linux-kernel - Re: [RFC 0/3] Mirrored memory support for boot time allocations

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Message-ID: <55599BAA.20204@huawei.com>
Date:	Mon, 18 May 2015 15:58:34 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	Tony Luck <tony.luck@...el.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	<linux-kernel@...r.kernel.org>, <linux-mm@...r.kernel.org>,
	Xiexiuqi <xiexiuqi@...wei.com>
Subject: Re: [RFC 0/3] Mirrored memory support for boot time allocations

On 2015/2/7 5:54, Tony Luck wrote:

> Platforms that support a mix of mirrored and regular memory are coming.
> 
> We'd like to use the mirrored memory for kernel code, data and dynamically
> allocated data because our machine check recovery code cannot fix problems
> there.  This series modifies the memblock allocator to comprehend mirrored
> memory and use it for all boot time allocations.  Later I'll dig into page_alloc.c
> to put the leftover mirrored memory into a zone to be used for kernel allocation
> by slab/slob/slub and others.

Hi Tony,

Is it means that you will create a new zone to fill mirrored memory, like the
movable zone, right? 
I think this will change a lot of code, why not create a new migrate type?
such as CMA, e.g. MIGRATE_MIRROR

Thanks,
Xishi Qiu

> 
> You'll see why this is just RFC when you get to part 3.
> 
> Tony Luck (3):
>   mm/memblock: Add extra "flag" to memblock to allow selection of memory
>     based on attribute
>   mm/memblock: Allocate boot time data structures from mirrored memory
>   x86, mirror: x86 enabling - find mirrored memory ranges and tell
>     memblock
> 
>  arch/s390/kernel/crash_dump.c |   4 +-
>  arch/sparc/mm/init_64.c       |   4 +-
>  arch/x86/kernel/check.c       |   2 +-
>  arch/x86/kernel/e820.c        |   2 +-
>  arch/x86/mm/init_32.c         |   2 +-
>  arch/x86/mm/memtest.c         |   2 +-
>  include/linux/memblock.h      |  43 ++++++++++------
>  mm/cma.c                      |   4 +-
>  mm/memblock.c                 | 113 ++++++++++++++++++++++++++++++++----------
>  mm/nobootmem.c                |  12 ++++-
>  10 files changed, 135 insertions(+), 53 deletions(-)
> 



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