Analyze contiguous physical memory chunks that mmap system call gives

physmem_alloc_analysis/physmem_alloc_analyzer.py

Index: physmem_alloc_analysis/physmem_alloc_analyzer.py
diff --git a/physmem_alloc_analysis/physmem_alloc_analyzer.py b/physmem_alloc_analysis/physmem_alloc_analyzer.py
new file mode 100644
index 0000000000000000000000000000000000000000..3e3bd2135bd5a72b1c50322b1ffa1ba381da2f10
--- /dev/null
+++ b/physmem_alloc_analysis/physmem_alloc_analyzer.py
@@ -0,0 +1,47 @@
+# Copyright 2015, Google, Inc.
+#
+# 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.
+
+
+def GetResultPfns(log_filename):
+  for line in open(log_filename):
+    parts = line.strip('\n')[:-1].split(' ');
+    yield [int(part, 16) for part in parts]
+
+
+def Main():
+  cont_count = {}
+  for pfns in GetResultPfns('physmem_alloc_results'):
+    i1 = 0
+    i2 = 0
+    while i2 < len(pfns):
+      while i2 + 1 < len(pfns) and pfns[i2+1] - pfns[i2] == 1:
+        i2 += 1
+      size = i2 - i1 + 1
+      cont_count.setdefault(size, 0)
+      cont_count[size] += 1
+      i2 += 1
+      i1 = i2
+
+  total_pages = 0
+  for size, count in cont_count.iteritems():
+    total_pages += size * count
+
+  sorted_by_size = sorted(cont_count.iteritems())
+  for size, count in sorted_by_size:
+    size_total = size * count
+    fraction = 1.0 * size_total / total_pages
+    print '%10d %10d %10d %10.2f' % (size, count, size_total, fraction)
+
+if __name__ == '__main__':
+  Main()