linux-kernel - Re: [RFC][PATCH 00/26] sched/numa

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Message-ID: <1332156655.18960.297.camel@twins>
Date:	Mon, 19 Mar 2012 12:30:55 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Avi Kivity <avi@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mike Galbraith <efault@....de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Dan Smith <danms@...ibm.com>,
	Bharata B Rao <bharata.rao@...il.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC][PATCH 00/26] sched/numa

On Mon, 2012-03-19 at 12:12 +0100, Peter Zijlstra wrote:
> Also, if you go scan memory, you need some storage -- see how aa grows
> struct page, sure he wants to move that storage some place else, but the
> memory overhead is still there -- this means less memory to actually do
> useful stuff in (it also probably means more cache-misses since his
> proposed shadow array in pgdat is someplace else). 

Going by the sizes in aa's patch, that's 96M of my 16G box gone. That
puts HPC people in a rather awkward position of having to choose between
more memory and slightly smarter kernel. I'm thinking they're going to
opt for going the way they are now (hard affinity/userspace balancers)
and use the extra memory.

This even though typical MPI implementations use the multi-process
scheme, so the simple home-node approach I used works just fine for
them.
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