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

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Message-ID: <51C9E47B.3020302@sgi.com>
Date:	Tue, 25 Jun 2013 11:42:03 -0700
From:	Mike Travis <travis@....com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Greg KH <gregkh@...uxfoundation.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 6/25/2013 11:38 AM, Yinghai Lu wrote:
> On Tue, Jun 25, 2013 at 10:35 AM, Mike Travis <travis@....com> wrote:
>>
>>
>> On 6/21/2013 5:23 PM, Yinghai Lu wrote:
>>> On Fri, Jun 21, 2013 at 2:30 PM, Mike Travis <travis@....com> wrote:
>>>> Exactly.  That's why I left both low and high memory on each node.
>>>
>>> looks like you assume every node have same ram, and before booting you
>>> you need to know memory layout to append the boot command line.
>>>
>>> We have patchset that moving srat table parse early.
>>> git://git.kernel.org/pub/scm/linux/kernel/git/yinghai/linux-yinghai.git
>>> for-x86-mm
>>> https://git.kernel.org/cgit/linux/kernel/git/yinghai/linux-yinghai.git/log/?h=for-x86-mm
>>>
>>> on top that, we could make your patch pass more simple command like
>>> 1/2^n of every node, and only need to pass n instead.
>>
>> The two params that I couldn't figure out how to provide except via kernel
>> param option was the memory block size (128M or 2G) and the physical
>> address space per node.  The other 3 params can be automatically
>> setup by a script when the total system size is known.  As soon as we
>> verify on the 32TB system and surmise what will be needed for 64TB,
>> then those 3 params can probably disappear.
> 
> our "numa parsing early" patchset could provide "physical address
> space per node",
> also can calculate memory block size via alignment detection from numa info.

Thanks!  I'll try it out.
> 
> with that, user only can pass "delay_init_mem" only.
> 
> Thanks
> 
> Yinghai
> 
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