From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <4244D068.3080900@osdl.org> Date: Fri, 25 Mar 2005 19:00:56 -0800 From: "Randy.Dunlap" MIME-Version: 1.0 Subject: Re: [RFC][PATCH 1/4] create mm/Kconfig for arch-independent memory options References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Dave Hansen Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, apw@shadowen.org List-ID: Dave Hansen wrote: > With sparsemem and memory hotplug there are quite a few options that > we kept adding identically in several different architectures. This > new file allows some of these to be consolidated. > > Signed-off-by: Andy Whitcroft > Signed-off-by: Dave Hansen > --- > > memhotplug-dave/mm/Kconfig | 41 +++++++++++++++++++++++++++++++++++++++++ > 1 files changed, 41 insertions(+) > > diff -puN mm/Kconfig~A6-mm-Kconfig mm/Kconfig > --- memhotplug/mm/Kconfig~A6-mm-Kconfig 2005-03-25 08:08:22.000000000 -0800 > +++ memhotplug-dave/mm/Kconfig 2005-03-25 08:08:22.000000000 -0800 > @@ -0,0 +1,41 @@ > +choice > + prompt "Memory model" > + default FLATMEM > + default SPARSEMEM if ARCH_SPARSEMEM_DEFAULT > + default DISCONTIGMEM if ARCH_DISCONTIGMEM_DEFAULT > + > +config FLATMEM > + bool "Flat Memory" > + depends on !ARCH_DISCONTIGMEM_ENABLE || ARCH_FLATMEM_ENABLE > + help > + This option allows you to change some of the ways that > + Linux manages its memory internally. Most users will > + only have one option here: FLATMEM. This is normal > + and a correct option. > + > + Some users of more advanced features like NUMA and > + memory hotplug may have different options here. > + DISCONTIGMEM is an more mature, better tested system, > + but is incompatible with memory hotplug and may suffer > + decreased performance over SPARSEMEM. If unsure between > + "Sparse Memory" and "Discontiguous Memory", choose Where is the "Sparse Memory" option? I didn't find it. > + "Discontiguous Memory". > + > + If unsure, choose FLATMEM. > + > +config DISCONTIGMEM > + bool "Discontigious Memory" > + depends on ARCH_DISCONTIGMEM_ENABLE > + help > + If unsure, choose this option over "Sparse Memory". Same question.... > +endchoice > + > +# > +# Both the NUMA code and DISCONTIGMEM use arrays of pg_data_t's > +# to represent different areas of memory. This variable allows > +# those dependencies to exist individually. > +# > +config NEED_MULTIPLE_NODES > + def_bool y > + depends on DISCONTIGMEM || NUMA -- ~Randy -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: aart@kvack.org