linux-kernel - [PATCH 3/4] iocost_monitor: exit successfully if interval is zero

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Date:   Mon, 13 Apr 2020 12:27:57 -0400
From:   Tejun Heo <tj@...nel.org>
To:     axboe@...nel.dk
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...com, cgroups@...r.kernel.org, newella@...com,
        josef@...icpanda.com, asml.silence@...il.com, ming.lei@...hat.com,
        bvanassche@....org, Tejun Heo <tj@...nel.org>
Subject: [PATCH 3/4] iocost_monitor: exit successfully if interval is zero

This is to help external tools to decide whether iocost_monitor has all its
requirements met or not based on the exit status of an -i0 run.

Signed-off-by: Tejun Heo <tj@...nel.org>
---
 tools/cgroup/iocost_monitor.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/cgroup/iocost_monitor.py b/tools/cgroup/iocost_monitor.py
index 7427a5ee761b..eb2363b868c5 100644
--- a/tools/cgroup/iocost_monitor.py
+++ b/tools/cgroup/iocost_monitor.py
@@ -28,7 +28,8 @@ parser.add_argument('devname', metavar='DEV',
 parser.add_argument('--cgroup', action='append', metavar='REGEX',
                     help='Regex for target cgroups, ')
 parser.add_argument('--interval', '-i', metavar='SECONDS', type=float, default=1,
-                    help='Monitoring interval in seconds')
+                    help='Monitoring interval in seconds (0 exits immediately '
+                    'after checking requirements)')
 parser.add_argument('--json', action='store_true',
                     help='Output in json')
 args = parser.parse_args()
@@ -243,6 +244,9 @@ ioc = None
 if ioc is None:
     err(f'Could not find ioc for {devname}');
 
+if interval == 0:
+    sys.exit(0)
+
 # Keep printing
 while True:
     now = time.time()
-- 
2.25.2