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

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Date:	Fri, 14 Mar 2008 10:55:29 +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 18:35:51 -0700
"Yinghai Lu" <yhlu.kernel@...il.com> wrote:

> On Thu, Mar 13, 2008 at 6:34 PM, KAMEZAWA Hiroyuki
> <kamezawa.hiroyu@...fujitsu.com> wrote:
> > On Thu, 13 Mar 2008 16:45:42 -0700
> >  "Yinghai Lu" <yhlu.kernel@...il.com> wrote:
> >  > int __init reserve_bootmem(unsigned long addr, unsigned long size,
> >  >                           int flags)
> >  >  {
> >  > -     return reserve_bootmem_core(NODE_DATA(0)->bdata, addr, size, flags);
> >  > +     int ret;
> >  > +     bootmem_data_t *bdata;
> >  > +     list_for_each_entry(bdata, &bdata_list, list) {
> >  > +             ret = can_reserve_bootmem_core(bdata, addr, size, flags);
> >  > +             if (ret < 0)
> >  > +                     return ret;
> >  > +     }
> >  > +     list_for_each_entry(bdata, &bdata_list, list)
> >  > +             reserve_bootmem_core(bdata, addr, size, flags);
> >  > +     return 0;
> >  >  }
> >
> >  why list_for_each twice ?
> 
> first_for_each only check if we can reserve that.
> second will do the reserve job.
> 
Hmm, can a call to reserve_bootmem() return a memory region which spread across
prural nodes ?


Thanks,
-Kame 

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