[pypy-commit] stmgc c7-refactor: Align nursery sections

[arigo]

Author: Armin Rigo <arigo at tunes.org>
Branch: c7-refactor
Changeset: r722:f4d87872cb45
Date: 2014-02-10 19:46 +0100
http://bitbucket.org/pypy/stmgc/changeset/f4d87872cb45/

Log:	Align nursery sections

diff --git a/c7/stm/nursery.c b/c7/stm/nursery.c
--- a/c7/stm/nursery.c
+++ b/c7/stm/nursery.c
@@ -19,6 +19,9 @@
    then they might be allocted outside sections but still in the nursery. */
 #define MEDIUM_OBJECT         (9*1024)
 
+/* size in bytes of the alignment of any section requested */
+#define NURSERY_ALIGNMENT     64
+
 /************************************************************/
 
 static union {
@@ -44,9 +47,13 @@
 }
 
 
+#define NURSERY_ALIGN(bytes)  \
+    (((bytes) + NURSERY_ALIGNMENT - 1) & ~(NURSERY_ALIGNMENT - 1))
+
 static stm_char *allocate_from_nursery(uint64_t bytes)
 {
     /* thread-safe; allocate a chunk of memory from the nursery */
+    bytes = NURSERY_ALIGN(bytes);
     uint64_t p = __sync_fetch_and_add(&nursery_ctl.used, bytes);
     if (p + bytes > NURSERY_SIZE) {
         //major_collection();