linux-kernel - Re: [PATCH] MM : alloc_large_system_hash() can free some memory for non power-of-two bucketsize

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Message-Id: <20070519.115442.30184476.davem@davemloft.net>
Date:	Sat, 19 May 2007 11:54:42 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	dada1@...mosbay.com
Cc:	akpm@...ux-foundation.org, dhowells@...hat.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] MM : alloc_large_system_hash() can free some memory
 for non power-of-two bucketsize

From: Eric Dumazet <dada1@...mosbay.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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