linux-kernel - Re: [PATCH] x86: suggest running a 64bit kernel on LM capable machines with plenty memory.

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Date:	Wed, 11 Mar 2009 13:01:25 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Ozan Çağlayan <ozan@...dus.org.tr>,
	Alexey Dobriyan <adobriyan@...il.com>,
	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] x86: suggest running a 64bit kernel on LM capable
 machines with plenty memory.

On Tue, 2009-03-10 at 06:21 -0700, Arjan van de Ven wrote:
> On Tue, 10 Mar 2009 10:37:08 +0100
> Peter Zijlstra <peterz@...radead.org> wrote:
> > diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
> > index 34ef5c7..e759107 100644
> > --- a/arch/x86/mm/init_32.c
> > +++ b/arch/x86/mm/init_32.c
> > @@ -713,13 +713,19 @@ void __init lowmem_pfn_init(void)
> >  	"only %luMB highmem pages available, ignoring highmem size
> > of %luMB!\n" 
> >  #define MSG_HIGHMEM_TRIMMED \
> > -	"Warning: only 4GB will be used. Use a HIGHMEM64G enabled
> > kernel!\n"
> > +	"Warning: only 4GB will be used. Use a %s kernel!\n"
> > +
> > +#define MSG_LM_TRIMMED \
> > +	"Warning: instead of using a 32bit %s kernel, Use a 64bit
> > kernel!\n" +
> 
> I would like to avoid the prefix "Warning:" for something like this ;-)
> 
> lets keep that prefix for Real Warnings(tm) instead please.

It is a Real warning, its issued when memory gets trimmed because you
run a wrong kernel. The only change is suggesting to run a 64bit kernel
when possible instead of a HIGHMEM/PAE kernel.

Esp on x86_64 machines with >=4G of memory its insane to run i386-PAE.

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