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-rw-r--r--libc/stdlib/malloc/malloc.h10
1 files changed, 8 insertions, 2 deletions
diff --git a/libc/stdlib/malloc/malloc.h b/libc/stdlib/malloc/malloc.h
index 193dabd64..cc2bf35ba 100644
--- a/libc/stdlib/malloc/malloc.h
+++ b/libc/stdlib/malloc/malloc.h
@@ -32,6 +32,12 @@
MALLOC_MIN_SIZE, will cause us not to reserve anything. */
#define MALLOC_MIN_SIZE (2*MALLOC_PAGE_SIZE)
+/* When realloc shrinks an allocation, it only does so if more than this
+ many bytes will be freed; it must at at least HEAP_MIN_SIZE. Larger
+ values increase speed (by reducing heap fragmentation) at the expense of
+ space. */
+#define MALLOC_REALLOC_MIN_FREE_SIZE (HEAP_MIN_SIZE + 16)
+
/* For systems with an MMU, use sbrk to map/unmap memory for the malloc
heap, instead of mmap/munmap. This is a tradeoff -- sbrk is faster than
@@ -103,8 +109,8 @@ extern malloc_mutex_t __malloc_sbrk_lock;
#endif /* __UCLIBC_HAS_THREADS__ */
-/* Change this to `#if 1' to cause malloc to emit debugging info to stderr. */
-#if 0
+/* Define MALLOC_DEBUGGING to cause malloc to emit debugging info to stderr. */
+#ifdef MALLOC_DEBUGGING
#include <stdio.h>
#define MALLOC_DEBUG(fmt, args...) fprintf (stderr, fmt , ##args)
#else