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

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Date:	Mon, 18 May 2015 16:23:23 +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 <linux-mm@...ck.org>,
	Xiexiuqi <xiexiuqi@...wei.com>
Subject: Re: [RFC 0/3] Mirrored memory support for boot time allocations

Add linux-mm@...ck.org

On 2015/5/18 15:58, Xishi Qiu wrote:

> 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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