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Message-ID: <3f250c710502240343563c5cb0@mail.gmail.com>
Date: Thu, 24 Feb 2005 07:43:05 -0400
From: Mauricio Lin <mauriciolin@gmail.com>
Reply-To: Mauricio Lin <mauriciolin@gmail.com>
To: Andrew Morton <akpm@osdl.org>
Subject: Re: [PATCH] A new entry for /proc
Cc: hugh@veritas.com, wli@holomorphy.com, linux-kernel@vger.kernel.org,
       rrebel@whenu.com, marcelo.tosatti@cyclades.com,
       Nick Piggin <nickpiggin@yahoo.com.au>
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Hi Andrew,

But can i use jiffies to measure this kind of performance??? AFAIK, if
it is more efficient, then it is faster, right? How can I know how
fast it is? Any idea?

BR,

Mauricio Lin.


On Thu, 24 Feb 2005 01:09:47 -0800, Andrew Morton <akpm@osdl.org> wrote:
> Mauricio Lin <mauriciolin@gmail.com> wrote:
> >
> > You said that the old smaps version is not efficient because the way
> >  it access each pte.
> 
> Nick is talking about changing the kenrel so that it "refcounts pagetable
> pages".  I'm not sure why.
> 
> I assume that this means that each pte page's refcount will be incremented
> by one for each instantiated pte.  If so, then /proc/pid/smaps can become a
> lot more efficient.  Just add up the page refcounts on all the pte pages -
> no need to walk the ptes themselves.
> 
> Maybe?
>
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