1 files changed, 42 insertions, 0 deletions
diff --git a/usr.bin/kstat/kstat.c b/usr.bin/kstat/kstat.c
index e3b7e6a..f062015 100644
--- a/usr.bin/kstat/kstat.c
+++ b/usr.bin/kstat/kstat.c
@@ -28,10 +28,51 @@
  */
 
 #include <sys/sched.h>
+#include <sys/vmstat.h>
 #include <stdio.h>
 #include <unistd.h>
 #include <fcntl.h>
 
+#define MIB_PER_GIB 1024
+
+static void
+print_size_mib(const char *name, size_t mib)
+{
+    if (name == NULL) {
+        return;
+    }
+
+    if (mib >= MIB_PER_GIB) {
+        printf("%s: %d GiB\n", name, mib / MIB_PER_GIB);
+    } else {
+        printf("%s: %d MiB\n", name, mib);
+    }
+}
+
+static void
+get_vm_stat(void)
+{
+    struct vm_stat vmstat;
+    int retval, fd;
+
+    fd = open("/ctl/vm/stat", O_RDONLY);
+    if (fd < 0) {
+        printf("failed to open '/ctl/vm/stat'\n");
+        return;
+    }
+
+    retval = read(fd, &vmstat, sizeof(vmstat));
+    if (retval <= 0) {
+        printf("failed to read vmstat\n");
+        return;
+    }
+
+    close(fd);
+    print_size_mib("memory available", vmstat.mem_avail);
+    print_size_mib("memory used", vmstat.mem_used);
+    print_size_mib("memory total", vmstat.mem_total);
+}
+
 static void
 get_sched_stat(void)
 {
@@ -76,5 +117,6 @@ int
 main(void)
 {
     get_sched_stat();
+    get_vm_stat();
     return 0;
 }