netdev - Re: [PATCH 10/17] netvm: Allow skb allocation to use PFMEMALLOC reserves

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Message-ID: <20120621164329.GA6195@breakpoint.cc>
Date:	Thu, 21 Jun 2012 18:43:29 +0200
From:	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>,
	Mel Gorman <mgorman@...e.de>,
	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>
Subject: Re: [PATCH 10/17] netvm: Allow skb allocation to use PFMEMALLOC
 reserves

> > This is mostly used by nic to refil their RX skb pool. You add the
> > __GFP_MEMALLOC to the allocation to rise the change of a successfull refill
> > for the swap case.
> > A few drivers use build_skb() to create the skb. __netdev_alloc_skb()
> > shouldn't be affected since the allocation happens with GFP_ATOMIC. Looking at
> > TG3 it uses build_skb() and get_pages() / kmalloc(). Shouldn't this be some
> > considered?
> 
> Please look at net-next, this was changed recently.
> 
> In fact most RX allocations are done using netdev_alloc_frag(), because
> its called from __netdev_alloc_skb()

Argh, this is what I meant more or less. I got the flag magic wrong so I assumed
that this is only called without GFP_ATOMIC but it is not. Thanks for the
hint.

> So tg3 is not anymore the exception, but the norm.

Sebastian
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