linux-kernel - Re : Re : sparsemem usage

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Message-ID: <20060803090706.99884.qmail@web25813.mail.ukl.yahoo.com>
Date:	Thu, 3 Aug 2006 09:07:06 +0000 (GMT)
From:	moreau francis <francis_moreau2000@...oo.fr>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-kernel@...r.kernel.org, apw@...dowen.org
Subject: Re : Re : sparsemem usage

Alan Cox wrote:
>
> Mapping out parts of a section is quite normal - think about the 640K to
> 1Mb hole in PC memory space.

OK. But I'm still worry. Please consider the following code

       for (...; ...; ...) {
                [...]
                if (pfn_valid(i))
                       num_physpages++;
                [...]
        }

In that case num_physpages won't store an accurate value. Still it will be
used by the kernel to make some statistic assumptions on other kernel
data structure sizes.

Francis
        



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