netdev - Re: [RFC] question about inet_listen_lock(), and [PATCH] net: listening

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Message-Id: <20081119.154153.233063184.davem@davemloft.net>
Date:	Wed, 19 Nov 2008 15:41:53 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	dada1@...mosbay.com
Cc:	netdev@...r.kernel.org
Subject: Re: [RFC] question about inet_listen_lock(), and [PATCH] net:
 listening_hash get a spinlock per bucket

From: Eric Dumazet <dada1@...mosbay.com>
Date: Mon, 17 Nov 2008 17:21:19 +0100

> I was looking at converting tcp ehash/listening_hash rwlocks to spinlocks, and found
> inet_listen_lock()/unlock() definition :

I've known about this weird "bump a counter and sleep" locking thing we do
for listening sockets, but I haven't been able yet to track down the history
and understand why we do this.

There really was a reason, and your suspicion about /proc/net/tcp might be
correct, and of course doesn't really apply these days.

But I don't know for sure yet, and I'd rather not apply thing until I do.

Give me some more time to do the history search, thanks.
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