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

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Message-ID: <alpine.DEB.2.00.1203191536390.23632@router.home>
Date:	Mon, 19 Mar 2012 15:43:09 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Ingo Molnar <mingo@...nel.org>
cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	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, 19 Mar 2012, Ingo Molnar wrote:

> > I wonder how we can verify that the automatic migration
> > schemes are a real benefit to the application? We have a
> > history of developing a kernel that decreases in performance
> > as development proceeds. How can we make sure that these
> > schemes are actually beneficial overall for all loads and do
> > not cause regressions elsewhere? [...]
>
> The usual way?

Which is merge after a couple of benchmarks and then deal with the
regressions for a couple of years?

Patch verification occurs in an artificial bubble of software run/known by
kernel developers. It can take years before the code is exposed to
real life situations.
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