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-rw-r--r--tools/xenmon/xenmon.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/tools/xenmon/xenmon.py b/tools/xenmon/xenmon.py
index 1b74d19403..402b6b4e18 100644
--- a/tools/xenmon/xenmon.py
+++ b/tools/xenmon/xenmon.py
@@ -672,6 +672,9 @@ def main():
parser = setup_cmdline_parser()
(options, args) = parser.parse_args()
+ if options.mspersample < 0:
+ parser.error("option --ms_per_sample: invalid negative value: '%d'" %
+ options.mspersample)
start_xenbaked()
if options.live: