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

---
~Randy

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