linux-kernel - Re: [PATCH RT] net: move xmit_recursion to per-task variable on -RT

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Date:	Thu, 14 Jan 2016 14:20:04 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	Steven Rostedt <rostedt@...dmis.org>, netdev@...r.kernel.org
Subject: Re: [PATCH RT] net: move xmit_recursion to per-task variable on -RT

On Thu, 2016-01-14 at 23:02 +0100, Hannes Frederic Sowa wrote:

> We are just adding a second recursion limit solely to openvswitch which 
> has the same problem:
> 
> https://patchwork.ozlabs.org/patch/566769/
> 
> This time also we depend on rcu_read_lock marking the section being 
> nonpreemptible. Nice would be a more generic solution here which doesn't 
> need to always add something to *current.


Note that rcu_read_lock() does not imply that preemption is disabled.