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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Date:	Thu, 5 Jun 2008 12:03:53 -0400
From:	"Thomas Tuttle" <ttuttle@...gle.com>
To:	"Matt Mackall" <mpm@...enic.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, Jun 5, 2008 at 12:01 PM, Matt Mackall <mpm@...enic.com> wrote:
>
> 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.

Oh.  Sorry about that.  (It's been a while since I sent patches to LKML.)

--ttuttle
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