linux-kernel - Re: [PATCH 1/7] mm: introduce simple_malloc()/simple

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Message-ID: <20081115205229.765f7ee3@infradead.org>
Date:	Sat, 15 Nov 2008 20:52:29 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Menage <menage@...gle.com>,
	kamezawa.hiroyu@...fujitsu.com,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	"David S. Miller" <davem@...emloft.net>, Jan Kara <jack@...e.cz>,
	Jes Sorensen <jes@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/7] mm: introduce simple_malloc()/simple_free()

On Sun, 16 Nov 2008 12:33:15 +0800
Lai Jiangshan <laijs@...fujitsu.com> wrote:

> 
> some subsystem needs vmalloc() when required memory is large.
> but current kernel has not APIs for this requirement.
> this patch introduces simple_malloc() and simple_free().

Hi

I kinda really don't like this approach. vmalloc() (and especially,
vfree()) is a really expensive operation, and vmalloc()'d memory is
also slower (due to tlb pressure). Realistically, people should try hard
to use small datastructure instead....


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
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