linux-kernel - Re: [PATCH 07/39] lmb: Add lmb_find

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Date:	Mon, 12 Apr 2010 21:29:11 -0700
From:	Yinghai <yinghai.lu@...cle.com>
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>,
	David Miller <davem@...emloft.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH 07/39] lmb: Add lmb_find_area()

On 04/12/2010 09:05 PM, Benjamin Herrenschmidt wrote:
> On Thu, 2010-04-08 at 23:03 -0700, Yinghai Lu wrote:
>> It will try find area according with size/align in specified range (start, end).
>>
>> lmb_find_area() will honor goal/limit.
>>
>> also make it more easy for x86 to use lmb.
>> x86 early_res is using find/reserve pattern instead of alloc.
>>
>> When we need temporaray buff for range array etc for range work, if We are using
>> lmb_alloc(), We will need to add some post fix code for buffer that is used
>> by range array, because it is in the lmb.reserved already. and have to call
>> extra lmb_free().
>>
>> -v2: Change name to lmb_find_area() according to Michael Ellerman
>> -v3: Add generic weak version __lmb_find_area()
> 
> Haven't you noticed there's already way too many functions walking the
> LMBs ? :-)

x86 is using original lmb_reserve, lmb_free(), but have own version lmb_find_area(), and it will be dropped after
more testing of generic version of lmb_find_area()

> 
> I think the ones doing nid alloc could/should be also rewritten to use
> one single low level __lmb_find_* no ?

that nid_alloc() only has one user (sparc64).

maybe could be replaced by lmd_find_area_node(), but need to make sure early_node_map[] is filled at first.

Thanks

Yinghai
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