Messages in this thread | | | Date | Thu, 26 Aug 2010 04:12:10 +0200 | From | Michał Nazarewicz <> | Subject | Re: [PATCH/RFCv4 0/6] The Contiguous Memory Allocator framework |
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On Thu, 26 Aug 2010 02:58:57 +0200, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> 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.
-- 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--
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