Index: kernel/generic/include/mm/frame.h
===================================================================
--- kernel/generic/include/mm/frame.h	(revision 1ba37faf61b6713df5140f30fa781f7f2147c5ab)
+++ kernel/generic/include/mm/frame.h	(revision 516adcede91f3e4a1e790d6a39694d4b25772eb9)
@@ -170,4 +170,5 @@
 extern void zone_merge_all(void);
 extern uint64_t zone_total_size(void);
+extern void zone_busy_and_free(uint64_t *out_busy, uint64_t *out_free);
 
 /*
Index: kernel/generic/include/ps/meminfo.h
===================================================================
--- kernel/generic/include/ps/meminfo.h	(revision 516adcede91f3e4a1e790d6a39694d4b25772eb9)
+++ kernel/generic/include/ps/meminfo.h	(revision 516adcede91f3e4a1e790d6a39694d4b25772eb9)
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2010 Stanislav Kozina
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup generic
+ * @{
+ */
+/** @file
+ */
+
+#ifndef KERN_PS_MEM_H_
+#define KERN_PS_MEM_H_
+
+typedef struct {
+	uint64_t total;
+	uint64_t used;
+	uint64_t free;
+} uspace_mem_info_t;
+
+#endif
+
+/** @}
+ */
Index: kernel/generic/include/ps/ps.h
===================================================================
--- kernel/generic/include/ps/ps.h	(revision 1ba37faf61b6713df5140f30fa781f7f2147c5ab)
+++ kernel/generic/include/ps/ps.h	(revision 516adcede91f3e4a1e790d6a39694d4b25772eb9)
@@ -38,4 +38,5 @@
 #include <ps/taskinfo.h>
 #include <ps/cpuinfo.h>
+#include <ps/meminfo.h>
 
 extern size_t sys_ps_get_tasks(task_id_t *uspace_ids, size_t size);
@@ -43,4 +44,5 @@
 extern int sys_ps_get_threads(task_id_t *uspace_id, thread_info_t *uspace_infos, size_t size);
 extern int sys_ps_get_cpu_info(uspace_cpu_info_t *uspace_cpu);
+extern int sys_ps_get_mem_info(uspace_mem_info_t *mem_info);
 
 #endif
Index: kernel/generic/include/syscall/syscall.h
===================================================================
--- kernel/generic/include/syscall/syscall.h	(revision 1ba37faf61b6713df5140f30fa781f7f2147c5ab)
+++ kernel/generic/include/syscall/syscall.h	(revision 516adcede91f3e4a1e790d6a39694d4b25772eb9)
@@ -89,4 +89,5 @@
 
 	SYS_PS_GET_CPU_INFO,
+	SYS_PS_GET_MEM_INFO,
 	SYS_PS_GET_TASKS,
 	SYS_PS_GET_TASK_INFO,