linux-kernel - Re: [PATCH 11/16] netvm: Propagate page->pfmemalloc from skb_alloc

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Date:	Mon, 9 Jul 2012 21:18:56 +0200
From:	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>,
	Linux-Netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>, Neil Brown <neilb@...e.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Christie <michaelc@...wisc.edu>,
	Eric B Munson <emunson@...bm.net>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH 11/16] netvm: Propagate page->pfmemalloc from
 skb_alloc_page to skb

On Wed, Jun 27, 2012 at 09:43:48AM +0100, Mel Gorman wrote:
> > You did not touch all drivers which use alloc_page(s)() like e1000(e). Was
> > this on purpose?
> 
> Yes. The ones I changed were the semi-obvious ones and carried over from
> when the patches were completely out of tree.  As the changelog notes
> it is not critical that these annotation happens and can be fixed on a
> per-driver basis if there are complains about network swapping being slow.
okay, I was just curious why some drivers were updated and others not.

> I can update e1000 if you like but it's not critical
> to do so and in fact getting a bug reporting saying that network swap
> was slow on e1000 would be useful to me in its own way :)
No, leave as it, I was just curious.
One thing: Do you think it makes sense to you introduce
	#define GFP_NET_RX     (GFP_ATOMIC | __GFP_MEMALLOC)

and use it within the receive path instead of GFP_ATOMIC?

Sebastian
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