linux-kernel - Re: [PATCH net-next v2 3/3] ipv6: per netns FIB garbage collection

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Message-ID: <CAM_iQpUtASVdE=EHGADgaSPWkxnnoafMNyaDvbSo=V0DvD_ivA@mail.gmail.com>
Date:	Tue, 8 Mar 2016 10:36:17 -0800
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Michal Kubecek <mkubecek@...e.cz>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Martin KaFai Lau <kafai@...com>
Subject: Re: [PATCH net-next v2 3/3] ipv6: per netns FIB garbage collection

On Tue, Mar 8, 2016 at 5:44 AM, Michal Kubecek <mkubecek@...e.cz> wrote:
> One of our customers observed issues with FIB6 garbage collectors
> running in different network namespaces blocking each other, resulting
> in soft lockups (fib6_run_gc() initiated from timer runs always in
> forced mode).
>
> Now that FIB6 walkers are separated per namespace, there is no more need
> for instances of fib6_run_gc() in different namespaces blocking each
> other. There is still a call to icmp6_dst_gc() which operates on shared
> data but this function is protected by its own shared lock.
>
> Signed-off-by: Michal Kubecek <mkubecek@...e.cz>


Reviewed-by: Cong Wang <xiyou.wangcong@...il.com>