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SubjectRe: [PATCH] mips/mm: Add page soft dirty tracking
Hi Thomas,

Le dim. 26 avril 2020 à 18:54, Thomas Bogendoerfer
<tsbogend@alpha.franken.de> a écrit :
> On Tue, Apr 21, 2020 at 05:15:27PM +0800, Guoyun Sun wrote:
>> User space checkpoint and restart tool (CRIU) needs the page's
>> change
>> to be soft tracked. This allows to do a pre checkpoint and then dump
>> only touched pages.
>>
>> Signed-off-by: Guoyun Sun <sunguoyun@loongson.cn>
>> ---
>> arch/mips/Kconfig | 1 +
>> arch/mips/include/asm/pgtable-bits.h | 8 ++++--
>> arch/mips/include/asm/pgtable.h | 48
>> ++++++++++++++++++++++++++++++++++--
>
> this breaks all 32bit builds where CPU support RIXI, because it
> overflows
> pgtable_bits.

I think we'd need to make PTEs 64-bit at some point.

We wanted to add support for huge-pages on 32-bit MIPS and faced the
same issue.

-Paul

> Thomas.
>
> --
> Crap can work. Given enough thrust pigs will fly, but it's not
> necessarily a
> good idea. [ RFC1925,
> 2.3 ]


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