procfs: add memdump interface to dump used/free memory info

usage:echo <used/free> > /proc/memdump
echo used > /proc/memdump // output all used memory node info(address + size)
echo free > /proc/memdump // output all free memory node info(address + size)

Signed-off-by: Jiuzhu Dong <dongjiuzhu1@xiaomi.com>

mm/mm_heap/Make.defs

@@ -25,7 +25,7 @@ ifeq ($(CONFIG_MM_DEFAULT_MANAGER),y)
 CSRCS += mm_initialize.c mm_sem.c mm_addfreechunk.c mm_size2ndx.c
 CSRCS += mm_malloc_size.c mm_shrinkchunk.c mm_brkaddr.c mm_calloc.c
 CSRCS += mm_extend.c mm_free.c mm_mallinfo.c mm_malloc.c mm_foreach.c
-CSRCS += mm_memalign.c mm_realloc.c mm_zalloc.c mm_heapmember.c
+CSRCS += mm_memalign.c mm_realloc.c mm_zalloc.c mm_heapmember.c mm_memdump.c
 
 ifeq ($(CONFIG_DEBUG_MM),y)
 CSRCS += mm_checkcorruption.c

mm/mm_heap/mm_memdump.c

@@ -0,0 +1,121 @@
+/****************************************************************************
+ * mm/mm_heap/mm_memdump.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdio.h>
+#include <malloc.h>
+#include <assert.h>
+#include <debug.h>
+
+#include <nuttx/mm/mm.h>
+
+#include "mm_heap/mm.h"
+
+struct memdump_info_s
+{
+  pid_t pid;
+  int   blks;
+  int   size;
+};
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+static void memdump_handler(FAR struct mm_allocnode_s *node, FAR void *arg)
+{
+  FAR struct memdump_info_s *info = arg;
+
+  if ((node->preceding & MM_ALLOC_BIT) != 0)
+    {
+      DEBUGASSERT(node->size >= SIZEOF_MM_ALLOCNODE);
+      if (info->pid == -1)
+        {
+          info->blks++;
+          info->size += node->size;
+          syslog(LOG_INFO, "%12p%12" PRIu32 "\n",
+                 ((FAR char *)node + SIZEOF_MM_ALLOCNODE),
+                 node->size);
+        }
+    }
+  else
+    {
+      FAR struct mm_freenode_s *fnode = (FAR void *)node;
+
+      DEBUGASSERT(node->size >= SIZEOF_MM_FREENODE);
+      DEBUGASSERT(fnode->blink->flink == fnode);
+      DEBUGASSERT(fnode->blink->size <= fnode->size);
+      DEBUGASSERT(fnode->flink == NULL ||
+                  fnode->flink->blink == fnode);
+      DEBUGASSERT(fnode->flink == NULL ||
+                  fnode->flink->size == 0 ||
+                  fnode->flink->size >= fnode->size);
+
+      if (info->pid == -2)
+        {
+          info->blks++;
+          info->size += node->size;
+          syslog(LOG_INFO, "%12p%12" PRIu32 "\n",
+                 ((FAR char *)node + SIZEOF_MM_ALLOCNODE),
+                 node->size);
+        }
+    }
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: mm_memdump
+ *
+ * Description:
+ *   mm_memdump returns a memory info about specified pid of task/thread.
+ *
+ ****************************************************************************/
+
+void mm_memdump(FAR struct mm_heap_s *heap, pid_t pid)
+{
+  struct memdump_info_s info;
+
+  if (pid == -1)
+    {
+      syslog(LOG_INFO, "Dump all used memory node info:\n");
+    }
+  else if (pid == -2)
+    {
+      syslog(LOG_INFO, "Dump all free memory node info:\n");
+    }
+
+  syslog(LOG_INFO, "%12s%12s\n", "Address", "Size");
+
+  info.blks = 0;
+  info.size = 0;
+  info.pid  = pid;
+  mm_foreach(heap, memdump_handler, &info);
+
+  syslog(LOG_INFO, "%12s%12s\n", "Total Blks", "Total Size");
+  syslog(LOG_INFO, "%12d%12d\n", info.blks, info.size);
+}