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

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Date:	Wed, 16 Apr 2008 11:33:01 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Masami Hiramatsu" <mhiramat@...hat.com>
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

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.

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