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

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Message-ID: <20130816185212.GA3568@shutemov.name>
Date:	Fri, 16 Aug 2013 21:52:12 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Alex Thorlton <athorlton@....com>
Cc:	Dave Hansen <dave.hansen@...el.com>, 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

On Fri, Aug 16, 2013 at 01:17:28PM -0500, Alex Thorlton wrote:
> > 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

Here's more up-to-date version: https://lkml.org/lkml/2012/8/20/337

-- 
 Kirill A. Shutemov
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