linux-kernel - Re: getaddrinfo slowdown in 3.17.1, due to getifaddrs

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Message-ID: <1413580764.27176.12.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Fri, 17 Oct 2014 14:19:24 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	tgraf@...g.ch, sgunderson@...foot.com,
	linux-kernel@...r.kernel.org, nikolay@...hat.com
Subject: Re: getaddrinfo slowdown in 3.17.1, due to getifaddrs

On Fri, 2014-10-17 at 12:30 -0400, David Miller wrote:

> Can I ask a serious question?  What is the synchronize_net() in AF_NETLINK
> exactly needed for?

__netlink_lookup() calls rhashtable_lookup_compare()

So you really want that any object found in this lookup respects
rcu grace period before being freed.

RCU contract is pretty clear about deletions of objects.



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