linux-kernel - Re: [PATCH 13/17] netvm: Set PF_MEMALLOC as appropriate during SKB processing

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Message-Id: <20120517.161316.302543932768181836.davem@davemloft.net>
Date:	Thu, 17 May 2012 16:13:16 -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 13/17] netvm: Set PF_MEMALLOC as appropriate during SKB
 processing

From: Mel Gorman <mgorman@...e.de>
Date: Thu, 17 May 2012 15:50:27 +0100

> In order to make sure pfmemalloc packets receive all memory
> needed to proceed, ensure processing of pfmemalloc SKBs happens
> under PF_MEMALLOC. This is limited to a subset of protocols that
> are expected to be used for writing to swap. Taps are not allowed to
> use PF_MEMALLOC as these are expected to communicate with userspace
> processes which could be paged out.
> 
> [a.p.zijlstra@...llo.nl: Ideas taken from various patches]
> [jslaby@...e.cz: Lock imbalance fix]
> Signed-off-by: Mel Gorman <mgorman@...e.de>

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