linux-kernel - Re: [PATCH] mips/mm: Add page soft dirty tracking

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Message-ID: <20200426165441.GA10053@alpha.franken.de>
Date:   Sun, 26 Apr 2020 18:54:42 +0200
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Guoyun Sun <sunguoyun@...ngson.cn>
Cc:     Paul Burton <paulburton@...nel.org>,
        Daniel Silsby <dansilsby@...il.com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Paul Cercueil <paul@...pouillou.net>,
        Dmitry Korotin <dkorotin@...ecomp.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Steven Price <steven.price@....com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        TieZhu Yang <yangtiezhu@...ngson.cn>,
        Xuefeng Li <lixuefeng@...ngson.cn>
Subject: Re: [PATCH] mips/mm: Add page soft dirty tracking

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@...ngson.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.

Thomas.

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