linux-kernel - Re: [RFC] mm: generic adaptive large memory allocation APIs

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Date:	Thu, 6 May 2010 09:25:38 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	akpm@...ux-foundation.org
Cc:	Eric Dumazet <eric.dumazet@...il.com>, Jiri Slaby <jslaby@...e.cz>,
	Changli Gao <xiaosuo@...il.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Avi Kivity <avi@...hat.com>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Subject: Re: [RFC] mm: generic adaptive large memory allocation APIs

On Thu, May 6, 2010 at 8:30 AM, Changli Gao <xiaosuo@...il.com> wrote:
> kvmalloc() will try to allocate physically contiguous memory first, and try
> vmalloc to allocate virtually contiguous memory when the former allocation
> fails.
>
> kvfree() is used to free the memory allocated by kvmalloc(). It can't be used
> in atomic context. If the callers are in atomic contex, they can use
> kvfree_inatomic() instead.
>
> There is much duplicate code to do such things in kernel, so I generate the
> above APIs.
>
> Thank Eric Dumazet for the "kv" prefix. :)
>
> #include <linux/kernel.h>
> #include <linux/module.h>
> #include <linux/mm.h>
> #include <linux/init.h>
> #include <linux/slab.h>
> #include <linux/vmalloc.h>
> #include <linux/interrupt.h>
>
> void *kvmalloc(size_t size)
> {
>        void *ptr;
>
>        if (size < PAGE_SIZE)
>                return kmalloc(PAGE_SIZE, GFP_KERNEL);

typo mistake, should be kmalloc(size, GFP_KERNEL), thank Tetsuo Handa
<penguin-kernel@...ove.sakura.ne.jp>.



-- 
Regards，
Changli Gao(xiaosuo@...il.com)
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