linux-kernel - Re: [PATCH 4/5] mm: rework do_pages_move() to work on page

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Message-ID: <48F7AFA0.1080100@inria.fr>
Date:	Thu, 16 Oct 2008 23:18:24 +0200
From:	Brice Goglin <Brice.Goglin@...ia.fr>
To:	Christoph Lameter <cl@...ux-foundation.org>
CC:	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nathalie Furmento <nathalie.furmento@...ri.fr>
Subject: Re: [PATCH 4/5] mm: rework do_pages_move() to work on page_sized
 chunks

Christoph Lameter wrote:
>> +	err = -ENOMEM;
>> +	pm = kmalloc(PAGE_SIZE, GFP_KERNEL);
>> +	if (!pm)
>>     
>
> ok.... But if you need a page sized chunk then you can also do
> 	get_zeroed_page(GFP_KERNEL). Why bother the slab allocator for page 		sized
> allocations?
>   

Right. But why get_zeroed_page()? I don't think I need anything zeroed
(and I needed so, I would have to zero again between each chunk).

alloc_pages(order=0)+__free_pages() is probably good.

>> +		/* fill the chunk pm with addrs and nodes from user-space */
>> +		for (j = 0; j < chunk_nr_pages; j++) {
>>     
>
> j? So the chunk_start used to be i?
>   

The original "i" is somehow "chunk_start+j" now.

Thanks Christoph, I'll send an updated "4/5" patch in the next days.

Brice

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