linux-kernel - Re: [PATCH 1/8] THP: Use real address for NUMA policy

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Message-ID: <20130816181728.GQ26093@sgi.com>
Date:	Fri, 16 Aug 2013 13:17:28 -0500
From:	Alex Thorlton <athorlton@....com>
To:	Dave Hansen <dave.hansen@...el.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	"Eric W . Biederman" <ebiederm@...ssion.com>,
	Sedat Dilek <sedat.dilek@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Dave Jones <davej@...hat.com>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
	David Howells <dhowells@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Al Viro <viro@...iv.linux.org.uk>,
	Oleg Nesterov <oleg@...hat.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Kees Cook <keescook@...omium.org>, Robin Holt <holt@....com>
Subject: Re: [PATCH 1/8] THP: Use real address for NUMA policy

> Could you add some actual descriptions to these patches that say why you
> are doing this, and why this particular patch is needed and implemented
> this way?
> 
> You mention that THP is slow for you, then go on to implement some
> non-cached page zero'ing, but you never quite connect the dots.

I actually didn't write these patches (made a few tweaks to get them
running on the latest kernel though).  They were submitted last July by 
Peter Zijlstra.  Andi Kleen suggested that I re-run some of my tests
using these patches to see whether they solved my issue.  I just
included my updated patches so that people could confirm that I'd pulled
them forward properly.

The messages from the original submission can be found here:
https://lkml.org/lkml/2012/7/20/165

I did write the patch that these were submitted in response to, to
control THP on a per-process basis, but it looks like we're probably
going to end up taking this in a different direction, pending some more
test results.

- Alex
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