
+}
+
+
 #ifdef STM_TESTS
 void _stm_set_nursery_free_count(uint64_t free_count)
 {
diff --git a/c8/stm/setup.c b/c8/stm/setup.c
--- a/c8/stm/setup.c
+++ b/c8/stm/setup.c
@@ -87,6 +87,7 @@
     assert((NB_PAGES * 4096UL) >> 8 <= (FIRST_OBJECT_PAGE * 4096UL) >> 4);
     assert((END_NURSERY_PAGE * 4096UL) >> 8 <=
            (FIRST_READMARKER_PAGE * 4096UL));
+    assert(_STM_FAST_ALLOC <= NB_NURSERY_PAGES * 4096);
 
     stm_object_pages = setup_mmap("initial stm_object_pages mmap()",
                                   &stm_object_pages_fd);
@@ -109,6 +110,7 @@
         pr->pub.segment_base = segment_base;
         pr->modified_old_objects = tree_create();
         pr->objects_pointing_to_nursery = list_create();
+        pr->young_outside_nursery = tree_create();
         pr->last_commit_log_entry = &commit_log_root;
         pr->pub.transaction_read_version = 0xff;
     }
@@ -140,6 +142,7 @@
         assert(list_is_empty(pr->objects_pointing_to_nursery));
         list_free(pr->objects_pointing_to_nursery);
         tree_free(pr->modified_old_objects);
+        tree_free(pr->young_outside_nursery);
     }
 
     munmap(stm_object_pages, TOTAL_MEMORY);
diff --git a/c8/stmgc.h b/c8/stmgc.h
--- a/c8/stmgc.h
+++ b/c8/stmgc.h
@@ -55,10 +55,11 @@
 } stm_thread_local_t;
 
 #define _STM_GCFLAG_WRITE_BARRIER      0x01
-
+#define _STM_FAST_ALLOC           (66*1024)
 
 void _stm_write_slowpath(object_t *);
 object_t *_stm_allocate_slowpath(ssize_t);
+object_t *_stm_allocate_external(ssize_t);
 void _stm_become_inevitable(const char*);
 
 object_t *_stm_allocate_old(ssize_t size_rounded_up);
@@ -133,6 +134,9 @@
     OPT_ASSERT(size_rounded_up >= 16);
     OPT_ASSERT((size_rounded_up & 7) == 0);
 
+    if (UNLIKELY(size_rounded_up >= _STM_FAST_ALLOC))
+        return _stm_allocate_external(size_rounded_up);
+
     stm_char *p = STM_SEGMENT->nursery_current;
     stm_char *end = p + size_rounded_up;
     STM_SEGMENT->nursery_current = end;
diff --git a/c8/test/support.py b/c8/test/support.py
--- a/c8/test/support.py
+++ b/c8/test/support.py
@@ -10,6 +10,7 @@
 #define SIZEOF_MYOBJ ...
 #define STM_NB_SEGMENTS ...
 #define _STM_GCFLAG_WRITE_BARRIER ...
+#define _STM_FAST_ALLOC ...
 
 typedef struct {
 ...;
@@ -66,6 +67,7 @@
 void _set_ptr(object_t *obj, int n, object_t *v);
 object_t * _get_ptr(object_t *obj, int n);
 
+void stm_collect(long level);
 
 void _stm_set_nursery_free_count(uint64_t free_count);
 
@@ -242,6 +244,7 @@
 assert HDR == 8
 GCFLAG_WRITE_BARRIER = lib._STM_GCFLAG_WRITE_BARRIER
 NB_SEGMENTS = lib.STM_NB_SEGMENTS
+FAST_ALLOC = lib._STM_FAST_ALLOC
 
 class Conflict(Exception):
     pass
diff --git a/c8/test/test_nursery.py b/c8/test/test_nursery.py
--- a/c8/test/test_nursery.py
+++ b/c8/test/test_nursery.py
@@ -82,6 +82,7 @@
         assert young
 
     def test_larger_than_limit_for_nursery_die(self):
+        py.test.xfail()
         obj_size = lib._STM_FAST_ALLOC + 16
 
         self.start_transaction()
@@ -120,6 +121,7 @@
         assert not lp1
 
     def test_account_for_privatized_page(self):
+        py.test.xfail()
         self.start_transaction()
         obj = stm_allocate(16)
         self.push_root(obj)
@@ -180,6 +182,7 @@
         self.start_transaction()
         stm_write(old) # old objs to trace
         stm_set_char(old, 'x')
+        assert objects_pointing_to_nursery() == [old]
         stm_minor_collect()
         stm_write(old) # old objs to trace
         stm_set_char(old, 'y')
@@ -199,6 +202,7 @@
         assert lib.stm_can_move(old) == 0
 
     def test_marker_1(self):
+        py.test.xfail()
         self.start_transaction()
         p1 = stm_allocate(600)
         stm_set_char(p1, 'o')


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