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Date: Mon, 19 Mar 2012 15:34:42 +0100 From: Andrea Arcangeli <aarcange@...hat.com> To: Peter Zijlstra <a.p.zijlstra@...llo.nl> Cc: Avi Kivity <avi@...hat.com>, 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>, 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, Mar 19, 2012 at 03:07:59PM +0100, Peter Zijlstra wrote: > And no, I really don't think giving up 0.5% of RAM is acceptable. Fine it's up to you :). Also note 16 bytes of those 24 bytes, you need to spend them too if you remotely hope to perform as good as AutoNUMA (I can already tell you...), they've absolutely nothing to do with the background scanning that AutoNUMA does to avoid modifying the apps. The blame on autonuma you can give is 8 bytes per page only, so 0.07%, which I can probably reduce 0.03% if I screw the natural alignment of the list pointers and MAX_NUMNODES is < 32768 at build time, not sure if it's worth it. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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