linux-kernel - Re: [PATCH] Debugging: Keep track of page owners

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Message-Id: <20121207144428.98b3eaf4.akpm@linux-foundation.org>
Date:	Fri, 7 Dec 2012 14:44:28 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Mel Gorman <mgorman@...e.de>
Subject: Re: [PATCH] Debugging: Keep track of page owners

On Fri, 07 Dec 2012 14:37:27 -0800
Dave Hansen <dave@...ux.vnet.ibm.com> wrote:

> On 12/07/2012 02:26 PM, Andrew Morton wrote:\
> > I have cunningly divined the intention of your update and have queued
> > the below incremental.  The change to
> > pagetypeinfo_showmixedcount_print() was a surprise.  What's that there
> > for?
> 
> Do you mean to ask why it's being modified at all here in this patch?
> It's referenced in the changelog a bit.  I believe it came from Mel at
> some point.  I didn't do much to that portion, but I happily drug those
> hunks along with my forward port.  I believe it's virtually all the same
> as what you posted here:
> 
> 	https://bugzilla.kernel.org/show_bug.cgi?id=50181

I'm now deeply confused.

Two days ago I merged a version which you sent me.  It is presently at
http://ozlabs.org/~akpm/mmotm/broken-out/debugging-keep-track-of-page-owners.patch.

Today you sent a new version.  My earlier email showed the difference
between these two versions.

AFACIT that difference was undescribed.  I can see that the new version
uses the stack-tracing infrastructure, but the change to
pagetypeinfo_showmixedcount_print() is a mystery.

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