diff --git a/fs/procfs/fs_procfsmeminfo.c b/fs/procfs/fs_procfsmeminfo.c
index c81df559477..824a6e5ae87 100644
--- a/fs/procfs/fs_procfsmeminfo.c
+++ b/fs/procfs/fs_procfsmeminfo.c
@@ -56,7 +56,7 @@
  * to handle the longest line generated by this logic.
  */
 
-#define MEMINFO_LINELEN 80
+#define MEMINFO_LINELEN 256
 
 /****************************************************************************
  * Private Types
@@ -404,7 +404,6 @@ static ssize_t memdump_read(FAR struct file *filep, FAR char *buffer,
   FAR struct meminfo_file_s *procfile;
   size_t linesize;
   size_t copysize;
-  size_t totalsize;
   off_t offset;
 
   finfo("buffer=%p buflen=%d\n", buffer, (int)buflen);
@@ -419,41 +418,26 @@ static ssize_t memdump_read(FAR struct file *filep, FAR char *buffer,
 
 #if CONFIG_MM_BACKTRACE >= 0
   linesize  = procfs_snprintf(procfile->line, MEMINFO_LINELEN,
-                              "usage: <pid/used/free/on/off>"
-                              "<seqmin> <seqmax> \n"
+                              "usage: <on/off/pid/used/free/leak>"
+                              "<seqmin> <seqmax>\n"
                               "on/off backtrace\n"
-                              "pid: dump pid allocated node\n");
+                              "pid: dump pid allocated node\n"
+                              "used: dump all allocated node\n"
+                              "free: dump all free node\n"
+                              "leak: dump all leaked node\n"
+                              "The current sequence number %lu\n",
+                              g_mm_seqno);
 #else
   linesize  = procfs_snprintf(procfile->line, MEMINFO_LINELEN,
-                              "usage: <used/free>\n");
+                              "usage: <used/free>\n"
+                              "used: dump all allocated node\n"
+                              "free: dump all free node\n");
 #endif
 
   copysize  = procfs_memcpy(procfile->line, linesize, buffer, buflen,
                             &offset);
-  totalsize = copysize;
-  buffer   += copysize;
-  buflen   -= copysize;
-  linesize  = procfs_snprintf(procfile->line, MEMINFO_LINELEN,
-                              "used: dump all allocated node\n"
-                              "free: dump all free node\n");
-
-  copysize = procfs_memcpy(procfile->line, linesize, buffer, buflen,
-                           &offset);
-  totalsize += copysize;
-
-#if CONFIG_MM_BACKTRACE >= 0
-  buffer    += copysize;
-  buflen    -= copysize;
-  linesize   = procfs_snprintf(procfile->line, MEMINFO_LINELEN,
-                               "The current sequence number %lu\n",
-                               g_mm_seqno);
-
-  totalsize += procfs_memcpy(procfile->line, linesize, buffer, buflen,
-                             &offset);
-#endif
-
-  filep->f_pos += totalsize;
-  return totalsize;
+  filep->f_pos += copysize;
+  return copysize;
 }
 #endif
 
@@ -556,6 +540,16 @@ static ssize_t memdump_write(FAR struct file *filep, FAR const char *buffer,
         goto dump;
 #endif
         break;
+
+      case 'l':
+        dump.pid = PID_MM_LEAK;
+
+#if CONFIG_MM_BACKTRACE >= 0
+        p = (FAR char *)buffer + 4;
+        goto dump;
+#endif
+        break;
+
 #if CONFIG_MM_BACKTRACE >= 0
       default:
         if (!isdigit(buffer[0]))
diff --git a/mm/mempool/mempool.c b/mm/mempool/mempool.c
index 47d851349cd..f97913e1a17 100644
--- a/mm/mempool/mempool.c
+++ b/mm/mempool/mempool.c
@@ -427,7 +427,7 @@ mempool_info_task(FAR struct mempool_s *pool,
                            node)
         {
           if ((task->pid == buf->pid || task->pid == PID_MM_ALLOC ||
-               (task->pid == PID_MM_LEAK && !!nxsched_get_tcb(buf->pid))) &&
+               (task->pid == PID_MM_LEAK && !nxsched_get_tcb(buf->pid))) &&
               buf->seqno >= task->seqmin && buf->seqno <= task->seqmax)
             {
               info.aordblks++;
@@ -490,7 +490,7 @@ void mempool_memdump(FAR struct mempool_s *pool,
                            struct mempool_backtrace_s, node)
         {
           if ((dump->pid == buf->pid || dump->pid == PID_MM_ALLOC ||
-               (dump->pid == PID_MM_LEAK && !!nxsched_get_tcb(buf->pid))) &&
+               (dump->pid == PID_MM_LEAK && !nxsched_get_tcb(buf->pid))) &&
               buf->seqno >= dump->seqmin && buf->seqno <= dump->seqmax)
             {
               char tmp[CONFIG_MM_BACKTRACE * MM_PTR_FMT_WIDTH + 1] = "";
diff --git a/mm/mm_heap/mm_mallinfo.c b/mm/mm_heap/mm_mallinfo.c
index a0f14535589..d844bd9293c 100644
--- a/mm/mm_heap/mm_mallinfo.c
+++ b/mm/mm_heap/mm_mallinfo.c
@@ -106,7 +106,8 @@ static void mallinfo_task_handler(FAR struct mm_allocnode_s *node,
 #else
       if ((task->pid == node->pid ||
            (task->pid == PID_MM_ALLOC && node->pid != PID_MM_MEMPOOL) ||
-           (task->pid == PID_MM_LEAK && !!nxsched_get_tcb(node->pid))) &&
+           (task->pid == PID_MM_LEAK && node->pid >= 0 &&
+            !nxsched_get_tcb(node->pid))) &&
           node->seqno >= task->seqmin && node->seqno <= task->seqmax)
         {
           info->aordblks++;
diff --git a/mm/mm_heap/mm_memdump.c b/mm/mm_heap/mm_memdump.c
index 57b831982b6..7f45c2f419f 100644
--- a/mm/mm_heap/mm_memdump.c
+++ b/mm/mm_heap/mm_memdump.c
@@ -61,9 +61,9 @@ static void memdump_handler(FAR struct mm_allocnode_s *node, FAR void *arg)
 #if CONFIG_MM_BACKTRACE < 0
       if (dump->pid == PID_MM_ALLOC)
 #else
-      if ((dump->pid == node->pid ||
-           (dump->pid == PID_MM_ALLOC && node->pid != PID_MM_MEMPOOL) ||
-           (dump->pid == PID_MM_LEAK && !!nxsched_get_tcb(node->pid))) &&
+      if ((dump->pid == node->pid || dump->pid == PID_MM_ALLOC ||
+           (dump->pid == PID_MM_LEAK && node->pid >= 0 &&
+            !nxsched_get_tcb(node->pid))) &&
           node->seqno >= dump->seqmin && node->seqno <= dump->seqmax)
 #endif
         {
diff --git a/mm/tlsf/mm_tlsf.c b/mm/tlsf/mm_tlsf.c
index 30de861a39c..70ae02af17f 100644
--- a/mm/tlsf/mm_tlsf.c
+++ b/mm/tlsf/mm_tlsf.c
@@ -299,7 +299,8 @@ static void mallinfo_task_handler(FAR void *ptr, size_t size, int used,
 
       if ((task->pid == buf->pid ||
            (task->pid == PID_MM_ALLOC && buf->pid != PID_MM_MEMPOOL) ||
-           (task->pid == PID_MM_LEAK && !!nxsched_get_tcb(buf->pid))) &&
+           (task->pid == PID_MM_LEAK && buf->pid >= 0 &&
+            !nxsched_get_tcb(buf->pid))) &&
           buf->seqno >= task->seqmin && buf->seqno <= task->seqmax)
         {
           info->aordblks++;
@@ -412,7 +413,8 @@ static void memdump_handler(FAR void *ptr, size_t size, int used,
 
       if ((dump->pid == buf->pid ||
            (dump->pid == PID_MM_ALLOC && buf->pid != PID_MM_MEMPOOL) ||
-           (dump->pid == PID_MM_LEAK && !!nxsched_get_tcb(buf->pid))) &&
+           (dump->pid == PID_MM_LEAK && buf->pid >= 0 &&
+            !nxsched_get_tcb(buf->pid))) &&
           buf->seqno >= dump->seqmin && buf->seqno <= dump->seqmax)
 #endif
         {