All of lore.kernel.org
 help / color / mirror / Atom feed
From: Pratyush Anand <panand@redhat.com>
To: linux-watchdog@vger.kernel.org
Cc: Dave Young <dyoung@redhat.com>, Don Zickus <dzickus@redhat.com>
Subject: Query: Best way to know if a watchdog is active (kicked)
Date: Tue, 18 Aug 2015 10:45:32 +0530	[thread overview]
Message-ID: <20150818051532.GC27149@dhcppc13.redhat.com> (raw)

Hi,

I am looking for the best way to know if a watchdog has been kicked and active.

I can see a way is to read timeout(WDIOC_GETTIMEOUT) and  timeleft(
WDIOC_GETTIMELEFT). If they do not match, it means that wdt is active.

But what if we tried to read timeleft just in time when watchdog daemon/or some
other application had kicked it. May be we read timeleft twice at the interval
of 1 sec.

Please let me know if there is any other alternative which could be a better way
to know if watchdog is active?  Or may be it would be good to implement an ioctl
WDIOC_ACTIVE?

Thanks

~Pratyush

             reply	other threads:[~2015-08-18  5:15 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-08-18  5:15 Pratyush Anand [this message]
2015-08-18  5:39 ` Query: Best way to know if a watchdog is active (kicked) Guenter Roeck
2015-08-18  6:57   ` Pratyush Anand
2015-08-18  9:13     ` Dave Young
2015-08-18  9:52       ` Pratyush Anand
2015-08-18 12:50     ` Guenter Roeck
2015-08-18 13:08       ` Pratyush Anand
2015-08-18 14:23         ` Guenter Roeck
2015-08-21  8:52           ` Pratyush Anand
2015-08-21 15:19             ` Guenter Roeck
2015-08-21 17:05               ` Pratyush Anand
2015-08-21 17:13                 ` Guenter Roeck
2015-08-21 17:19                   ` Pratyush Anand

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=20150818051532.GC27149@dhcppc13.redhat.com \
    --to=panand@redhat.com \
    --cc=dyoung@redhat.com \
    --cc=dzickus@redhat.com \
    --cc=linux-watchdog@vger.kernel.org \
    /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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.