netdev - Re: [PATCH net-next-2.6] loopback: Implement 64bit stats on 32bit arches

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Date:	Mon, 14 Jun 2010 23:14:12 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, bhutchings@...arflare.com
Subject: Re: [PATCH net-next-2.6] loopback: Implement 64bit stats on 32bit
 arches

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Mon, 14 Jun 2010 17:59:22 +0200

> Uses a seqcount_t to synchronize stat producer and consumer, for packets
> and bytes counter, now u64 types.
> 
> (dropped counter being rarely used, stay a native "unsigned long" type)
> 
> No noticeable performance impact on x86, as it only adds two increments
> per frame. It might be more expensive on arches where smp_wmb() is not
> free.
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Applied, but I suspect we might end up eventually needing to
abstract this kind of technique in a common place so other
spots can use it.
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