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

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Message-ID: <86802c440803131804w1173b9b5n9d9f2d85c98b8901@mail.gmail.com>
Date:	Thu, 13 Mar 2008 18:04:05 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Johannes Weiner" <hannes@...urebad.de>
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>,
	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH] mm: make reserve_bootmem can crossed the nodes

On Thu, Mar 13, 2008 at 5:13 PM, Johannes Weiner <hannes@...urebad.de> wrote:
> Hi,
>
>  "Yinghai Lu" <yhlu.kernel@...il.com> writes:
>

>  >  static void __init free_bootmem_core(bootmem_data_t *bdata, unsigned long addr,
>  > @@ -407,6 +432,11 @@ unsigned long __init init_bootmem_node(p
>  >  void __init reserve_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
>  >                                unsigned long size, int flags)
>  >  {
>  > +     int ret;
>  > +
>  > +     ret = can_reserve_bootmem_core(pgdat->bdata, physaddr, size, flags);
>  > +     if (ret < 0)
>  > +             return;
>  >       reserve_bootmem_core(pgdat->bdata, physaddr, size, flags);
>
>  I don't get it.  Sorry.  What is the purpose of
>  can_reserve_bootmem_core()?  It does exactly what reserve_bootmem_core
>  does besides actually setting the bits.  All the pre-checking you wanted
>  to have out of the way is repeated again in reserve_bootmem_core()
>  (well, almost all).

can_reserve_bootmem_core is check if there is some pages is reserved
already with
>  > +                     if (flags & BOOTMEM_EXCLUSIVE)
>  > +                             return -EBUSY;

so it will avoid the restoring later.

YH
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