linux-kernel - Re: [PATCH 0/5] mm,debug: VM framework to capture memory reference pattern

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Message-ID: <20110706093146.GB19518@in.ibm.com>
Date:	Wed, 6 Jul 2011 15:01:46 +0530
From:	Ankita Garg <ankita@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-mm@...ck.org, svaidy@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org, Matt Mackall <mpm@...enic.com>
Subject: Re: [PATCH 0/5] mm,debug: VM framework to capture memory reference
 pattern

Hi,

On Wed, Jul 06, 2011 at 02:01:03AM -0700, Andrew Morton wrote:
> On Tue,  5 Jul 2011 13:52:34 +0530 Ankita Garg <ankita@...ibm.com> wrote:
> 
> > 
> > This patch series is an instrumentation/debug infrastructure that captures
> > the memory reference pattern of applications (workloads). 
> 
> Can't the interfaces described in Documentation/vm/pagemap.txt be used
> for this?

The pagemap interface does not closely track the hardware reference bit
of the pages. The 'REFERENCED' flag maintained in /proc/kpageflags
only indicates if the page has been referenced since last LRU list
enqueue/requeue. So estimating the rate at which a particular page of
memory is referenced cannot be obtained. Further, it does not provide
information on the amount of kernel memory referenced on behalf of
the process.

-- 
Regards,
Ankita Garg (ankita@...ibm.com)
Linux Technology Center
IBM India Systems & Technology Labs,
Bangalore, India
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