netdev - Re: More prefetch fall-out

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Message-ID: <1306090303.12435.35.camel@edumazet-laptop>
Date:	Sun, 22 May 2011 20:51:43 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	David Miller <davem@...emloft.net>,
	Network Development <netdev@...r.kernel.org>
Subject: Re: More prefetch fall-out

Le dimanche 22 mai 2011 à 11:38 -0700, Linus Torvalds a écrit :
> On Sun, May 22, 2011 at 11:23 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> >
> > Taking a look at various skb_queue_walk* call sites, I think prefetches
> > are not a clear win, I would just remove them all from skbuff.h
> 
> Hmm.
> 
> I did that, and it turns out that we also have:
> 
>  - *lots* of network drivers that use "prefetch" (without including prefetch.h)
>  - net/netlabel/netlabel_addrlist.h doing the same.
> 
> and fixing that up is annoying "grunt work".
> 
> So for now, I think I'll just do the "add the <linux/prefetch.h> to
> <linux/skbuff.h>" thing, and leave networking alone. That makes
> everything compile ("allyesconfig") even with my "you *have* to
> include <linux/prefetch.h>" test-patch.
> 

Or include <linux/prefetch.h> from linux/skbuff.h but remove the
prefetch() calls...

BTW this reminds me Andi Kleen prior patch

http://linux.derkeiler.com/Mailing-Lists/Kernel/2010-09/msg03096.html




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