netdev - Re: [PATCH net] netlink: call cond_resched after broadcasting updates

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Message-Id: <20141231.183838.806545236690156809.davem@davemloft.net>
Date:	Wed, 31 Dec 2014 18:38:38 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	stephen@...workplumber.org
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net] netlink: call cond_resched after broadcasting
 updates

From: Stephen Hemminger <stephen@...workplumber.org>
Date: Sat, 27 Dec 2014 09:54:33 -0800

> When a netlink event is posted to a socket, the receiving process maybe
> waiting to wakeup. Reduce the latency by calling cond_resched() in this
> loop. This reduces the problems with missed events during a netlink
> storm such as when a routing daemon does mass update in response to
> a link transition.
> 
> Signed-off-by: Stephen Hemminger <stephen@...workplumber.org>

As mentioned by others, this is potentially invoked from software
interrupts generating netlink events (one example is ipv6) so we
can't try to conditionally sleep here.
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