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

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Message-ID: <20130905111510.GC23362@gmail.com>
Date:	Thu, 5 Sep 2013 13:15:10 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Alex Thorlton <athorlton@....com>
Cc:	Robin Holt <robinmholt@...il.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	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>
Subject: Re: [PATCH 1/8] THP: Use real address for NUMA policy


* Alex Thorlton <athorlton@....com> wrote:

> > Robin,
> > 
> > I tweaked one of our other tests to behave pretty much exactly as I
> > - malloc a large array
> > - Spawn a specified number of threads
> > - Have each thread touch small, evenly spaced chunks of the array (e.g.
> >   for 128 threads, the array is divided into 128 chunks, and each thread
> >   touches 1/128th of each chunk, dividing the array into 16,384 pieces)
> 
> Forgot to mention that the threads don't touch their chunks of memory
> concurrently, i.e. thread 2 has to wait for thread 1 to finish first.
> This is important to note, since the pages won't all get stuck on the
> first node without this behavior.

Could you post the testcase please?

Thanks,

	Ingo
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