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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
- References:
- [RFC][PATCH] UBC: user resource beancounters
- From: Kirill Korotaev <[email protected]>
- [RFC][PATCH 5/7] UBC: kernel memory accounting (core)
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