[MALLOC_DEBUG]: Keep track of current maximum number of mmaps. n_mmap…

…s_max is the target.

malloc/arena.c

@@ -370,6 +370,9 @@ ptmalloc_init_minimal (void)
   mp_.top_pad        = DEFAULT_TOP_PAD;
 #endif
   mp_.n_mmaps_max    = DEFAULT_MMAP_MAX;
+#if MALLOC_DEBUG
+  mp_.n_mmaps_cmax   = DEFAULT_MMAP_MAX;
+#endif
   mp_.mmap_threshold = DEFAULT_MMAP_THRESHOLD;
   mp_.trim_threshold = DEFAULT_TRIM_THRESHOLD;
   mp_.pagesize       = malloc_getpagesize;

malloc/hooks.c

@@ -1,5 +1,5 @@
 /* Malloc implementation for multiple threads without lock contention.
-   Copyright (C) 2001,2002,2003,2004,2005,2006 Free Software Foundation, Inc.
+   Copyright (C) 2001-2006, 2007 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Wolfram Gloger <wg@malloc.de>, 2001.
 
@@ -507,6 +507,9 @@ struct malloc_save_state {
   unsigned long trim_threshold;
   unsigned long top_pad;
   unsigned int  n_mmaps_max;
+#if MALLOC_DEBUG
+  unsigned int  n_mmaps_cmax;
+#endif
   unsigned long mmap_threshold;
   int           check_action;
   unsigned long max_sbrked_mem;
@@ -550,6 +553,9 @@ public_gET_STATe(void)
   ms->trim_threshold = mp_.trim_threshold;
   ms->top_pad = mp_.top_pad;
   ms->n_mmaps_max = mp_.n_mmaps_max;
+#if MALLOC_DEBUG
+  ms->n_mmaps_cmax = mp_.n_mmaps_cmax;
+#endif
   ms->mmap_threshold = mp_.mmap_threshold;
   ms->check_action = check_action;
   ms->max_sbrked_mem = main_arena.max_system_mem;
@@ -621,6 +627,9 @@ public_sET_STATe(Void_t* msptr)
   mp_.trim_threshold = ms->trim_threshold;
   mp_.top_pad = ms->top_pad;
   mp_.n_mmaps_max = ms->n_mmaps_max;
+#if MALLOC_DEBUG
+  mp_.n_mmaps_cmax = ms->n_mmaps_cmax;
+#endif
   mp_.mmap_threshold = ms->mmap_threshold;
   check_action = ms->check_action;
   main_arena.max_system_mem = ms->max_sbrked_mem;

malloc/malloc.c

@@ -2343,6 +2343,9 @@ struct malloc_par {
   /* Memory map support */
   int              n_mmaps;
   int              n_mmaps_max;
+#if MALLOC_DEBUG
+  int              n_mmaps_cmax;
+#endif
   int              max_n_mmaps;
   /* the mmap_threshold is dynamic, until the user sets
      it manually, at which point we need to disable any
@@ -2858,7 +2861,8 @@ static void do_check_malloc_state(mstate av)
   assert(total <= (unsigned long)(mp_.max_total_mem));
   assert(mp_.n_mmaps >= 0);
 #endif
-  assert(mp_.n_mmaps <= mp_.n_mmaps_max);
+  assert(mp_.n_mmaps <= mp_.n_mmaps_cmax);
+  assert(mp_.n_mmaps_max <= mp_.n_mmaps_cmax);
   assert(mp_.n_mmaps <= mp_.max_n_mmaps);
 
   assert((unsigned long)(av->system_mem) <=
@@ -3456,6 +3460,13 @@ munmap_chunk(p) mchunkptr p;
     }
 
   mp_.n_mmaps--;
+#if MALLOC_DEBUG
+  if (mp_.n_mmaps_cmax > mp_.n_mmaps_max)
+    {
+      assert (mp_.n_mmaps_cmax == mp_.n_mmaps + 1);
+      mp_.n_mmaps_cmax = mp_.n_mmaps;
+    }
+#endif
   mp_.mmapped_mem -= total_size;
 
   int ret __attribute__ ((unused)) = munmap((char *)block, total_size);
@@ -5371,6 +5382,9 @@ mstate av; size_t n_elements; size_t* sizes; int opts; Void_t* chunks[];
   mp_.n_mmaps_max = 0;
   mem = _int_malloc(av, size);
   mp_.n_mmaps_max = mmx;   /* reset mmap */
+#if MALLOC_DEBUG
+  mp_.n_mmaps_cmax = mmx;
+#endif
   if (mem == 0)
     return 0;
 
@@ -5696,8 +5710,17 @@ int mALLOPt(param_number, value) int param_number; int value;
       res = 0;
     else
 #endif
-      mp_.n_mmaps_max = value;
-      mp_.no_dyn_threshold = 1;
+      {
+#if MALLOC_DEBUG
+	if (mp_.n_mmaps <= value)
+	  mp_.n_mmaps_cmax = value;
+	else
+	  mp_.n_mmaps_cmax = mp_.n_mmaps;
+#endif
+
+	mp_.n_mmaps_max = value;
+	mp_.no_dyn_threshold = 1;
+      }
     break;
 
   case M_CHECK_ACTION: