linux-kernel - Re: [RFC][PATCH 1/7][memcg] virtually indexed array library.

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Date:	Tue, 27 Jul 2010 12:29:49 -0600
From:	Jonathan Corbet <corbet@....net>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	gthelen@...gle.com, m-ikeda@...jp.nec.com,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH 1/7][memcg] virtually indexed array library.

On Tue, 27 Jul 2010 16:53:03 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> This virt-array allocates a virtally contiguous array via get_vm_area()
> and allows object allocation per an element of array.

Quick question: this looks a lot like the "flexible array" mechanism
which went in around a year ago, and which is documented in
Documentation/flexible-arrays.txt.  I'm not sure we need two of
these...  That said, it appears that there are still no users of
flexible arrays.  If your virtually-indexed arrays provide something
that flexible arrays don't, perhaps your implementation should replace
flexible arrays?

Thanks,

jon
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