linux-kernel - Re: [PATCH -mm] relayfs: support larger relay buffer take 2

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Message-ID: <480646B2.9000905@redhat.com>
Date:	Wed, 16 Apr 2008 14:34:26 -0400
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Pekka J Enberg <penberg@...helsinki.fi>
CC:	Tom Zanussi <zanussi@...cast.net>,
	David Wilder <dwilder@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	systemtap-ml <systemtap@...rces.redhat.com>,
	LKML <linux-kernel@...r.kernel.org>, tzanussi@...il.com
Subject: Re: [PATCH -mm] relayfs: support larger relay buffer take 2

Hi,

Pekka J Enberg wrote:
> Hi Masami,
> 
> On Wed, 16 Apr 2008, Masami Hiramatsu wrote:
>> +static struct page *relay_alloc_page_array(unsigned int n_pages)
>> +{
>> +	struct page *array;
>> +	unsigned int pa_size = n_pages * sizeof(struct page *);
>> +
>> +	if (pa_size > PAGE_SIZE) {
>> +		array = vmalloc(pa_size);
>> +		if (array)
>> +			memset(array, 0, pa_size);
>> +	} else {
>> +		array = kcalloc(n_pages, sizeof(struct page *), GFP_KERNEL);
>> +	}
>> +	return array;
>> +}
> 
> I think it's bit confusing to have relay_alloc_page_array() return a 
> pointer to struct page as it's really allocating an _array_ of pointers to 
> struct page. So why not just use void * here as the kernel memory 
> allocators do?

Thank you very much, it was my mistake.
It should return struct page **.

>> +static void relay_free_page_array(struct page *array)
>> +{
>> +	if (is_vmalloc_addr(array))
>> +		vfree(array);
>> +	else
>> +		kfree(array);
>> +}
> 
> Here as well.

Thanks,


-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com

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