_damo_records/MemFootprint: Support constructor without parameter

Signed-off-by: SeongJae Park <sj@kernel.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/_damo_records.py b/_damo_records.py
index 1b535c80..b1613d87 100644
--- a/_damo_records.py
+++ b/_damo_records.py
@@ -528,7 +528,10 @@ class MemFootprint:
     drs = None
     dt = None
 
-    def __init__(self, pid):
+    def __init__(self, pid=None):
+        if pid is None:
+            return
+
         with open('/proc/%s/statm' % pid, 'r') as f:
             fields = [int(x) for x in f.read().split()]
         self.size = fields[0]