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From: David Miller <davem@davemloft.net>
To: herbert@gondor.apana.org.au
Cc: eric.dumazet@gmail.com, tgraf@suug.ch, netdev@vger.kernel.org,
	ying.xue@windriver.com
Subject: Re: [net-next] netlink: Use random autobind rover
Date: Sun, 17 May 2015 23:44:07 -0400 (EDT)	[thread overview]
Message-ID: <20150517.234407.1144377163556453362.davem@davemloft.net> (raw)
In-Reply-To: <20150517024534.GA5570@gondor.apana.org.au>

From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Sun, 17 May 2015 10:45:34 +0800

> On Sat, May 16, 2015 at 05:08:19PM -0400, David Miller wrote:
>>
>> As far as I can tell, this ought to be fine as-is.
> 
> OK what about dropping the global rover altogether? Let's just
> start randomly like UDP.
> 
> ---8<---
> Currently we use a global rover to select a port ID that is unique.
> This used to work consistently when it was protected with a global
> lock.  However as we're now lockless, the global rover can exhibit
> pathological behaviour should multiple threads all stomp on it at
> the same time.
> 
> Granted this will eventually resolve itself but the process is
> suboptimal.
> 
> This patch replaces the global rover with a pseudorandom starting
> point to avoid this issue.
> 
> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Yep, this is fine, applied.

Thanks!

  reply	other threads:[~2015-05-18  3:44 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-05-13  5:30 netlink & rhashtable status Eric Dumazet
2015-05-13  5:40 ` Herbert Xu
2015-05-13  6:15   ` Eric Dumazet
2015-05-13  6:20     ` Herbert Xu
2015-05-13 13:04       ` Eric Dumazet
2015-05-13 16:18         ` Eric Dumazet
2015-05-13 16:35           ` David Miller
2015-05-14  2:55             ` Herbert Xu
2015-05-14  2:53           ` Herbert Xu
2015-05-14  3:17             ` Eric Dumazet
2015-05-14  3:34               ` Herbert Xu
2015-05-14  3:58                 ` Eric Dumazet
2015-05-14  4:13                   ` Eric Dumazet
2015-05-14  4:16                     ` Herbert Xu
2015-05-14  4:21                       ` Herbert Xu
2015-05-14  4:38                         ` Eric Dumazet
2015-05-14  5:03                           ` Herbert Xu
2015-05-14  5:56                         ` Red Hat INTERNAL-ONLY kernel discussion list <rhkernel-list@redhat.com> Herbert Xu
2015-05-14  5:58                         ` netlink: Disable insertions/removals during rehash Herbert Xu
2015-05-14  6:02                           ` netlink: Kill bogus lock_sock in netlink_insert Herbert Xu
2015-05-15 16:49                             ` David Miller
2015-05-15 18:01                               ` Eric Dumazet
2015-05-16 16:50                                 ` Eric Dumazet
2015-05-16 20:58                                   ` David Miller
2015-05-15 17:02                             ` David Miller
2015-05-16 12:32                               ` Herbert Xu
2015-05-16 13:40                                 ` [net] netlink: Make autobind rover an atomic_t Herbert Xu
2015-05-16 13:50                                   ` [net] netlink: Reset portid after netlink_insert failure Herbert Xu
2015-05-16 21:09                                     ` David Miller
2015-05-16 21:08                                   ` [net] netlink: Make autobind rover an atomic_t David Miller
2015-05-17  2:45                                     ` [net-next] netlink: Use random autobind rover Herbert Xu
2015-05-18  3:44                                       ` David Miller [this message]
2015-05-14 14:37                           ` netlink: Disable insertions/removals during rehash Eric Dumazet
2015-05-15  0:06                             ` Herbert Xu
2015-05-20 23:53                               ` Thomas Graf
2015-05-21  0:31                                 ` Eric Dumazet
2015-05-15 17:02                           ` David Miller
2015-05-16 13:16                             ` Herbert Xu
2015-05-16 21:10                               ` David Miller
2015-06-04 16:27                                 ` Guenter Roeck
2015-06-04 18:59                                   ` David Miller
2015-06-04 20:44                                     ` Eric Dumazet
2015-06-04 20:58                                     ` Guenter Roeck
2015-06-05  3:52                                   ` Herbert Xu
2015-06-05  5:27                                     ` Guenter Roeck
2015-06-26 10:44                         ` netlink & rhashtable status Konstantin Khlebnikov
2015-06-27  7:09                           ` Herbert Xu
2015-05-14  4:17                     ` Eric Dumazet

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