From: David van Moolenbroek <david@minix3.org>
Date: Tue, 19 Jan 2010 21:00:20 +0000 (+0000)
Subject: VM information interface
X-Git-Tag: v3.1.6~68
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/zlib_tech.html?a=commitdiff_plain;h=61bb82a44b2a771c1f3c48cd11dc2cd60bf4d3fb;p=minix.git

VM information interface
---

diff --git a/etc/system.conf b/etc/system.conf
index d8d0c9a9f..276f832b4 100644
--- a/etc/system.conf
+++ b/etc/system.conf
@@ -200,7 +200,7 @@ service is
 		SYSCTL		# 44
 	;
 	vm
-		CTL
+		INFO
 	;
 	uid 0;
 };
diff --git a/include/minix/com.h b/include/minix/com.h
index 0386e6c24..443e50426 100644
--- a/include/minix/com.h
+++ b/include/minix/com.h
@@ -974,13 +974,17 @@
 #	define VM_NOTIFY_SIG_ENDPOINT	m1_i1
 #	define VM_NOTIFY_SIG_IPC	m1_i2
 
-#define VM_CTL			(VM_RQ_BASE+40)
-#define VCTL_WHAT			m1_i1
-#define VCTL_PARAM			m1_i2
-
-/* VCTL_PARAMs */
-#define VCTLP_STATS_MEM			1
-#define VCTLP_STATS_EP			2
+#define VM_INFO			(VM_RQ_BASE+40)
+#	define VMI_WHAT			m2_i1
+#	define VMI_EP			m2_i2
+#	define VMI_COUNT		m2_i3
+#	define VMI_PTR			m2_p1
+#	define VMI_NEXT			m2_l1
+
+/* VMI_WHAT values. */
+#define VMIW_STATS			1
+#define VMIW_USAGE			2
+#define VMIW_REGION			3
 
 /* Total. */
 #define NR_VM_CALLS				41
diff --git a/include/minix/vm.h b/include/minix/vm.h
index 496abc662..3755dfa96 100644
--- a/include/minix/vm.h
+++ b/include/minix/vm.h
@@ -27,5 +27,34 @@ _PROTOTYPE( int vm_ctl, (int what, int param));
 _PROTOTYPE( int vm_set_priv, (int procnr, void *buf));
 _PROTOTYPE( int vm_query_exit, (int *endpt));
 
+struct vm_stats_info {
+  int vsi_pagesize;		/* page size */
+  int vsi_total;		/* total number of memory pages */
+  int vsi_free;			/* number of free pages */
+  int vsi_largest;		/* largest number of consecutive free pages */
+};
+
+struct vm_usage_info {
+  vir_bytes vui_total;		/* total amount of process memory */
+  vir_bytes vui_common;		/* part of memory mapped in more than once */
+  vir_bytes vui_shared;		/* shared (non-COW) part of common memory */
+};
+
+struct vm_region_info {
+  int vri_seg;			/* segment of virtual region (T or D) */
+  vir_bytes vri_addr;		/* base address of region */
+  vir_bytes vri_length;		/* length of region */
+  int vri_prot;			/* protection flags (PROT_) */
+  int vri_flags;		/* memory flags (subset of MAP_) */
+};
+
+#define MAX_VRI_COUNT	64	/* max. number of regions provided at once */
+
+_PROTOTYPE( int vm_info_stats, (struct vm_stats_info *vfi)		);
+_PROTOTYPE( int vm_info_usage, (endpoint_t who,
+	struct vm_usage_info *vui)					);
+_PROTOTYPE( int vm_info_region, (endpoint_t who,
+	struct vm_region_info *vri, int count, vir_bytes *next)		);
+
 #endif /* _MINIX_VM_H */
 
diff --git a/lib/syslib/Makefile.in b/lib/syslib/Makefile.in
index 9549cc31b..34416a6ce 100644
--- a/lib/syslib/Makefile.in
+++ b/lib/syslib/Makefile.in
@@ -80,11 +80,11 @@ libsys_FILES=" \
 	taskcall.c \
 	ds.c	\
 	vm_brk.c \
-	vm_ctl.c \
 	vm_exec_newmem.c \
 	vm_exit.c \
 	vm_notify_sig.c \
 	vm_fork.c \
+	vm_info.c \
 	vm_map_phys.c \
 	vm_umap.c \
 	vm_push_sig.c"
diff --git a/lib/syslib/vm_ctl.c b/lib/syslib/vm_ctl.c
deleted file mode 100644
index 545d5cce5..000000000
--- a/lib/syslib/vm_ctl.c
+++ /dev/null
@@ -1,18 +0,0 @@
-
-#include "syslib.h"
-
-#include <minix/vm.h>
-
-/*===========================================================================*
- *                                vm_umap				     *
- *===========================================================================*/
-PUBLIC int vm_ctl(int what, int param)
-{
-    message m;
-    int result;
-
-    m.VCTL_WHAT = what;
-    m.VCTL_PARAM = param;
-    return _taskcall(VM_PROC_NR, VM_CTL, &m);
-}
-
diff --git a/lib/syslib/vm_info.c b/lib/syslib/vm_info.c
new file mode 100644
index 000000000..88fdc07d2
--- /dev/null
+++ b/lib/syslib/vm_info.c
@@ -0,0 +1,54 @@
+
+#include "syslib.h"
+
+#include <minix/vm.h>
+
+/*===========================================================================*
+ *                                vm_info_stats				     *
+ *===========================================================================*/
+PUBLIC int vm_info_stats(struct vm_stats_info *vsi)
+{
+    message m;
+
+    m.VMI_WHAT = VMIW_STATS;
+    m.VMI_PTR = (void *) vsi;
+
+    return _taskcall(VM_PROC_NR, VM_INFO, &m);
+}
+
+/*===========================================================================*
+ *                                vm_info_usage				     *
+ *===========================================================================*/
+PUBLIC int vm_info_usage(endpoint_t who, struct vm_usage_info *vui)
+{
+    message m;
+
+    m.VMI_WHAT = VMIW_USAGE;
+    m.VMI_EP = who;
+    m.VMI_PTR = (void *) vui;
+
+    return _taskcall(VM_PROC_NR, VM_INFO, &m);
+}
+
+/*===========================================================================*
+ *                                vm_info_region			     *
+ *===========================================================================*/
+PUBLIC int vm_info_region(endpoint_t who, struct vm_region_info *vri,
+	int count, vir_bytes *next)
+{
+    message m;
+    int result;
+
+    m.VMI_WHAT = VMIW_REGION;
+    m.VMI_EP = who;
+    m.VMI_COUNT = count;
+    m.VMI_PTR = (void *) vri;
+    m.VMI_NEXT = *next;
+
+    if ((result = _taskcall(VM_PROC_NR, VM_INFO, &m)) != OK)
+        return result;
+
+    *next = m.VMI_NEXT;
+    return m.VMI_COUNT;
+}
+
diff --git a/servers/is/Makefile b/servers/is/Makefile
index 5edfab3ff..59404167e 100644
--- a/servers/is/Makefile
+++ b/servers/is/Makefile
@@ -20,7 +20,7 @@ CFLAGS = $(CPROFILE) $(CPPFLAGS)
 LDFLAGS = -i
 LIBS = -lsys 
 
-OBJ = main.o dmp.o dmp_kernel.o dmp_pm.o dmp_fs.o dmp_rs.o dmp_ds.o 
+OBJ = main.o dmp.o dmp_kernel.o dmp_pm.o dmp_fs.o dmp_rs.o dmp_ds.o dmp_vm.o
 
 # build local binary
 all build:	$(SERVER)
diff --git a/servers/is/dmp.c b/servers/is/dmp.c
index 75618a0f3..f5d9c782b 100644
--- a/servers/is/dmp.c
+++ b/servers/is/dmp.c
@@ -23,7 +23,7 @@ struct hook_entry {
 	{ F5,	monparams_dmp, "Boot monitor parameters" },
 	{ F6,	irqtab_dmp, "IRQ hooks and policies" },
 	{ F7,	kmessages_dmp, "Kernel messages" },
-	{ F8,	vm_dmp, "VM status" },
+	{ F8,	vm_dmp, "VM status and process maps" },
 	{ F10,	kenv_dmp, "Kernel parameters" },
 	{ F11,	timing_dmp, "Timing details (if enabled)" },
 	{ SF1,	mproc_dmp, "Process manager process table" },
@@ -126,12 +126,3 @@ PUBLIC void mapping_dmp(void)
       printf(" %10s.  %s\n", key_name(hooks[h].key), hooks[h].name);
   printf("\n");
 }
-
-/*===========================================================================*
- *				vm_dmp				     *
- *===========================================================================*/
-PUBLIC void vm_dmp(void)
-{
-	vm_ctl(VCTLP_STATS_MEM, 0);
-
-}
diff --git a/servers/is/dmp_ds.c b/servers/is/dmp_ds.c
index 5e9086cd1..8d6769078 100644
--- a/servers/is/dmp_ds.c
+++ b/servers/is/dmp_ds.c
@@ -1,6 +1,8 @@
 #include "inc.h"
 #include "../ds/store.h"
 
+#define LINES 22
+
 PRIVATE struct data_store ds_store[NR_DS_KEYS];
 
 PUBLIC void data_store_dmp()
@@ -16,7 +18,7 @@ PUBLIC void data_store_dmp()
 
   printf("Data store contents:\n");
   printf("-slot- ------key------ -----owner----- ---type--- ----value---\n");
-  for(i = prev_i; i < NR_DS_KEYS; i++) {
+  for(i = prev_i; i < NR_DS_KEYS && n < LINES; i++) {
 	p = &ds_store[i];
 	if(!(p->flags & DSF_IN_USE))
 		continue;
@@ -43,8 +45,7 @@ PUBLIC void data_store_dmp()
 		return;
 	}
 
-	if(n++ == 21)
-		break;
+	n++;
   }
 
   if (i >= NR_DS_KEYS) i = 0;
diff --git a/servers/is/dmp_vm.c b/servers/is/dmp_vm.c
new file mode 100644
index 000000000..3201a1fdd
--- /dev/null
+++ b/servers/is/dmp_vm.c
@@ -0,0 +1,119 @@
+/* Debugging dump procedures for the VM server. */
+
+#include "inc.h"
+#include <sys/mman.h>
+#include <minix/vm.h>
+#include <timers.h>
+#include "../../kernel/proc.h"
+
+#define LINES 24
+
+PRIVATE void print_region(struct vm_region_info *vri)
+{
+  char c;
+
+  switch (vri->vri_seg) {
+  case T: c = 'T'; break;
+  case D: c = 'D'; break;
+  default: c = '?';
+  }
+
+  printf("  %c %08lx-%08lx %c%c%c %c (%lu kB)\n", c, vri->vri_addr,
+	vri->vri_addr + vri->vri_length,
+	(vri->vri_prot & PROT_READ) ? 'r' : '-',
+	(vri->vri_prot & PROT_WRITE) ? 'w' : '-',
+	(vri->vri_prot & PROT_EXEC) ? 'x' : '-',
+	(vri->vri_flags & MAP_SHARED) ? 's' : 'p',
+	vri->vri_length / 1024L);
+}
+
+PUBLIC void vm_dmp()
+{
+  static struct proc proc[NR_TASKS + NR_PROCS];
+  static struct vm_region_info vri[LINES];
+  struct vm_stats_info vsi;
+  struct vm_usage_info vui;
+  static int prev_i = -1;
+  static vir_bytes prev_base = 0;
+  int r, r2, i, j, first, n = 0;
+
+  if (prev_i == -1) {
+	if ((r = vm_info_stats(&vsi)) != OK) {
+		report("IS", "warning: couldn't talk to VM", r);
+		return;
+	}
+
+	printf("Total %u kB, free %u kB, largest free area %u kB\n",	
+		vsi.vsi_total * (vsi.vsi_pagesize / 1024),
+		vsi.vsi_free * (vsi.vsi_pagesize / 1024),
+		vsi.vsi_largest * (vsi.vsi_pagesize / 1024));
+	n++;
+	printf("\n");
+	n++;
+
+  	prev_i++;
+  }
+
+  if ((r = sys_getproctab(proc)) != OK) {
+	report("IS", "warning: couldn't get copy of process table", r);
+	return;
+  }
+
+  for (i = prev_i; i < NR_TASKS + NR_PROCS && n < LINES; i++, prev_base = 0) {
+	if (i < NR_TASKS || isemptyp(&proc[i])) continue;
+
+	/* The first batch dump for each process contains a header line. */
+	first = prev_base == 0;
+
+	r = vm_info_region(proc[i].p_endpoint, vri, LINES - first, &prev_base);
+
+	if (r < 0) {
+		printf("Process %d (%s): error %d\n",
+			proc[i].p_endpoint, proc[i].p_name, r);
+		n++;
+		continue;
+	}
+
+	if (first) {
+		/* The entire batch should fit on the screen. */
+		if (n + 1 + r > LINES) {
+			prev_base = 0;	/* restart on next page */
+			break;
+		}
+
+		if ((r2 = vm_info_usage(proc[i].p_endpoint, &vui)) != OK) {
+			printf("Process %d (%s): error %d\n",
+				proc[i].p_endpoint, proc[i].p_name, r2);
+			n++;
+			continue;
+		}
+
+		printf("Process %d (%s): total %lu kB, common %lu kB, "
+			"shared %lu kB\n",
+			proc[i].p_endpoint, proc[i].p_name,
+			vui.vui_total / 1024L, vui.vui_common / 1024L,
+			vui.vui_shared / 1024L);
+		n++;
+	}
+
+	for (j = 0; j < r; j++) {
+		print_region(&vri[j]);
+		n++;
+	}
+
+	if (n > LINES) printf("IS: internal error\n");
+	if (n == LINES) break;
+
+	/* This may have to wipe out the "--more--" from below. */
+	printf("        \n");
+	n++;
+  }
+
+  if (i >= NR_TASKS + NR_PROCS) {
+	i = -1;
+	prev_base = 0;
+  }
+  else printf("--more--\r");
+  prev_i = i;
+}
+
diff --git a/servers/rs/service.c b/servers/rs/service.c
index d6d26dc98..695ece7b4 100644
--- a/servers/rs/service.c
+++ b/servers/rs/service.c
@@ -803,7 +803,7 @@ struct
 	{ "GETPHYS",		VM_GETPHYS },
 	{ "GETREFCNT",		VM_GETREF },
 	{ "QUERYEXIT",		VM_QUERY_EXIT },
-	{ "CTL",		VM_CTL },
+	{ "INFO",		VM_INFO },
 	{ NULL,			0 },
 };
 
diff --git a/servers/vm/alloc.c b/servers/vm/alloc.c
index 0af48ed8a..5ce525927 100644
--- a/servers/vm/alloc.c
+++ b/servers/vm/alloc.c
@@ -405,6 +405,8 @@ struct memory *chunks;		/* list of free memory chunks */
 
   addr_init(&addravl);
 
+  total_pages = 0;
+
   /* Use the chunks of physical memory to allocate holes. */
   for (i=NR_MEMS-1; i>=0; i--) {
   	if (chunks[i].size > 0) {
@@ -413,6 +415,7 @@ struct memory *chunks;		/* list of free memory chunks */
 		if(first || from < mem_low) mem_low = from;
 		if(first || to > mem_high) mem_high = to;
 		FREE_MEM(chunks[i].base, chunks[i].size);
+		total_pages += chunks[i].size;
 		first = 0;
 	}
   }
diff --git a/servers/vm/glo.h b/servers/vm/glo.h
index 0889a8f06..49f82ec82 100644
--- a/servers/vm/glo.h
+++ b/servers/vm/glo.h
@@ -24,6 +24,9 @@ EXTERN int incheck;
 EXTERN long vm_sanitychecklevel;
 #endif
 
+/* total number of memory pages */
+EXTERN int total_pages;
+
 /* vm operation mode state and values */
 EXTERN long vm_paged;
 
diff --git a/servers/vm/i386/vm.c b/servers/vm/i386/vm.c
index 0f4be46ea..f23534e7a 100644
--- a/servers/vm/i386/vm.c
+++ b/servers/vm/i386/vm.c
@@ -61,6 +61,36 @@ PUBLIC char *arch_map2str(struct vmproc *vmp, vir_bytes addr)
 	return bufstr;
 }
 
+/*===========================================================================*
+ *				arch_map2info				     *
+ *===========================================================================*/
+PUBLIC vir_bytes arch_map2info(struct vmproc *vmp, vir_bytes addr, int *seg,
+	int *prot)
+{
+	vir_bytes textstart = CLICK2ABS(vmp->vm_arch.vm_seg[T].mem_phys);
+	vir_bytes textend = textstart +
+		CLICK2ABS(vmp->vm_arch.vm_seg[T].mem_len);
+	vir_bytes datastart = CLICK2ABS(vmp->vm_arch.vm_seg[D].mem_phys);
+
+	/* The protection to be returned here is that of the segment. */
+	if(addr < textstart) {
+		*seg = D;
+		*prot = PROT_READ | PROT_WRITE | PROT_EXEC;
+		return addr;
+	} else if(addr < datastart) {
+		*seg = T;
+		*prot = PROT_READ | PROT_EXEC;
+		return addr - textstart;
+	} else {
+		*seg = D;
+		if (textstart == textend)	/* common I&D? */
+			*prot = PROT_READ | PROT_WRITE | PROT_EXEC;
+		else
+			*prot = PROT_READ | PROT_WRITE;
+		return addr - datastart;
+	}
+}
+
 /*===========================================================================*
  *				arch_addrok				     *
  *===========================================================================*/
diff --git a/servers/vm/main.c b/servers/vm/main.c
index fcf097666..c734f6c0e 100644
--- a/servers/vm/main.c
+++ b/servers/vm/main.c
@@ -347,7 +347,7 @@ PRIVATE int sef_cb_init_fresh(int type, sef_init_info_t *info)
 	CALLMAP(VM_GETPHYS, do_get_phys);
 	CALLMAP(VM_SHM_UNMAP, do_shared_unmap);
 	CALLMAP(VM_GETREF, do_get_refcount);
-	CALLMAP(VM_CTL, do_ctl);
+	CALLMAP(VM_INFO, do_info);
 	CALLMAP(VM_QUERY_EXIT, do_query_exit);
 
 	/* Sanity checks */
diff --git a/servers/vm/proto.h b/servers/vm/proto.h
index daf6ac983..d7d296d84 100644
--- a/servers/vm/proto.h
+++ b/servers/vm/proto.h
@@ -10,6 +10,7 @@ struct phys_region;
 #include <minix/ipc.h>
 #include <minix/endpoint.h>
 #include <minix/safecopies.h>
+#include <minix/vm.h>
 #include <timers.h>
 #include <stdio.h>
 #include <pagetable.h>
@@ -42,7 +43,7 @@ _PROTOTYPE( void reserve_proc_mem, (struct memory *mem_chunks,
         struct mem_map *map_ptr));
 _PROTOTYPE( int vm_isokendpt, (endpoint_t ep, int *proc)	     );
 _PROTOTYPE( int get_stack_ptr, (int proc_nr, vir_bytes *sp)             );
-_PROTOTYPE( int do_ctl, (message *)             );
+_PROTOTYPE( int do_info, (message *)					);
 
 /* exit.c */
 _PROTOTYPE( void clear_proc, (struct vmproc *vmp)			);
@@ -168,16 +169,22 @@ _PROTOTYPE(int map_copy_ph_block, (struct vmproc *vmp,
 	struct vir_region *region, struct phys_region *ph));
 _PROTOTYPE(void pb_unreferenced, (struct vir_region *region,
 	struct phys_region *pr));
+_PROTOTYPE(void get_usage_info, (struct vmproc *vmp,
+	struct vm_usage_info *vui));
+_PROTOTYPE(int get_region_info, (struct vmproc *vmp,
+	struct vm_region_info *vri, int count, vir_bytes *nextp));
 #if SANITYCHECKS
 _PROTOTYPE(void map_sanitycheck,(char *file, int line));
 #endif
 
 /* $(ARCH)/vm.c */
-_PROTOTYPE( vir_bytes, arch_map2vir(struct vmproc *vmp, vir_bytes addr));
-_PROTOTYPE( char *, arch_map2str(struct vmproc *vmp, vir_bytes addr));
-_PROTOTYPE( vir_bytes, arch_vir2map(struct vmproc *vmp, vir_bytes addr));
-_PROTOTYPE( vir_bytes, arch_vir2map_text(struct vmproc *vmp, vir_bytes addr));
-_PROTOTYPE( vir_bytes, arch_addrok(struct vmproc *vmp, vir_bytes addr));
+_PROTOTYPE( vir_bytes arch_map2vir, (struct vmproc *vmp, vir_bytes addr));
+_PROTOTYPE( char *arch_map2str, (struct vmproc *vmp, vir_bytes addr));
+_PROTOTYPE( vir_bytes arch_map2info, (struct vmproc *vmp, vir_bytes addr,
+	int *space, int *prot));
+_PROTOTYPE( vir_bytes arch_vir2map, (struct vmproc *vmp, vir_bytes addr));
+_PROTOTYPE( vir_bytes arch_vir2map_text, (struct vmproc *vmp, vir_bytes addr));
+_PROTOTYPE( vir_bytes arch_addrok, (struct vmproc *vmp, vir_bytes addr));
 
 /* rs.c */
 _PROTOTYPE(int do_rs_set_priv, (message *m));
diff --git a/servers/vm/region.c b/servers/vm/region.c
index 33768ada7..616c5c51e 100644
--- a/servers/vm/region.c
+++ b/servers/vm/region.c
@@ -1455,6 +1455,76 @@ PUBLIC int map_get_ref(struct vmproc *vmp, vir_bytes addr, u8_t *cnt)
 	return OK;
 }
 
+/*========================================================================*
+ *				get_usage_info				  *
+ *========================================================================*/
+PUBLIC void get_usage_info(struct vmproc *vmp, struct vm_usage_info *vui)
+{
+	struct vir_region *vr;
+	physr_iter iter;
+	struct phys_region *ph;
+	vir_bytes len;
+
+	memset(vui, 0, sizeof(*vui));
+
+	for(vr = vmp->vm_regions; vr; vr = vr->next) {
+		physr_start_iter_least(vr->phys, &iter);
+		while((ph = physr_get_iter(&iter))) {
+			len = ph->ph->length;
+
+			/* All present pages are counted towards the total. */
+			vui->vui_total += len;
+
+			if (ph->ph->refcount > 1) {
+				/* Any page with a refcount > 1 is common. */
+				vui->vui_common += len;
+	
+				/* Any common, non-COW page is shared. */
+				if (vr->flags & VR_SHARED ||
+					ph->ph->share_flag == PBSH_SMAP)
+					vui->vui_shared += len;
+			}
+			physr_incr_iter(&iter);
+		}
+	}
+}
+
+/*===========================================================================*
+ *				get_region_info				     *
+ *===========================================================================*/
+PUBLIC int get_region_info(struct vmproc *vmp, struct vm_region_info *vri,
+	int max, vir_bytes *nextp)
+{
+	struct vir_region *vr;
+	vir_bytes next;
+	int count;
+
+	next = *nextp;
+
+	if (!max) return 0;
+
+	for(vr = vmp->vm_regions; vr; vr = vr->next)
+		if (vr->vaddr >= next) break;
+
+	if (!vr) return 0;
+
+	for(count = 0; vr && count < max; vr = vr->next, count++, vri++) {
+		vri->vri_addr = arch_map2info(vmp, vr->vaddr, &vri->vri_seg,
+			&vri->vri_prot);
+		vri->vri_length = vr->length;
+
+		/* "AND" the provided protection with per-page protection. */
+		if (!(vr->flags & VR_WRITABLE))
+			vri->vri_prot &= ~PROT_WRITE;
+
+		vri->vri_flags = (vr->flags & VR_SHARED) ? MAP_SHARED : 0;
+
+		next = vr->vaddr + vr->length;
+	}
+
+	*nextp = next;
+	return count;
+}
 
 /*========================================================================*
  *				regionprintstats			  *
diff --git a/servers/vm/utility.c b/servers/vm/utility.c
index a9d4182b6..bebf9fb51 100644
--- a/servers/vm/utility.c
+++ b/servers/vm/utility.c
@@ -122,7 +122,7 @@ PUBLIC int vm_isokendpt(endpoint_t endpoint, int *proc)
 {
         *proc = _ENDPOINT_P(endpoint);
         if(*proc < 0 || *proc >= NR_PROCS)
-        	vm_panic("crazy slot number", *proc); 
+		return EINVAL;
         if(*proc >= 0 && endpoint != vmproc[*proc].vm_endpoint)
                 return EDEADSRCDST;
         if(*proc >= 0 && !(vmproc[*proc].vm_flags & VMF_INUSE))
@@ -166,27 +166,82 @@ char *brk_addr;
 }
 
 /*===========================================================================*
- *                              do_ctl                                        *
+ *                              do_info                                      *
  *===========================================================================*/
-PUBLIC int do_ctl(message *m)
+PUBLIC int do_info(message *m)
 {
-	int pages, nodes;
-	int pr;
+	struct vm_stats_info vsi;
+	struct vm_usage_info vui;
+	static struct vm_region_info vri[MAX_VRI_COUNT];
 	struct vmproc *vmp;
+	vir_bytes addr, size, next, ptr;
+	int r, pr, dummy, count;
 
-	switch(m->VCTL_WHAT) {
-		case VCTLP_STATS_MEM:
-			printmemstats();
-			break;
-		case VCTLP_STATS_EP:
-			if(vm_isokendpt(m->VCTL_PARAM, &pr) != OK)
-				return EINVAL;
-			printregionstats(&vmproc[pr]);
-			break;
-		default:
+	if (vm_isokendpt(m->m_source, &pr) != OK)
+		return EINVAL;
+	vmp = &vmproc[pr];
+
+	ptr = (vir_bytes) m->VMI_PTR;
+
+	switch(m->VMI_WHAT) {
+	case VMIW_STATS:
+		vsi.vsi_pagesize = VM_PAGE_SIZE;
+		vsi.vsi_total = total_pages;
+		memstats(&dummy, &vsi.vsi_free, &vsi.vsi_largest);
+
+		addr = (vir_bytes) &vsi;
+		size = sizeof(vsi);
+
+		break;
+
+	case VMIW_USAGE:
+		if (vm_isokendpt(m->VMI_EP, &pr) != OK)
+			return EINVAL;
+
+		get_usage_info(&vmproc[pr], &vui);
+
+		addr = (vir_bytes) &vui;
+		size = sizeof(vui);
+
+		break;
+
+	case VMIW_REGION:
+		if (vm_isokendpt(m->VMI_EP, &pr) != OK)
 			return EINVAL;
+
+		count = MIN(m->VMI_COUNT, MAX_VRI_COUNT);
+		next = m->VMI_NEXT;
+
+		count = get_region_info(&vmproc[pr], vri, count, &next);
+
+		m->VMI_COUNT = count;
+		m->VMI_NEXT = next;
+
+		addr = (vir_bytes) vri;
+		size = sizeof(vri[0]) * count;
+
+		break;
+
+	default:
+		return EINVAL;
 	}
 
-	return OK;
+	if (size == 0)
+		return OK;
+
+	/* Make sure that no page faults can occur while copying out. A page
+	 * fault would cause the kernel to send a notify to us, while we would
+	 * be waiting for the result of the copy system call, resulting in a
+	 * deadlock. Note that no memory mapping can be undone without the
+	 * involvement of VM, so we are safe until we're done.
+	 */
+	r = handle_memory(vmp, arch_vir2map(vmp, ptr), size, 1 /*wrflag*/);
+	if (r != OK) return r;
+
+	/* Now that we know the copy out will succeed, perform the actual copy
+	 * operation.
+	 */
+	return sys_datacopy(SELF, addr,
+		(vir_bytes) vmp->vm_endpoint, ptr, size);
 }