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SubjectRe: [PATCH] x86: mtrr cleanup for converting continuous to discrete layout v5
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


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