[pypy-commit] stmgc default: fix to make small old objs survive major gc

[Raemi]

Author: Remi Meier <remi.me...@inf.ethz.ch>
Branch: 
Changeset: r1633:dbbeeda92d3e
Date: 2015-02-18 10:30 +0100
http://bitbucket.org/pypy/stmgc/changeset/dbbeeda92d3e/

Log:    fix to make small old objs survive major gc

diff --git a/c8/stm/core.c b/c8/stm/core.c
--- a/c8/stm/core.c
+++ b/c8/stm/core.c
@@ -228,14 +228,14 @@
         addr >= stm_object_pages+TOTAL_MEMORY) {
         /* actual segfault, unrelated to stmgc */
         fprintf(stderr, "Segmentation fault: accessing %p\n", addr);
-        abort();
+        raise(SIGINT);
     }
 
     int segnum = get_segment_of_linear_address(addr);
     if (segnum != STM_SEGMENT->segment_num) {
         fprintf(stderr, "Segmentation fault: accessing %p (seg %d) from"
                 " seg %d\n", addr, segnum, STM_SEGMENT->segment_num);
-        abort();
+        raise(SIGINT);
     }
     dprintf(("-> segment: %d\n", segnum));
 
@@ -244,7 +244,7 @@
     if (pagenum < END_NURSERY_PAGE) {
         fprintf(stderr, "Segmentation fault: accessing %p (seg %d "
                         "page %lu)\n", addr, segnum, pagenum);
-        abort();
+        raise(SIGINT);
     }
 
     DEBUG_EXPECT_SEGFAULT(false);
diff --git a/c8/stm/gcpage.c b/c8/stm/gcpage.c
--- a/c8/stm/gcpage.c
+++ b/c8/stm/gcpage.c
@@ -2,7 +2,6 @@
 # error "must be compiled via stmgc.c"
 #endif
 
-static struct list_s *testing_prebuilt_objs = NULL;
 static struct tree_s *tree_prebuilt_objs = NULL;     /* XXX refactor */
 
 
@@ -446,7 +445,7 @@
                 assert(realobj = (struct 
object_s*)REAL_ADDRESS(pseg->pub.segment_base, item));
                 assert(realobj->stm_flags & GCFLAG_WB_EXECUTED);
 
-                /* clear VISITED and ensure WB_EXECUTED in seg0 */
+                /* clear VISITED (garbage) and ensure WB_EXECUTED in seg0 */
                 mark_visited_test_and_clear(item);
                 realobj = (struct object_s*)REAL_ADDRESS(stm_object_pages, 
item);
                 realobj->stm_flags |= GCFLAG_WB_EXECUTED;
diff --git a/c8/stm/gcpage.h b/c8/stm/gcpage.h
--- a/c8/stm/gcpage.h
+++ b/c8/stm/gcpage.h
@@ -8,7 +8,7 @@
 #define GC_MAJOR_COLLECT       1.82
 
 
-
+static struct list_s *testing_prebuilt_objs;
 static char *uninitialized_page_start;   /* within segment 0 */
 static char *uninitialized_page_stop;
 
diff --git a/c8/stm/smallmalloc.c b/c8/stm/smallmalloc.c
--- a/c8/stm/smallmalloc.c
+++ b/c8/stm/smallmalloc.c
@@ -196,6 +196,10 @@
     memset(REAL_ADDRESS(STM_SEGMENT->segment_base, o), 0, size_rounded_up);
     o->stm_flags = GCFLAG_WRITE_BARRIER;
 
+    if (testing_prebuilt_objs == NULL)
+        testing_prebuilt_objs = list_create();
+    LIST_APPEND(testing_prebuilt_objs, o);
+
     dprintf(("_stm_allocate_old_small(%lu): %p, seg=%d, page=%lu\n",
              size_rounded_up, p,
              get_segment_of_linear_address(stm_object_pages + (uintptr_t)p),
@@ -204,6 +208,7 @@
     return o;
 }
 
+
 /************************************************************/
 
 static inline bool _smallmalloc_sweep_keep(char *p)
diff --git a/c8/test/test_gcpage.py b/c8/test/test_gcpage.py
--- a/c8/test/test_gcpage.py
+++ b/c8/test/test_gcpage.py
@@ -466,3 +466,10 @@
         stm_major_collect()
         stm_major_collect()
         self.commit_transaction()
+
+    def test_small_old_surives_major(self):
+        s = stm_allocate_old_small(16)
+        self.start_transaction()
+        stm_major_collect()
+        assert stm_get_char(s) == '\0'
+        self.commit_transaction()
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