linux-kernel - Re: [PATCH v9 0/7] Make cpuid <-> nodeid mapping persistent

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Message-ID: <20160726010344.GO19588@mtj.duckdns.org>
Date:	Mon, 25 Jul 2016 21:03:44 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Dou Liyang <douly.fnst@...fujitsu.com>, cl@...ux.com,
	mika.j.penttila@...il.com, mingo@...hat.com, rjw@...ysocki.net,
	hpa@...or.com, yasu.isimatu@...il.com,
	isimatu.yasuaki@...fujitsu.com, kamezawa.hiroyu@...fujitsu.com,
	izumi.taku@...fujitsu.com, gongzhaogang@...pur.com,
	len.brown@...el.com, lenb@...nel.org, tglx@...utronix.de,
	chen.tang@...ystack.cn, rafael@...nel.org, x86@...nel.org,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH v9 0/7] Make cpuid <-> nodeid mapping persistent

Hello,

On Mon, Jul 25, 2016 at 05:25:49PM -0700, Andrew Morton wrote:
> > Yeah, that was one of the early approaches.  The issue isn't limited
> > to wq.  Any memory allocation can have similar issues of underlying
> > node association changing and we don't have any synchronization
> > mechanism around it.  It doesn't make any sense to make NUMA
> > association dynamic when the consumer surface is vastly larger and
> > there's nothing inherently dynamic about the association itself.
> 
> And other architectures?

No idea but it only matters for NUMA + CPU hotplug combination where a
whole node can go empty, which would at most be a few archs.

Thanks.

-- 
tejun