linux-kernel - Re: [PATCH] fs: use kmalloc() to allocate fdmem if possible

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Message-ID: <4BDE9504.8030401@suse.cz>
Date:	Mon, 03 May 2010 11:19:00 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Avi Kivity <avi@...hat.com>, Changli Gao <xiaosuo@...il.com>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	akpm@...ux-foundation.org, paulmck@...ux.vnet.ibm.com,
	adobriyan@...il.com, mingo@...e.hu, peterz@...radead.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fs: use kmalloc() to allocate fdmem if possible

On 05/03/2010 11:13 AM, Eric Dumazet wrote:
> /*
>  * Warning: if size is not a power of two, kmalloc() might
>  * waste memory because of its requirements.
>  */
> void *kvmalloc(size_t size)
> {
> 	void *ptr = kmalloc(size, GFP_KERNEL | __GFP_NOWARN);

This is kind of waste of high-order pages, isn't it? Wouldn't it be
better to have a watermark where we skip kmalloc completely?

> 
> 	if (ptr)
> 		return ptr;
> 	return vmalloc(size);
> }



-- 
js
suse labs
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