diff --git a/toolbox/vmstat.c b/toolbox/vmstat.c
new file mode 100644
index 0000000..600f136
--- /dev/null
+++ b/toolbox/vmstat.c
@@ -0,0 +1,247 @@
+/*
+ * Copyright (c) 2008, The Android Open Source Project
+ * 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.
+ *  * Neither the name of Google, Inc. nor the names of its contributors
+ *    may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "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
+ * COPYRIGHT OWNER OR CONTRIBUTORS 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.
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/param.h>
+#include <unistd.h>
+
+struct state {
+    long procs_r;
+    long procs_b;
+
+    long mem_free;
+    long mem_mapped;
+    long mem_anon;
+    long mem_slab;
+
+    long sys_in;
+    long sys_cs;
+    long sys_flt;
+
+    long cpu_us;
+    long cpu_ni;
+    long cpu_sy;
+    long cpu_id;
+    long cpu_wa;
+    long cpu_ir;
+    long cpu_si;
+};
+
+#define MAX_LINE 256
+
+char line[MAX_LINE];
+
+static void read_state(struct state *s);
+static int read_meminfo(struct state *s);
+static int read_stat(struct state *s);
+static int read_vmstat(struct state *s);
+static void print_header(void);
+static void print_line(struct state *old, struct state *new);
+static void usage(char *cmd);
+
+int vmstat_main(int argc, char *argv[]) {
+    struct state s[2];
+    int iterations, delay, header_interval;
+    int toggle, count;
+    int i;
+
+    iterations = 0;
+    delay = 1;
+    header_interval = 20;
+
+    for (i = 1; i < argc; i++) {
+        if (!strcmp(argv[i], "-n")) { 
+            if (i >= argc - 1) {
+                fprintf(stderr, "Option -n requires an argument.\n");
+                exit(EXIT_FAILURE);
+            }
+            iterations = atoi(argv[++i]);
+            continue;
+        }
+        if (!strcmp(argv[i], "-d")) {
+            if (i >= argc - 1) {
+                fprintf(stderr, "Option -d requires an argument.\n");
+                exit(EXIT_FAILURE);
+            }
+            delay = atoi(argv[++i]);
+            continue;
+        }
+        if (!strcmp(argv[i], "-r")) {
+            if (i >= argc - 1) {
+                fprintf(stderr, "Option -r requires an argument.\n");
+                exit(EXIT_FAILURE);
+            }
+            header_interval = atoi(argv[++i]);
+            continue;
+        }
+        if (!strcmp(argv[i], "-h")) {
+            usage(argv[0]);
+            exit(EXIT_SUCCESS);
+        }
+        fprintf(stderr, "Invalid argument \"%s\".\n", argv[i]);
+        usage(argv[0]);
+	exit(EXIT_FAILURE);
+    }
+
+    toggle = 0;
+    count = 0;
+
+    if (!header_interval)
+        print_header();
+    read_state(&s[1 - toggle]);
+    while ((iterations == 0) || (iterations-- > 0)) {
+        sleep(delay);
+        read_state(&s[toggle]);
+        if (header_interval) {
+            if (count == 0)
+                print_header();
+            count = (count + 1) % header_interval;
+        }
+        print_line(&s[1 - toggle], &s[toggle]);
+        toggle = 1 - toggle;
+    }
+
+    return 0;
+}
+
+static void read_state(struct state *s) {
+    int error;
+
+    error = read_meminfo(s);
+    if (error) {
+        fprintf(stderr, "vmstat: could not read /proc/meminfo: %s\n", strerror(error));
+        exit(EXIT_FAILURE);
+    }
+
+    error = read_stat(s);
+    if (error) {
+        fprintf(stderr, "vmstat: could not read /proc/stat: %s\n", strerror(error));
+        exit(EXIT_FAILURE);
+    }
+
+    error = read_vmstat(s);
+    if (error) {
+        fprintf(stderr, "vmstat: could not read /proc/vmstat: %s\n", strerror(error));
+        exit(EXIT_FAILURE);
+    }
+}
+
+static int read_meminfo(struct state *s) {
+    FILE *f;
+
+    f = fopen("/proc/meminfo", "r");
+    if (!f) return errno;
+
+    while (fgets(line, MAX_LINE, f)) {
+        sscanf(line, "MemFree: %ld kB", &s->mem_free);
+        sscanf(line, "AnonPages: %ld kB", &s->mem_anon);
+        sscanf(line, "Mapped: %ld kB", &s->mem_mapped);
+        sscanf(line, "Slab: %ld kB", &s->mem_slab);
+    }
+
+    fclose(f);
+
+    return 0;
+}
+
+static int read_stat(struct state *s) {
+    FILE *f;
+
+    f = fopen("/proc/stat", "r");
+    if (!f) return errno;
+
+    while (fgets(line, MAX_LINE, f)) {
+        if (!strncmp(line, "cpu ", 4)) {
+            sscanf(line, "cpu  %ld %ld %ld %ld %ld %ld %ld",
+                &s->cpu_us, &s->cpu_ni, &s->cpu_sy, &s->cpu_id, &s->cpu_wa,
+                &s->cpu_ir, &s->cpu_si);
+        }
+        sscanf(line, "intr %ld", &s->sys_in);
+        sscanf(line, "ctxt %ld", &s->sys_cs);
+        sscanf(line, "procs_running %ld", &s->procs_r);
+        sscanf(line, "procs_blocked %ld", &s->procs_b);
+    }
+
+    fclose(f);
+
+    return 0;
+}
+
+static int read_vmstat(struct state *s) {
+    FILE *f;
+
+    f = fopen("/proc/vmstat", "r");
+    if (!f) return errno;
+
+    while (fgets(line, MAX_LINE, f)) {
+        sscanf(line, "pgmajfault %ld", &s->sys_flt);
+    }
+
+    fclose(f);
+
+    return 0;
+}
+
+static void print_header(void) {
+    printf("%-5s  %-27s  %-14s  %-17s\n", "procs", "memory", "system", "cpu");
+    printf("%2s %2s  %6s %6s %6s %6s  %4s %4s %4s  %2s %2s %2s %2s %2s %2s\n", "r", "b", "free", "mapped", "anon", "slab", "in", "cs", "flt", "us", "ni", "sy", "id", "wa", "ir");
+}
+
+/* Jiffies to percent conversion */
+#define JP(jif) ((jif) * 100 / (HZ))
+#define NORM(var) ((var) = (((var) > 99) ? (99) : (var)))
+
+static void print_line(struct state *old, struct state *new) {
+    int us, ni, sy, id, wa, ir;
+    us = JP(new->cpu_us - old->cpu_us); NORM(us);
+    ni = JP(new->cpu_ni - old->cpu_ni); NORM(ni);
+    sy = JP(new->cpu_sy - old->cpu_sy); NORM(sy);
+    id = JP(new->cpu_id - old->cpu_id); NORM(id);
+    wa = JP(new->cpu_wa - old->cpu_wa); NORM(wa);
+    ir = JP(new->cpu_ir - old->cpu_ir); NORM(ir);
+    printf("%2ld %2ld  %6ld %6ld %6ld %6ld  %4ld %4ld %4ld  %2d %2d %2d %2d %2d %2d\n",
+        new->procs_r ? (new->procs_r - 1) : 0, new->procs_b,
+        new->mem_free, new->mem_mapped, new->mem_anon, new->mem_slab,
+        new->sys_in - old->sys_in, new->sys_cs - old->sys_cs, new->sys_flt - old->sys_flt,
+        us, ni, sy, id, wa, ir);
+}
+
+static void usage(char *cmd) {
+    fprintf(stderr, "Usage: %s [ -h ] [ -n iterations ] [ -d delay ] [ -r header_repeat ]\n"
+                    "    -n iterations     How many rows of data to print.\n"
+                    "    -d delay          How long to sleep between rows.\n"
+                    "    -r header_repeat  How many rows to print before repeating\n"
+                    "                      the header.  Zero means never repeat.\n"
+                    "    -h                Displays this help screen.\n",
+        cmd);
+}