From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH net-next] pkt_sched: add cond_resched() to class and
 qdisc dump
Date: Mon, 10 Mar 2014 15:32:05 -0400 (EDT)
Message-ID: <20140310.153205.851677230247140352.davem@davemloft.net>
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From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Fri, 07 Mar 2014 18:01:04 -0800

> From: Eric Dumazet <edumazet@google.com>
> 
> We have seen delays of more than 50ms in class or qdisc dumps, in case
> device is under high TX stress.
> 
> Add cond_resched() to give a chance to higher prio tasks to get cpu.
> 
> Signed-off-by: Eric Dumazet <edumazet@google.com>

Is it OK to sleep (or rather: cond_resched()) in an RCU region?
That's what will potentially happen via tc_dump_qdisc() it seems.