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

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Message-Id: <20120517.161245.2279668542058844372.davem@davemloft.net>
Date:	Thu, 17 May 2012 16:12:45 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	mgorman@...e.de
Cc:	akpm@...ux-foundation.org, linux-mm@...ck.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	neilb@...e.de, a.p.zijlstra@...llo.nl, michaelc@...wisc.edu,
	emunson@...bm.net
Subject: Re: [PATCH 10/17] netvm: Allow skb allocation to use PFMEMALLOC
 reserves

From: Mel Gorman <mgorman@...e.de>
Date: Thu, 17 May 2012 15:50:24 +0100

> Change the skb allocation API to indicate RX usage and use this to fall
> back to the PFMEMALLOC reserve when needed. SKBs allocated from the
> reserve are tagged in skb->pfmemalloc. If an SKB is allocated from
> the reserve and the socket is later found to be unrelated to page
> reclaim, the packet is dropped so that the memory remains available
> for page reclaim. Network protocols are expected to recover from this
> packet loss.
> 
> [davem@...emloft.net: Use static branches, coding style corrections]
> [a.p.zijlstra@...llo.nl: Ideas taken from various patches]
> Signed-off-by: Mel Gorman <mgorman@...e.de>

Acked-by: David S. Miller <davem@...emloft.net>
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