Messages in this thread | | | Date | Sun, 31 Dec 2006 17:02:28 +1100 | From | Nick Piggin <> | Subject | Re: Page alignment issue |
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Aubrey wrote: > As for the buddy system, much of docs mention the physical address of > the first page frame of a block should be a multiple of the group > size. For example, the initial address of a 16-page-frame block should > be 16-page aligned. I happened to encounted an issue that the physical > addresss pf the block is not 4-page aligned(0x36c9000) while the order > of the block is 2. I want to know what out of buddy algorithm depend > on this feature?
I think that's correct. The buddy allocator uses bitwise operations to find buddy pages and promote free pairs (eg. see __page_find_buddy() and __find_combined_index()).
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