linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Tejun Heo <tj@kernel.org>
To: axboe@kernel.dk
Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
	kernel-team@vger.kernel.org, cgroups@vger.kernel.org,
	newella@fb.com, josef@toxicpanda.com, Tejun Heo <tj@kernel.org>
Subject: [PATCH 4/5] iocost_monitor: exit successfully if interval is zero
Date: Wed,  8 Apr 2020 16:14:49 -0400	[thread overview]
Message-ID: <20200408201450.3959560-5-tj@kernel.org> (raw)
In-Reply-To: <20200408201450.3959560-1-tj@kernel.org>

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@kernel.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()
-- 
2.25.1


  parent reply	other threads:[~2020-04-08 20:15 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-08 20:14 [PATCHSET block/for-5.8] iocost: improve use_delay and latency target handling Tejun Heo
2020-04-08 20:14 ` [PATCH 1/5] blk-iocost: switch to fixed non-auto-decaying use_delay Tejun Heo
2020-04-08 20:14 ` [PATCH 2/5] block: add request->io_data_len Tejun Heo
2020-04-09  1:44   ` Ming Lei
2020-04-09  2:11     ` Tejun Heo
2020-04-09  2:38       ` Ming Lei
2020-04-09  5:08         ` Pavel Begunkov
2020-04-13 14:02           ` Tejun Heo
2020-04-13 13:56         ` Tejun Heo
2020-04-09  3:44   ` Bart Van Assche
2020-04-13 13:52     ` Tejun Heo
2020-04-08 20:14 ` [PATCH 3/5] blk-iocost: account for IO size when testing latencies Tejun Heo
2020-04-08 20:14 ` Tejun Heo [this message]
2020-04-08 20:14 ` [PATCH 5/5] iocost_monitor: drop string wrap around numbers when outputting json Tejun Heo

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200408201450.3959560-5-tj@kernel.org \
    --to=tj@kernel.org \
    --cc=axboe@kernel.dk \
    --cc=cgroups@vger.kernel.org \
    --cc=josef@toxicpanda.com \
    --cc=kernel-team@vger.kernel.org \
    --cc=linux-block@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=newella@fb.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).