linux-kernel - Re: [PATCH -mm] relayfs: support larger relay buffer take 3

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Date:	Wed, 16 Apr 2008 23:05:28 -0500
From:	Tom Zanussi <tzanussi@...il.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Pekka J Enberg <penberg@...helsinki.fi>,
	David Wilder <dwilder@...ibm.com>,
	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 take 3


On Wed, 2008-04-16 at 15:51 -0400, Masami Hiramatsu 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>
> ---
> Changes from take2 to take3:
>  - Use struct page ** instead of struct page *.
>  - move functions to the place before relay_mmap_buf.
>  - add comments.
> 
> This is useful for a 64-bit system which has a plenty of memory (tens of
> giga bytes) and a large kernel memory space.
> 
> I tested it on x86-64 and ia64.
> 

Hi,

Looks fine to me.

Reviewed-by: Tom Zanussi <tzanussi@...il.com>



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