1 files changed, 122 insertions, 0 deletions
diff --git a/usr.bin/kstat/kstat.c b/usr.bin/kstat/kstat.c
new file mode 100644
index 0000000..cbbe602
--- /dev/null
+++ b/usr.bin/kstat/kstat.c
@@ -0,0 +1,122 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. Neither the name of Hyra 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 <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)
+{
+    struct sched_stat stat;
+    struct sched_cpu *cpu;
+    double nonline, noffline;
+    uint16_t online_percent;
+    int fd;
+
+    fd = open("/ctl/sched/stat", O_RDONLY);
+    if (fd < 0) {
+        printf("failed to get sched stat\n");
+        return;
+    }
+    if (read(fd, &stat, sizeof(stat)) < 0) {
+        printf("failed to read sched stat\n");
+        return;
+    }
+
+    close(fd);
+    noffline = stat.nhlt;
+    nonline = (stat.ncpu - noffline);
+    online_percent = (uint16_t)(((double)nonline / (nonline + noffline)) * 100);
+
+    printf("number of tasks: %d\n", stat.nproc);
+    printf("number of cores online: %d\n", stat.ncpu);
+    printf("scheduler quantum: %d usec\n", stat.quantum_usec);
+    printf("CPU is %d%% online\n", online_percent);
+
+    /*
+     * Log out some per-cpu information
+     */
+    for (int i = 0; i < stat.ncpu; ++i) {
+        cpu = &stat.cpus[i];
+        printf("[cpu %d]: %d switches\n", i, cpu->nswitch);
+    }
+}
+
+int
+main(void)
+{
+    printf("-- scheduler statistics --\n");
+    get_sched_stat();
+    printf("-- memory statistics --\n");
+    get_vm_stat();
+    return 0;
+}