Can a memory page be moved by modifying the page table?

Posted by Adam on Stack Overflow See other posts from Stack Overflow or by Adam
Published on 2010-04-20T22:13:17Z Indexed on 2010/04/20 22:53 UTC
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page

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swap

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tlb

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copy

Is it possible (on any reasonable OS, preferably Linux) to swap the contents of two memory pages by only modifying the page table and not actually moving any data?

The motivation is a dense matrix transpose. If the data were blocked by page size it would be possible to transpose the data within a page (fits in cache) then swap pages to move the blocks into their final place. A large matrix would have many many pages moved, so hopefully flushing the TLB wouldn't cause trouble.

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