linux-kernel - Re: [PATCH] mm: make reserve_bootmem can crossed the nodes

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Message-Id: <20080314113646.d73066f7.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 14 Mar 2008 11:36:46 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"Yinghai Lu" <yhlu.kernel@...il.com>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Ingo Molnar" <mingo@...e.hu>, "Andi Kleen" <ak@...e.de>,
	"Christoph Lameter" <clameter@....com>,
	linux-kernel@...r.kernel.org,
	"Yasunori Goto" <y-goto@...fujitsu.com>
Subject: Re: [PATCH] mm: make reserve_bootmem can crossed the nodes

On Thu, 13 Mar 2008 19:00:33 -0700
"Yinghai Lu" <yhlu.kernel@...il.com> wrote:
> >  Hmm, can a call to reserve_bootmem() return a memory region which spread across
> >  prural nodes ?
> 
> Yes. there is one reserve_bootmem in reserve_crashkernel. and position
> is passed via commandline...
> there is some chance for ramdisk too. it is called via reserve_bootmem_generic.
> 
Hmm, ok. I finally see your point. 

please allow me to make clarification

Background:
- reserve_bootmem is called for *reserve* memory before bootmem allocator.
- It specifies <address, size>.
- Because <addrees, size> are argments, memory hole in <address, size> is not
  problem here.

Before change,
- reseve_bootmem() only works for Node(0)

After change
- reserve_bootmem() works on sutiable nodes for <address, size>
- It can spread accross among prural nodes.

thank you for your work.

Regards,
-Kame

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