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

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Message-Id: <1212681667.3953.159.camel@calx>
Date:	Thu, 05 Jun 2008 11:01:07 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Thomas Tuttle <ttuttle@...gle.com>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] pagemap: Change kpagecount to return the map
	count, not the reference count, of a page.


On Thu, 2008-06-05 at 11:04 -0400, Thomas Tuttle wrote:
> 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.

I'm pretty sure this has been suggested before and I was just too
thick-skulled to get it. Yes, the reference count is less useful.

Acked-by: Matt Mackall <mpm@...enic.com>

ps: It's much prefered to send patches inline.

-- 
Mathematics is the supreme nostalgia of our time.

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