Updated to fedora-glibc-20060822T0706cvs/fedora-glibc-2_4_90-23

2 files changed, 27 insertions, 2 deletions

diff --git a/malloc/arena.c b/malloc/arena.c
index 6f0a9df8f1..6f4b0c497b 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 (2 * 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 890d3669e2..02f659708d 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 512k (i.e., 1M
+     for new heaps) wastes too much address space.  */
+# if __WORDSIZE == 32
+#  define DEFAULT_MMAP_THRESHOLD_MAX (512 * 1024)
+# else
+#  define DEFAULT_MMAP_THRESHOLD_MAX (4 * 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 */
 
@@ -4055,6 +4068,8 @@ _int_malloc(mstate av, size_t bytes)
 
   for(;;) {
 
+    int iters = 0;
+    bool any_larger = false;
     while ( (victim = unsorted_chunks(av)->bk) != unsorted_chunks(av)) {
       bck = victim->bk;
       if (__builtin_expect (victim->size <= 2 * SIZE_SZ, 0)
@@ -4150,6 +4165,12 @@ _int_malloc(mstate av, size_t bytes)
       victim->fd = fwd;
       fwd->bk = victim;
       bck->fd = victim;
+
+      if (size >= nb)
+	any_larger = true;
+#define MAX_ITERS	10000
+      if (++iters >= MAX_ITERS)
+	break;
     }
 
     /*