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Message-ID: <86802c440804281547mf258345mbb7a3e8c3c0fa2f5@mail.gmail.com>
Date: Mon, 28 Apr 2008 15:47:59 -0700
From: "Yinghai Lu" <yhlu.kernel@gmail.com>
To: "Randy Dunlap" <randy.dunlap@oracle.com>
Subject: Re: [PATCH] x86: mtrr cleanup for converting continuous to discrete layout v5
Cc: "Yinghai Lu" <yhlu.kernel.send@gmail.com>,
       "Andrew Morton" <akpm@linux-foundation.org>,
       "Ingo Molnar" <mingo@elte.hu>, "H. Peter Anvin" <hpa@zytor.com>,
       "Thomas Gleixner" <tglx@linutronix.de>,
       "Gabriel C" <nix.or.die@googlemail.com>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
       "Mika Fischer" <mika.fischer@zoopnet.de>
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References: <200804272337.40130.yhlu.kernel@gmail.com>
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On Mon, Apr 28, 2008 at 3:36 PM, Randy Dunlap <randy.dunlap@oracle.com> wrote:
> On Mon, 28 Apr 2008 15:05:05 -0700 Yinghai Lu wrote:
>
>  > Index: linux-2.6/Documentation/kernel-parameters.txt
>  > ===================================================================
>  > --- linux-2.6.orig/Documentation/kernel-parameters.txt
>  > +++ linux-2.6/Documentation/kernel-parameters.txt
>  > @@ -595,6 +595,16 @@ and is between 256 and 4096 characters.
>  >                       See drivers/char/README.epca and
>  >                       Documentation/digiepca.txt.
>  >
>  > +     disable_mtrr_cleanup [X86]
>  > +     enable_mtrr_cleanup [X86]
>  > +                     The kernel try to adjust MTRR layout from continuous
>
>                                    tries
>
>
>  > +                     to discrete, to make x server driver could add WB entry
>
>                                              X server driver able to add WB entry
>
>
>  > +                     later. This parameter enable/disable that.
>
>                                               enables/disables
>
>
>  > +
>  > +     mtrr_chunk_size=nn[KMG] [X86]
>  > +                     used for mtrr cleanup. It is largest continous chunk
>  > +                     that could hold holes aka. UC entries.
>  > +
>  >       disable_mtrr_trim [X86, Intel and AMD only]
>  >                       By default the kernel will trim any uncacheable
>  >                       memory out of your available memory pool based on
>  > Index: linux-2.6/arch/x86/Kconfig
>  > ===================================================================
>  > --- linux-2.6.orig/arch/x86/Kconfig
>  > +++ linux-2.6/arch/x86/Kconfig
>  > @@ -1035,6 +1035,32 @@ config MTRR
>  >
>  >         See <file:Documentation/mtrr.txt> for more information.
>  >
>  > +config MTRR_SANITIZER
>  > +     def_bool y
>  > +     prompt "MTRR cleanup support"
>  > +     depends on MTRR
>  > +     help
>  > +       Convert MTRR layout from continuous to discrete, so some X driver
>  > +       could add WB entries.
>  > +
>  > +       Say N here if you see bootup problems (boot crash, boot hang,
>  > +       spontaneous reboots).
>  > +
>  > +       could be disabled with disable_mtrr_cleanup. also mtrr_chunk_size
>
>           Could                                        Also
>
>
>  > +       could be used to send largest mtrr entry size for continuous block
>  > +       to hold holes (aka. UC entries)
>  > +
>  > +       If unsure, say Y.
>  > +
>  > +config MTRR_SANITIZER_ENABLE_DEFAULT
>  > +     bool
>  > +     prompt "MTRR cleanup enable default"
>
>         prompt "Enable MTRR cleanup"
>  or
>         prompt "Enable MTRR cleanup by default"
>
>
>  > +     depends on MTRR_SANITIZER
>  > +     help
>  > +       Enable mtrr cleanup by default
>
>                                  default.
>
>  > +
>  > +       If unsure, say Y.
>  > +
>  >  config X86_PAT
>  >       bool
>  >       prompt "x86 PAT support"

thanks.

YH