linux-kernel - Re: [PATCH 2/2] x86: mtrr_cleanup try gran

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Date:	Fri, 03 Oct 2008 00:38:36 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	"J.A. Magallón" <jamagallon@....com>,
	Linux-Kernel <linux-kernel@...r.kernel.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 2/2] x86: mtrr_cleanup try gran_size to less than 1M

Ingo Molnar wrote:
> * J.A. Magallón <jamagallon@....com> wrote:
> 
>> Also, on a 64 bit box with 4Gb, it gives this:
>>
>> cicely:~# cat /proc/mtrr
>> reg00: base=0x00000000 (   0MB), size=4096MB: write-back, count=1
>> reg01: base=0x100000000 (4096MB), size=1024MB: write-back, count=1
>> reg02: base=0x140000000 (5120MB), size= 512MB: write-back, count=1
>> reg03: base=0x160000000 (5632MB), size= 256MB: write-back, count=1
>> reg04: base=0x80000000 (2048MB), size=2048MB: uncachable, count=1
>>
>> Patch below cleans up formatting, with space for big bases and sizes (64 Gb).
> 
> applied to tip/x86/mtrr, thanks!
> 
>> +++ arch/x86/kernel/cpu/mtrr/if.c     2008-10-03 00:22:34.000000000 +0200
>> @@ -16,7 +16,7 @@
>>  static const char *const mtrr_strings[MTRR_NUM_TYPES] =
>>  {
>>      "uncachable",               /* 0 */
>> -    "write-combining",          /* 1 */
>> +    "write-combine",            /* 1 */
> 
> hm, maybe this bit could confuse versions of Xorg that modifies 
> /proc/mtrr - i.e. this could be part of the ABI towards user-space. 
> We'll see.
> 

This *IS* part of the ABI toward userspace, although I think Xorg uses 
the ioctl() interface.

	-hpa
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