linux-kernel - [PATCH 2/5] pagemap: Change kpagecount to return the map count, not the reference count, of a page.

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Message-ID: <4ca0a85e0806050804s798bba46wcb29d2582120bfab@mail.gmail.com>
Date:	Thu, 5 Jun 2008 11:04:33 -0400
From:	"Thomas Tuttle" <ttuttle@...gle.com>
To:	mpm@...enic.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/5] pagemap: Change kpagecount to return the map count, not the reference count, of a page.

When trying to use pagemap to calculate the "proportional set size"
[1] of a process, I discovered that there were often references to
pages that could not be discovered by kpagecount.  I changed
kpagecount to return the number of times a page is mapped, rather than
referenced, so kpagecount is more useful for determining how many
processes are using a page.

[1] PSS is the amount of memory used by a process, weighted by 1 / the
number of processes sharing the memory -- so a 128K library shared by
2 processes counts as 64K PSS for each of them.

View attachment "0002-Changed-kpagecount-to-return-the-map-count-not-the.patch" of type "text/x-patch" (885 bytes)