linux-kernel - Re: [PATCH 09/17] netvm: Allow the use of __GFP

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Date:	Fri, 11 May 2012 00:50:34 -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 09/17] netvm: Allow the use of __GFP_MEMALLOC by
 specific sockets

From: Mel Gorman <mgorman@...e.de>
Date: Thu, 10 May 2012 14:45:02 +0100

> Allow specific sockets to be tagged SOCK_MEMALLOC and use
> __GFP_MEMALLOC for their allocations. These sockets will be able to go
> below watermarks and allocate from the emergency reserve. Such sockets
> are to be used to service the VM (iow. to swap over). They must be
> handled kernel side, exposing such a socket to user-space is a bug.
> 
> There is a risk that the reserves be depleted so for now, the
> administrator is responsible for increasing min_free_kbytes as
> necessary to prevent deadlock for their workloads.
> 
> [a.p.zijlstra@...llo.nl: Original patches]
> Signed-off-by: Mel Gorman <mgorman@...e.de>

After sk_allocation() is adjusted to be sk_gfp_atomic() as I suggested
in my feedback for patch #8, this is fine.
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