linux-kernel - Re: [RFC 0/2] Delay initializing of large sections of memory

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Message-ID: <51C4C5F3.3050800@sgi.com>
Date:	Fri, 21 Jun 2013 14:30:27 -0700
From:	Mike Travis <travis@....com>
To:	Greg KH <gregkh@...uxfoundation.org>
CC:	Yinghai Lu <yinghai@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
	Nathan Zimmer <nzimmer@....com>, Robin Holt <holt@....com>,
	Rob Landley <rob@...dley.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	linux-doc@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 0/2] Delay initializing of large sections of memory



On 6/21/2013 11:50 AM, Greg KH wrote:
> On Fri, Jun 21, 2013 at 11:44:22AM -0700, Yinghai Lu wrote:
>> On Fri, Jun 21, 2013 at 10:03 AM, H. Peter Anvin <hpa@...or.com> wrote:
>>> On 06/21/2013 09:51 AM, Greg KH wrote:
>>>
>>> I suspect the cutoff for this should be a lot lower than 8 TB even, more
>>> like 128 GB or so.  The only concern is to not set the cutoff so low
>>> that we can end up running out of memory or with suboptimal NUMA
>>> placement just because of this.
>>
>> I would suggest another way:
>> only boot the system with boot node (include cpu, ram and pci root buses).
>> then after boot, could add other nodes.
> 
> What exactly do you mean by "after boot"?  Often, the boot process of
> userspace needs those additional cpus and ram in order to initialize
> everything (like the pci devices) properly.

Exactly.  That's why I left both low and high memory on each node.

> 
> thanks,
> 
> greg k-h
> 
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