netdev - newbie question about qdisc_watchdog

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Message-ID: <p2u7d5af59c1004061952o9037e7efqce4eb29362819494@mail.gmail.com>
Date:	Tue, 6 Apr 2010 20:52:13 -0600
From:	Yongjian Zhang <brianzhang2007@...il.com>
To:	netdev@...r.kernel.org
Subject: newbie question about qdisc_watchdog_schedule

Hi all,

I have a newbie question about qdisc_watchdog_schedule(). This
function appears in the source code of several qdiscs and it seems to
be used when the qdisc is asked to dequeue a packet but cannot.

I tried to trace the source code but only found some function calls to
start a timer. No callback function seems to be involved...

Google did not give me any documentation to this function either...

Can anyone maybe show me what does qdisc_watchdog_schedule() do and/or
why we have to call it when there's no packet to dequeue?

Thanks a lot!

Jack
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