netdev - Re: [Patch net 00/15] net_sched: remove RCU callbacks from TC

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Date:   Wed, 25 Oct 2017 10:43:53 +0900 (KST)
From:   David Miller <davem@...emloft.net>
To:     xiyou.wangcong@...il.com
Cc:     netdev@...r.kernel.org, paulmck@...ux.vnet.ibm.com,
        jhs@...atatu.com, john.fastabend@...il.com, chrism@...lanox.com
Subject: Re: [Patch net 00/15] net_sched: remove RCU callbacks from TC

From: Cong Wang <xiyou.wangcong@...il.com>
Date: Mon, 23 Oct 2017 15:02:49 -0700

> Recently, the RCU callbacks used in TC filters and TC actions keep
> drawing my attention, they introduce at least 4 race condition bugs:

Like Eric, I think doing a full RCU sync on every delete is too big
a pill to swallow.  This is a major control plane performance
regression.

Please find another reasonable way to fix this.

Thank you.