linux-kernel - Re: [PATCH -v7 0/35] tip related: not use bootmem for x86

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Date:	Sun, 14 Feb 2010 20:50:33 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH -v7 0/35] tip related: not use  bootmem for x86

On 02/14/2010 06:27 PM, Benjamin Herrenschmidt wrote:
> On Wed, 2010-02-10 at 01:20 -0800, Yinghai Lu wrote:
>>
>> The reserve_early() method is list/range based and can handle vast
>> amounts of not very fragmented memory - perfect for basically all the
>> real bootmem purposes (which is to bootstrap the buddy).
>>
>> reserve_early() allocated memory could be freed into the buddy later
>> on
>> as well. The main reason why bootmem is 'destroyed' during
>> free-to-buddy
>> is because it has excessive internal bitmaps we want to free. With a
>> list/range based reserve_early() mechanism there's no such problem -
>> they can linger indefinitely and there's near zero allocation
>> management
>> overhead. " 
> 
> Various archs use lib/lmb.c for representing physical memory and
> doing early allocations. Might be something to extend ?

yes, could merge them later.

lmb: include memory range array, and reserved range array, and will be used till bootmem_init

early_res: is only reserved range array..., and need to be use with e820 map...
and now early_res is used to replace bootmem...

will check to make e820 to be fw_memmap and move it /kernel/fw_memmap.c

Thanks

Yinghai
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