From: David Miller <davem@davemloft.net>
To: davidel@xmailserver.org
Cc: eric.dumazet@gmail.com, oleg@redhat.com, jolsa@redhat.com,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
fbl@redhat.com, nhorman@redhat.com, htejun@gmail.com
Subject: Re: [PATCH] net: fix race in the receive/select
Date: Thu, 25 Jun 2009 19:11:41 -0700 (PDT) [thread overview]
Message-ID: <20090625.191141.261414015.davem@davemloft.net> (raw)
In-Reply-To: <alpine.DEB.1.10.0906251858520.9517@makko.or.mcafeemobile.com>
From: Davide Libenzi <davidel@xmailserver.org>
Date: Thu, 25 Jun 2009 19:04:04 -0700 (PDT)
> On Fri, 26 Jun 2009, Eric Dumazet wrote:
>
>> Adding a plain smp_mb() in tcp_poll() for example would slowdown select()/poll() with NULL
>> timeout.
>
> Do you think of it as good design adding an MB on a subsystem, because of
> the special locking logic of another one?
> The (eventual) slowdown, IMO can be argued sideways, by saying that
> non-socket users will pay the price for their polls.
Perhaps every performance argument is moot since spin_unlock() used to
have the barrier :-)
next prev parent reply other threads:[~2009-06-26 2:11 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-25 12:25 [PATCH] net: fix race in the receive/select Jiri Olsa
2009-06-25 12:24 ` Oleg Nesterov
2009-06-26 1:31 ` Davide Libenzi
2009-06-26 1:59 ` Eric Dumazet
2009-06-26 2:04 ` Davide Libenzi
2009-06-26 2:11 ` David Miller [this message]
2009-06-26 2:19 ` Eric Dumazet
2009-06-26 3:14 ` Davide Libenzi
2009-06-26 5:42 ` Jarek Poplawski
2009-06-26 8:10 ` Jarek Poplawski
2009-06-26 13:57 ` Oleg Nesterov
2009-06-26 17:32 ` Davide Libenzi
2009-06-26 14:50 ` Oleg Nesterov
2009-06-26 18:12 ` Davide Libenzi
2009-06-26 18:17 ` David Miller
2009-06-26 19:35 ` Eric Dumazet
2009-06-29 9:34 ` Jiri Olsa
2009-06-28 11:10 ` Jarek Poplawski
2009-06-28 11:22 ` Jarek Poplawski
2009-06-28 18:04 ` Oleg Nesterov
2009-06-28 21:48 ` Jarek Poplawski
2009-06-29 9:27 ` Jiri Olsa
2009-06-26 13:46 ` Oleg Nesterov
2009-06-25 23:18 ` Eric Dumazet
2009-06-26 1:50 ` Tejun Heo
2009-06-29 9:12 ` Andi Kleen
2009-06-29 9:24 ` Jiri Olsa
2009-06-29 16:59 ` Zan Lynx
2009-06-29 17:29 ` Andi Kleen
2009-07-01 3:39 ` Herbert Xu
2009-07-01 6:27 ` Andi Kleen
2009-07-01 7:03 ` Herbert Xu
2009-07-01 7:22 ` Andi Kleen
2009-07-01 8:31 ` Herbert Xu
2009-07-01 8:44 ` Jiri Olsa
2009-07-01 10:58 ` Herbert Xu
2009-07-01 13:07 ` Herbert Xu
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