linux-kernel - Re: [PATCH 3/4] Staging: zram: allow partial page operations

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Message-ID: <4E1E61AD.4000707@vflare.org>
Date:	Wed, 13 Jul 2011 20:25:33 -0700
From:	Nitin Gupta <ngupta@...are.org>
To:	Jerome Marchand <jmarchan@...hat.com>
CC:	Greg Kroah-Hartman <gregkh@...e.de>,
	Linux Kernel List <linux-kernel@...r.kernel.org>,
	Robert Jennings <rcj@...ux.vnet.ibm.com>,
	Jeff Moyer <jmoyer@...hat.com>
Subject: Re: [PATCH 3/4] Staging: zram: allow partial page operations

On 06/10/2011 06:28 AM, Jerome Marchand wrote:
> Commit 7b19b8d45b216ff3186f066b31937bdbde066f08 (zram: Prevent overflow
> in logical block size) introduced ZRAM_LOGICAL_BLOCK_SIZE constant to
> prevent overflow of logical block size on 64k page kernel.
> However, the current implementation of zram only allow operation on block
> of the same size as a page. That makes theorically legit 4k requests fail
> on 64k page kernel.
>
> This patch makes zram allow operation on partial pages. Basically, it
> means we still do operations on full pages internally, but only copy the
> relevent segments from/to the user memory.
>
> Signed-off-by: Jerome Marchand<jmarchan@...hat.com>

Acked-by: Nitin Gupta <ngupta@...are.org>


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