linux-kernel - Re: [RFC] tcp: race in receive part

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Message-ID: <20090623194449.GB28836@redhat.com>
Date:	Tue, 23 Jun 2009 21:44:49 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Jiri Olsa <jolsa@...hat.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, fbl@...hat.com, nhorman@...hat.com,
	davem@...hat.com
Subject: Re: [RFC] tcp: race in receive part

(Off-topic)

On 06/23, Eric Dumazet wrote:
>
> The optimization we could do, defining
> a smp_mb_after_read_lock() that could be a nop on x86

Imho it would be nice to have smp_mb__before/after_lock.

insert_work(), __pte_alloc(), try_to_wake_up() could use it. Probably
something else.

Oleg.

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