Author: Armin Rigo <ar...@tunes.org>
Branch:
Changeset: r179:0531f4f549cb
Date: 2013-06-17 18:19 +0200
http://bitbucket.org/pypy/stmgc/changeset/0531f4f549cb/
Log: update_next_threshold()
diff --git a/c4/gcpage.c b/c4/gcpage.c
--- a/c4/gcpage.c
+++ b/c4/gcpage.c
@@ -392,6 +392,35 @@
/***** Major collections: main *****/
+void update_next_threshold(void)
+{
+ uintptr_t free_space_in_pages, next;
+
+ /* the limit will be reached when we have allocated 0.82 times mc_total */
+ next = (uintptr_t)(mc_total_in_use * (GC_MAJOR_COLLECT-1.0));
+
+ /* this limit should be at least GC_MIN */
+ if (next < GC_MIN)
+ next = GC_MIN;
+
+ /* this difference gives the size allocated in pages but unused so far */
+ assert(mc_total_in_use <= mc_total_reserved);
+ free_space_in_pages = mc_total_reserved - mc_total_in_use;
+
+ /* decrement 'next' by this much, because it will not be accounted for */
+ if (next >= free_space_in_pages)
+ next -= free_space_in_pages;
+ else
+ next = 0;
+
+ /* allow for headroom: enforce the smallest allowed value */
+ if (next < GC_EXPAND)
+ next = GC_EXPAND;
+
+ /* done */
+ countdown_next_major_coll = next;
+}
+
void stm_major_collect(void)
{
stmgcpage_acquire_global_lock();
@@ -416,9 +445,7 @@
free_unused_global_pages();
#endif
free_closed_thread_descriptors();
-#if 0
update_next_threshold();
-#endif
fprintf(stderr, "| %lu bytes alive, %lu not used, countdown %lu\n`-----\n",
(unsigned long)mc_total_in_use,
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