From mboxrd@z Thu Jan 1 00:00:00 1970 From: m.nazarewicz@samsung.com (=?utf-8?B?TWljaGHFgiBOYXphcmV3aWN6?=) Date: Thu, 26 Aug 2010 04:12:10 +0200 Subject: [PATCH/RFCv4 0/6] The Contiguous Memory Allocator framework In-Reply-To: <20100826095857.5b821d7f.kamezawa.hiroyu@jp.fujitsu.com> References: <1282310110.2605.976.camel@laptop> <20100825155814.25c783c7.akpm@linux-foundation.org> <20100826095857.5b821d7f.kamezawa.hiroyu@jp.fujitsu.com> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Thu, 26 Aug 2010 02:58:57 +0200, KAMEZAWA Hiroyuki 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, Micha? "mina86" Nazarewicz (o o) +----[mina86*mina86.com]---[mina86*jabber.org]----ooO--(_)--Ooo--