add kernel_sys.py to contrib

This script mimics crash>sys and provides the following output:

CPUS             16
DATE             Fri Jan 27 20:26:24 2023
UPTIME           1 day, 7:29:37
LOAD AVERAGE     0.00, 0.00, 0.00
TASKS            317
NODENAME         tw
RELEASE          6.1.7-1-default
VERSION          osandov#1 SMP PREEMPT_DYNAMIC Wed Jan 18 11:12:34 UTC 2023 (872045c)
MACHINE          x86_64
MEMORY           12.67 GiB

Signed-off-by: Martin Liska <[email protected]>

contrib/kernel_sys.py

@@ -0,0 +1,39 @@
+#!/usr/bin/env drgn
+# Copyright (c) SUSE Linux.
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+"""Display system information and configuration data."""
+
+from datetime import datetime
+from datetime import timedelta
+
+from drgn.helpers.common.format import number_in_binary_units
+from drgn.helpers.linux import for_each_online_cpu
+from drgn.helpers.linux.mm import totalram_pages
+from drgn.helpers.linux.pid import for_each_task
+from drgn.helpers.linux.sched import loadavg
+
+
+def print_line(key, value):
+    print(f"{key:<16} {value}")
+
+
+uts = prog["init_uts_ns"].name
+
+timekeeper = prog["shadow_timekeeper"]
+date = datetime.fromtimestamp(timekeeper.xtime_sec).strftime("%c")
+uptime = timedelta(seconds=timekeeper.ktime_sec.value_())
+load = ", ".join([f"{v:.2f}" for v in loadavg(prog)])
+totalram = (prog['PAGE_SIZE'] * totalram_pages(prog)).value_()
+
+
+print_line("CPUS", len(list(for_each_online_cpu(prog))))
+print_line("DATE", date)
+print_line("UPTIME", uptime)
+print_line("LOAD AVERAGE", load)
+print_line("TASKS", len(list(for_each_task(prog))))
+print_line("NODENAME", uts.nodename.string_().decode())
+print_line("RELEASE", uts.release.string_().decode())
+print_line("VERSION", uts.version.string_().decode())
+print_line("MACHINE", uts.machine.string_().decode())
+print_line("MEMORY", number_in_binary_units(totalram))