linux-kernel - Re: [PATCH] netlink: Re-add locking to netlink

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Message-ID: <20141021070424.GA4161@osiris>
Date:	Tue, 21 Oct 2014 09:04:24 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	paulmck@...ux.vnet.ibm.com,
	Nikolay Aleksandrov <nikolay@...hat.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Ursula Braun <braunu@...ibm.com>
Subject: Re: [PATCH] netlink: Re-add locking to netlink_lookup() and seq
 walker

On Mon, Oct 20, 2014 at 08:53:55PM +0100, Thomas Graf wrote:
> Heiko,
> 
> Can you test the following patch:
> 
> The synchronize_rcu() in netlink_release() introduces unacceptable
> latency. Reintroduce minimal lookup so we can drop the
> synchronize_rcu() until socket destruction has been RCUfied.
> 
> Signed-off-by: Thomas Graf <tgraf@...g.ch>
> ---
>  net/netlink/af_netlink.c | 37 +++++++++++++++++++++++++------------
>  1 file changed, 25 insertions(+), 12 deletions(-)

Thanks a lot! Your patch fixes the issue for me.

Reported-and-tested-by: Heiko Carstens <heiko.carstens@...ibm.com>

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