Re: [PATCH 6/6] cls_cgroup: remove redundant rcu_read_lock/unlock

From: David Miller
Date: Wed Feb 01 2012 - 02:11:14 EST

From: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Date: Wed, 01 Feb 2012 08:07:19 +0100

> Then, I wonder why we do the "if (classid && classid != sk->sk_classid)"
> before the :
> sk->sk_classid = classid;
> This seems unnecessary checks.

Avoiding dirtying the sk->sk_classid cache line unnecessarily?

I actually have no idea actually how often this routine can get
invoked in real world scenerios.
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