linux-kernel - Re: [patch 1/3 take2] smaps: extract pte walker from smaps code

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Message-ID: <20070209161549.GO16722@waste.org>
Date:	Fri, 9 Feb 2007 10:15:49 -0600
From:	Matt Mackall <mpm@...enic.com>
To:	Christoph Lameter <clameter@....com>
Cc:	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...l.org>, Hugh Dickins <hugh@...itas.com>,
	Paul Mundt <lethal@...ux-sh.org>, linux-kernel@...r.kernel.org
Subject: Re: [patch 1/3 take2] smaps: extract pte walker from smaps code

On Wed, Feb 07, 2007 at 12:30:38AM -0800, Christoph Lameter wrote:
> On Tue, 6 Feb 2007, David Rientjes wrote:
> 
> > Extracts the page table entry walker from the smaps-specific code in
> > fs/proc/task_mmu.c.  This will be used later for clearing the reference
> > bits on pages to measure the number of pages accessed over a time period
> > through /proc/pid/smaps.
> 
> Clearing reference bits? Ummm... That is a pretty inaccurate measure since 
> reclaim can remove pages and revert the reference bits. It can never work 
> reliably.
> 
> > The new struct pte_walker includes the struct vm_area_struct of the memory
> > to walk over.  Iteration begins at the start address and completes at the
> > the end address.  A pointer to another data structure may be stored in the
> > private field such as the struct mem_size_stats, which acts as the smaps
> > accumulator.  For each page table entry in the VMA, the func function is
> > called with the corresponding struct pte_walker, the pte_t, and its
> > address.
> 
> Would it be possible to sync up with the people doing the page table 
> interface?

Have a pointer to this?

-- 
Mathematics is the supreme nostalgia of our time.
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