linux-kernel - RE: [PATCH v2 1/4] introduce zero filled pages handler

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Message-ID: <6041f181-67b1-4f71-bd5c-cfb48f1ddfb0@default>
Date:	Sat, 16 Mar 2013 11:24:20 -0700 (PDT)
From:	Dan Magenheimer <dan.magenheimer@...cle.com>
To:	Konrad Rzeszutek Wilk <konrad@...nok.org>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Minchan Kim <minchan@...nel.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: RE: [PATCH v2 1/4] introduce zero filled pages handler

> From: Konrad Rzeszutek Wilk [mailto:konrad@...nok.org]
> Subject: Re: [PATCH v2 1/4] introduce zero filled pages handler
> 
> > +
> > +	for (pos = 0; pos < PAGE_SIZE / sizeof(*page); pos++) {
> > +		if (page[pos])
> > +			return false;
> 
> Perhaps allocate a static page filled with zeros and just do memcmp?

That seems like a bad idea.  Why compare two different
memory locations when comparing one memory location
to a register will do?

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