netdev - Re: [PATCH/RFC] synchronize_rcu(): high latency on idle system

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Message-Id: <200801131634.17677.ak@suse.de>
Date:	Sun, 13 Jan 2008 16:34:17 +0100
From:	Andi Kleen <ak@...e.de>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
Cc:	netdev@...r.kernel.org, linux-kerne@...r.kernel.org
Subject: Re: [PATCH/RFC] synchronize_rcu(): high latency on idle system


> I think it should be in netdev_unregister_kobject().  But that would
> only get rid of one of the two calls to synchronize_rcu() in the unregister_netdev.

Would be already an improvement.

> The other synchronize_rcu() is for qdisc's and not sure if that one can
> be removed?

The standard way to remove such calls is to set a "deleted" flag in the object,
then check and ignore such objects in the reader and finally remove the object with
call_rcu

I have not checked if that is really feasible for qdiscs.

-Andi
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