On Thu, 26 Aug 2010 02:58:57 +0200, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:
quoted text
> 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.

-- 
Best regards,                                        _     _
| Humble Liege of Serenely Enlightened Majesty of  o' \,=./ `o
| Computer Science,  Michał "mina86" Nazarewicz       (o o)
+----[mina86*mina86.com]---[mina86*jabber.org]----ooO--(_)--Ooo--

--
unsubscribe notice
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/