From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sasha Levin Subject: Re: [PATCH] netfilter: nf_conntrack: use safer way to lock all buckets Date: Wed, 13 Jan 2016 13:37:33 -0500 Message-ID: <5696996D.20602@oracle.com> References: <1451960746-28915-1-git-send-email-sasha.levin@oracle.com> <20160110010637.GA22861@breakpoint.cc> <20160113165422.GA20585@salvia> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Cc: Florian Westphal , kaber@trash.net, kadlec@blackhole.kfki.hu, davem@davemloft.net, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org To: Pablo Neira Ayuso Return-path: In-Reply-To: <20160113165422.GA20585@salvia> Sender: linux-kernel-owner@vger.kernel.org List-Id: netfilter-devel.vger.kernel.org On 01/13/2016 11:54 AM, Pablo Neira Ayuso wrote: > On Sun, Jan 10, 2016 at 02:06:37AM +0100, Florian Westphal wrote: >> > Sasha Levin wrote: >>> > > 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). >> > >>> > > diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c >>> > > index 3cb3cb8..3c008ce 100644 >>> > > --- a/net/netfilter/nf_conntrack_core.c >>> > > +++ b/net/netfilter/nf_conntrack_core.c >>> > > @@ -66,6 +66,32 @@ EXPORT_SYMBOL_GPL(nf_conntrack_locks); >>> > > __cacheline_aligned_in_smp DEFINE_SPINLOCK(nf_conntrack_expect_lock); >>> > > EXPORT_SYMBOL_GPL(nf_conntrack_expect_lock); >>> > > >>> > > +spinlock_t nf_conntrack_locks_all_lock; >>> > > +bool nf_conntrack_locks_all; >> > >> > Seems both of these can be static and __read_mostly too -- >> > as you already note resizing virtually never happens. >> > >> > Otherwise: >> > Reviewed-by: Florian Westphal > Sasha, would you resubmit addressing Florian's feedback? Yup, sorry - still catching up with the holidays vacation :( Thanks, Sasha