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SubjectRe: [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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