netdev - Re: [PATCH -next] net: tcp: add mib counters to track zero window transitions

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Message-ID: <20140219193213.GD1179@order.stressinduktion.org>
Date:	Wed, 19 Feb 2014 20:32:13 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Florian Westphal <fw@...len.de>,
	Eric Dumazet <eric.dumazet@...il.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH -next] net: tcp: add mib counters to track zero window transitions

Sorry...

On Wed, Feb 19, 2014 at 08:30:38PM +0100, Hannes Frederic Sowa wrote:
> NET_STATS only use 32 bit counter and thus need not be protected with a
> seqlock on 32 bit platforms. As such, it does not matter, but e.g. the IP
> counter are prone to deadlocks if used with wrong postfix because of 64 bit
> counter thus protected by seqlock.
> 
> A pitty that the _STATS_BH postfixes have the opposite meaning of the bottom

	s/bottom$/locking/

> _bh postfixes.
> 
> Basically always safe is _STATS and if we are sure we can omit the bh disable
> call because we only call the function from bh, we can use _STATS_BH calls.

Should read mails again before sending. ;)

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