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From: Changli Gao <xiaosuo@gmail.com>
Date: Thu, 6 May 2010 09:25:38 +0800
Message-ID: <y2p412e6f7f1005051825g84b801bcx44e26ca58d0239c4@mail.gmail.com>
Subject: Re: [RFC] mm: generic adaptive large memory allocation APIs
To: akpm@linux-foundation.org
Cc: Eric Dumazet <eric.dumazet@gmail.com>, Jiri Slaby <jslaby@suse.cz>,
       Changli Gao <xiaosuo@gmail.com>,
       Alexander Viro <viro@zeniv.linux.org.uk>,
       "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
       Alexey Dobriyan <adobriyan@gmail.com>, Ingo Molnar <mingo@elte.hu>,
       Peter Zijlstra <peterz@infradead.org>, linux-fsdevel@vger.kernel.org,
       linux-kernel@vger.kernel.org, Avi Kivity <avi@redhat.com>,
       Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
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On Thu, May 6, 2010 at 8:30 AM, Changli Gao <xiaosuo@gmail.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@i-love.sakura.ne.jp>.



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