Add an option to automatically discover the host's numa and cpu counts
and use those values for a non cross-build.
Give users the option to override the per-arch default values or values
from cross files by specifying them on the command line with -Dmax_lcores
and -Dmax_numa_nodes.

Signed-off-by: Juraj Linkeš <redacted>
Reviewed-by: Honnappa Nagarahalli <redacted>
---
  MAINTAINERS                  |  2 ++
  buildtools/get-cpu-count.py  |  7 ++++++
  buildtools/get-numa-count.py | 22 +++++++++++++++++
  buildtools/meson.build       |  2 ++
  config/meson.build           | 47 ++++++++++++++++++++++++++++++++++--
  config/x86/meson.build       |  2 ++
  meson_options.txt            |  8 +++---
  7 files changed, 84 insertions(+), 6 deletions(-)
  create mode 100644 buildtools/get-cpu-count.py
  create mode 100644 buildtools/get-numa-count.py

diff --git a/MAINTAINERS b/MAINTAINERS
index 0ec5588540..7270f33cf5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS

@@ -99,6 +99,8 @@ F: meson_options.txt
  F: config/
  F: buildtools/chkincs/
  F: buildtools/call-sphinx-build.py
+F: buildtools/get-cpu-count.py
+F: buildtools/get-numa-count.py
  F: buildtools/list-dir-globs.py
  F: buildtools/pkg-config/
  F: buildtools/symlink-drivers-solibs.sh

diff --git a/buildtools/get-cpu-count.py b/buildtools/get-cpu-count.py
new file mode 100644
index 0000000000..317b32088f
--- /dev/null
+++ b/buildtools/get-cpu-count.py

@@ -0,0 +1,7 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright (c) 2021 PANTHEON.tech s.r.o.
+
+import os
+
+print(os.cpu_count())

diff --git a/buildtools/get-numa-count.py b/buildtools/get-numa-count.py
new file mode 100644
index 0000000000..77ef2b9f24
--- /dev/null
+++ b/buildtools/get-numa-count.py

@@ -0,0 +1,22 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright (c) 2021 PANTHEON.tech s.r.o.
+
+import ctypes
+import glob
+import os
+import subprocess
+
+if os.name == 'posix':
+    if os.path.isdir('/sys/devices/system/node'):
+        print(len(glob.glob('/sys/devices/system/node/node*')))
+    else:
+        subprocess.run(['sysctl', '-n', 'vm.ndomains'])
+
+elif os.name == 'nt':
+    libkernel32 = ctypes.windll.kernel32
+
+    count = ctypes.c_ulong()
+
+    libkernel32.GetNumaHighestNodeNumber(ctypes.pointer(count))
+    print(count.value + 1)