linux-kernel - Re: [PATCH v3] netfilter: nf_conntrack: use safer way to lock all buckets

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Message-ID: <20160119190938.GA25130@salvia>
Date:	Tue, 19 Jan 2016 20:09:38 +0100
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	kaber@...sh.net, kadlec@...ckhole.kfki.hu, davem@...emloft.net,
	netfilter-devel@...r.kernel.org, coreteam@...filter.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] netfilter: nf_conntrack: use safer way to lock all
 buckets

On Mon, Jan 18, 2016 at 07:23:51PM -0500, Sasha Levin wrote:
> When we need to lock all buckets in the connection hashtable we'd attempt to
> lock 1024 spinlocks, which is way more preemption levels than supported by
> the kernel. Furthermore, this behavior was hidden by checking if lockdep is
> enabled, and if it was - use only 8 buckets(!).
> 
> Fix this by using a global lock and synchronize all buckets on it when we
> need to lock them all. This is pretty heavyweight, but is only done when we
> need to resize the hashtable, and that doesn't happen often enough (or at all).
> 
> Acked-by: Jesper Dangaard Brouer <brouer@...hat.com>
> Signed-off-by: Sasha Levin <sasha.levin@...cle.com>

Applied, thanks.

I'm including the Reviewed-by tag from Florian in this patch.