Date: Sat, 19 May 2007 11:54:42 -0700 (PDT)
Message-Id: <20070519.115442.30184476.davem@davemloft.net>
To: dada1@cosmosbay.com
Cc: akpm@linux-foundation.org, dhowells@redhat.com, linux-mm@kvack.org,
       linux-kernel@vger.kernel.org
Subject: Re: [PATCH] MM : alloc_large_system_hash() can free some memory
 for non power-of-two bucketsize
From: David Miller <davem@davemloft.net>
In-Reply-To: <464F3CCF.2070901@cosmosbay.com>
References: <20070518115454.d3e32f4d.dada1@cosmosbay.com>
	<20070519013724.3d4b74e0.akpm@linux-foundation.org>
	<464F3CCF.2070901@cosmosbay.com>
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From: Eric Dumazet <dada1@cosmosbay.com>
Date: Sat, 19 May 2007 20:07:11 +0200

> Maybe David has an idea how this can be done properly ?
> 
> ref : http://marc.info/?l=linux-netdev&m=117706074825048&w=2

You need to use __GFP_COMP or similar to make this splitting+freeing
thing work.

Otherwise the individual pages don't have page references, only
the head page of the high-order page will.
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