Initial commit

[ta/infra-ansible.git] / roles / allocate_cpu_cores / library / get_cpu_topology.py

diff --git a/roles/allocate_cpu_cores/library/get_cpu_topology.py b/roles/allocate_cpu_cores/library/get_cpu_topology.py
new file mode 100644 (file)
index 0000000..bfec347
--- /dev/null
+++ b/roles/allocate_cpu_cores/library/get_cpu_topology.py
@@ -0,0 +1,63 @@
+#!/usr/bin/python
+
+# Copyright 2019 Nokia
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import glob
+
+from ansible.module_utils.basic import *
+
+def mask2list(path):
+    r = set()
+
+    with open(path, 'r') as f:
+        masks = [int(x, 16) for x in f.read().split(',')]
+
+    masks.reverse()
+
+    i = 0
+    for m in masks:
+        for j in range(32):
+            if m & (1 << j):
+                r.add(i)
+            i += 1
+
+    return sorted(r)
+
+def get_node_cores(nodepath):
+    r = []
+    s = set()
+
+    for cpu in mask2list(nodepath + '/cpumap'):
+        if cpu not in s:
+            v = mask2list(nodepath + '/cpu%d/topology/thread_siblings' % cpu)
+            r.append(v)
+            s.update(v)
+
+    return r
+
+def main():
+    module = AnsibleModule(argument_spec = { 'var': { 'required': True, 'type': 'str' } })
+
+    pattern = '/sys/devices/system/node/node*'
+    r = {}
+
+    for nodepath in glob.glob(pattern):
+        nodeid = nodepath[len(pattern) - 1:]
+        r['numa' + nodeid] = get_node_cores(nodepath)
+
+    module.exit_json(changed = False, ansible_facts = { module.params['var']: r })
+
+if __name__ == '__main__':
+    main()