Rework malloc. The new default implementation is based on dlmalloc from Doug

Lea.  It is about 2x faster than the old malloc-930716, and behave itself much
better -- it will properly release memory back to the system, and it uses a
combination of brk() for small allocations and mmap() for larger allocations.
 -Erik

1 files changed, 64 insertions, 0 deletions

diff --git a/libc/stdlib/malloc-standard/mallopt.c b/libc/stdlib/malloc-standard/mallopt.c
new file mode 100644
index 000000000..e28792099
--- /dev/null
+++ b/libc/stdlib/malloc-standard/mallopt.c
@@ -0,0 +1,64 @@
+/*
+  This is a version (aka dlmalloc) of malloc/free/realloc written by
+  Doug Lea and released to the public domain.  Use, modify, and
+  redistribute this code without permission or acknowledgement in any
+  way you wish.  Send questions, comments, complaints, performance
+  data, etc to dl@cs.oswego.edu
+
+  VERSION 2.7.2 Sat Aug 17 09:07:30 2002  Doug Lea  (dl at gee)
+
+  Note: There may be an updated version of this malloc obtainable at
+           ftp://gee.cs.oswego.edu/pub/misc/malloc.c
+  Check before installing!
+
+  Hacked up for uClibc by Erik Andersen <andersen@codepoet.org>
+*/
+
+#include "malloc.h"
+
+
+/* ------------------------------ mallopt ------------------------------ */
+int mallopt(int param_number, int value)
+{
+    int ret;
+    mstate av;
+
+    ret = 0;
+
+    LOCK;
+    av = get_malloc_state();
+    /* Ensure initialization/consolidation */
+    __malloc_consolidate(av);
+
+    switch(param_number) {
+	case M_MXFAST:
+	    if (value >= 0 && value <= MAX_FAST_SIZE) {
+		set_max_fast(av, value);
+		ret = 1;
+	    }
+	    break;
+
+	case M_TRIM_THRESHOLD:
+	    av->trim_threshold = value;
+	    ret = 1;
+	    break;
+
+	case M_TOP_PAD:
+	    av->top_pad = value;
+	    ret = 1;
+	    break;
+
+	case M_MMAP_THRESHOLD:
+	    av->mmap_threshold = value;
+	    ret = 1;
+	    break;
+
+	case M_MMAP_MAX:
+	    av->n_mmaps_max = value;
+	    ret = 1;
+	    break;
+    }
+    UNLOCK;
+    return ret;
+}
+