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authorUlrich Drepper <drepper@redhat.com>2006-08-22 06:19:12 +0000
committerUlrich Drepper <drepper@redhat.com>2006-08-22 06:19:12 +0000
commite404fb16fc35210219159a446f7c993760a37316 (patch)
treeb111528ec288146613b4cac260bb58372ed47da5 /malloc
parent376e973ad66993e7b5dbdfd173c399e1af3a1add (diff)
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* malloc/malloc.c (DEFAULT_MMAP_THRESHOLD_MAX): For 32-bit
	platforms define as 1MB.  For 64-bit platforms as 32MB.  The lower
	limit is needed to avoid the exploding of the address space
	requirement for secondary heaps.
	* malloc/arena.c (HEAP_MAX_SIZE): Define using
	DEFAULT_MMAP_THRESHOLD_MAX if it is defined.
Diffstat (limited to 'malloc')
-rw-r--r--malloc/arena.c6
-rw-r--r--malloc/malloc.c15
2 files changed, 19 insertions, 2 deletions
diff --git a/malloc/arena.c b/malloc/arena.c
index 6f0a9df8f1..e96b3b42a6 100644
--- a/malloc/arena.c
+++ b/malloc/arena.c
@@ -24,7 +24,11 @@
 
 #define HEAP_MIN_SIZE (32*1024)
 #ifndef HEAP_MAX_SIZE
-#define HEAP_MAX_SIZE (1024*1024) /* must be a power of two */
+# ifdef DEFAULT_MMAP_THRESHOLD_MAX
+#  define HEAP_MAX_SIZE DEFAULT_MMAP_THRESHOLD_MAX
+# else
+#  define HEAP_MAX_SIZE (1024*1024) /* must be a power of two */
+# endif
 #endif
 
 /* HEAP_MIN_SIZE and HEAP_MAX_SIZE limit the size of mmap()ed heaps
diff --git a/malloc/malloc.c b/malloc/malloc.c
index b1f813efbe..7ad26af069 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -259,6 +259,7 @@
 
 #ifdef _LIBC
 #include <stdio-common/_itoa.h>
+#include <bits/wordsize.h>
 #endif
 
 #ifdef __cplusplus
@@ -1424,7 +1425,15 @@ int      __posix_memalign(void **, size_t, size_t);
 #endif
 
 #ifndef DEFAULT_MMAP_THRESHOLD_MAX
-#define DEFAULT_MMAP_THRESHOLD_MAX (8 * 1024 * 1024 * sizeof(long))
+  /* For 32-bit platforms we cannot increase the maximum mmap
+     threshold much because it is also the minimum value for the
+     maximum heap size and its alignment.  Going above 1MB wastes too
+     much address space.  */
+# if __WORDSIZE == 32
+#  define DEFAULT_MMAP_THRESHOLD_MAX (1024 * 1024)
+# else
+#  define DEFAULT_MMAP_THRESHOLD_MAX (8 * 1024 * 1024 * sizeof(long))
+# endif
 #endif
 
 /*
@@ -2867,6 +2876,7 @@ static Void_t* sYSMALLOc(nb, av) INTERNAL_SIZE_T nb; mstate av;
 
     char* mm;             /* return value from mmap call*/
 
+  try_mmap:
     /*
       Round up size to nearest page.  For mmapped chunks, the overhead
       is one SIZE_SZ unit larger than for normal chunks, because there
@@ -2996,6 +3006,9 @@ static Void_t* sYSMALLOc(nb, av) INTERNAL_SIZE_T nb; mstate av;
 	set_foot(old_top, (old_size + 2*SIZE_SZ));
       }
     }
+    else
+      /* We can at least try to use to mmap memory.  */
+      goto try_mmap;
 
   } else { /* av == main_arena */