linux-kernel - Re: [Patch V3 9/9] mm, x86: Enable memoryless node support to better support CPU/memory hotplug

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Message-ID: <55D316CB.3010509@cn.fujitsu.com>
Date:	Tue, 18 Aug 2015 19:28:11 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	Tejun Heo <tj@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, <x86@...nel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Borislav Petkov <bp@...en8.de>,
	Andy Lutomirski <luto@...capital.net>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"Jan H. Schönherr" 
	<jschoenh@...zon.de>, Igor Mammedov <imammedo@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Xishi Qiu <qiuxishi@...wei.com>,
	Luiz Capitulino <lcapitulino@...hat.com>,
	Dave Young <dyoung@...hat.com>
CC:	Tony Luck <tony.luck@...el.com>, <linux-mm@...ck.org>,
	<linux-hotplug@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>, <linux-pm@...r.kernel.org>,
	<tangchen@...fujitsu.com>
Subject: Re: [Patch V3 9/9] mm, x86: Enable memoryless node support to better
 support CPU/memory hotplug


On 08/18/2015 02:59 PM, Jiang Liu wrote:
>
> ...
>>>        }
>>> @@ -739,6 +746,22 @@ void __init init_cpu_to_node(void)
>>>            if (!node_online(node))
>>>                node = find_near_online_node(node);

Hi Liu,

If cpu-less, memory-less and normal node will all be online anyway,
I think we don't need to find_near_online_node() any more for
CPUs on offline nodes.

Or is there any other case ?

Thanks.


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