Messages in this thread | | | Date | Mon, 21 Aug 2006 13:44:09 +0400 | From | Kirill Korotaev <> | Subject | Re: [ckrm-tech] [RFC][PATCH 5/7] UBC: kernel memory accounting (core) |
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Alan Cox wrote: > Ar Gwe, 2006-08-18 am 12:32 -0700, ysgrifennodd Dave Hansen: > >>>It ought to be cheap. Given each set of page structs is an array its a >>>simple subtract and divide (or with care and people try to pack them >>>nicely for cache lines - shift) to get to the parallel accounting array. >> >>I wish page structs were just a simple array. ;) > > > Note I very carefully said "each set of" > > >>It will just be a bit more code, but we'll need this for the two other >>memory models: sparsemem and discontigmem. For discontig, we'll just >>need pointers in the pg_data_ts and, for sparsemem, we'll likely need >>another pointer in the 'struct mem_section'. > > > Actually I don't believe this is true in either case. Change the code > which allocates the page arrays to allocate (+ sizeof(void *) * > pages_in_array on the end of each array when using UBC. The rest then > seems to come out naturally. I only doubt what gain we will have in this situation. boot-time selectable vs. CONFIG-selectable?
Kirill
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