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

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Date:	Wed, 16 Apr 2008 10:36:46 -0400
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Pekka Enberg <penberg@...helsinki.fi>
CC:	David Wilder <dwilder@...ibm.com>,
	Tom Zanussi <zanussi@...cast.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	systemtap-ml <systemtap@...rces.redhat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -mm] relayfs: support larger relay buffer

Hi Pekka,

Pekka Enberg wrote:
> On Tue, Apr 15, 2008 at 6:27 PM, Masami Hiramatsu <mhiramat@...hat.com> wrote:
>> Use vmalloc() and memset() instead of kcalloc() to allocate a page* array
>>  when the array size is bigger than one page. This enables relayfs to support
>>  bigger relay buffers than 64MB on 4k-page system, 512MB on 16k-page system.
>>
>>  Signed-off-by: Masami Hiramatsu <mhiramat@...hat.com>
>>  ---
>>  @@ -130,7 +138,10 @@ static void *relay_alloc_buf(struct rcha
>>   depopulate:
>>         for (j = 0; j < i; j++)
>>                 __free_page(buf->page_array[j]);
>>  -       kfree(buf->page_array);
>>  +       if (pa_size > PAGE_SIZE)
> 
> You can use is_vmalloc_addr() here.

Thank you for your good advice!
I'll use that.

> 
>>  +               vfree(buf->page_array);
>>  +       else
>>  +               kfree(buf->page_array);
>>         return NULL;
>>   }
>>

-- 
Masami Hiramatsu

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

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

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