netdev - Re: [PATCH RFC] ipv6_fib limit spinlock hold times for /proc/net/ipv6

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Message-ID: <535E8E01.6070908@fb.com>
Date:	Mon, 28 Apr 2014 13:21:05 -0400
From:	Chris Mason <clm@...com>
To:	David Miller <davem@...emloft.net>
CC:	<netdev@...r.kernel.org>
Subject: Re: [PATCH RFC] ipv6_fib limit spinlock hold times for /proc/net/ipv6_route

On 04/26/2014 12:11 AM, David Miller wrote:
> From: Chris Mason <clm@...com>
> Date: Fri, 25 Apr 2014 16:27:21 -0400
>
>> Ah ok, so the rtnl mutex can replace rcu_read_lock().  Will it end up
>> blocking any traffic? (sorry, filesystem guys are a little slow)
>
> It stops networking configuration operations.
>
> BTW, this means that netlink based ipv6 route dumps can be
> optimized similarly.  Because those code paths implicitly
> hold the RTNL mutex.
>

Ok, the rtnl mutex looks like a much better path.  I'll give it a shot 
this week.

If anyone working on patches in this area wants help testing, just let 
me know.

-chris
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