Re: [PATCH/RFCv4 0/6] The Contiguous Memory Allocator framework

[MichaÅ Nazarewicz]

On Thu, 26 Aug 2010 02:58:57 +0200, KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote:
> Hmm, you may not like this..but how about following kind of interface ?
>
> Now, memoyr hotplug supports following operation to free and _isolate_
> memory region.
> 	# echo offline > /sys/devices/system/memory/memoryX/state
>
> Then, a region of memory will be isolated. (This succeeds if there are free
> memory.)
>
> Add a new interface.
>
> 	% echo offline > /sys/devices/system/memory/memoryX/state
> 	# extract memory from System RAM and make them invisible from buddy allocator.
>
> 	% echo cma > /sys/devices/system/memory/memoryX/state
> 	# move invisible memory to cma.

At this point I need to say that I have no experience with hotplug memory but
I think that for this to make sense the regions of memory would have to be
smaller.  Unless I'm misunderstanding something, the above would convert
a region of sizes in order of GiBs to use for CMA.

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