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== Math model ==
As described in the [[User pagesaccounting|article about user pages]], this algorithm calculates the “fractions” of pages that are mapped to beancounter, in a tricky manner.
Naturally, if a page is shared between <math>N</math> beancounters, each UB must get <math>\frac {1} {N}</math>-th part of it. This approach would be the most precise, but also the worst, as adding a page to a new beancounter would require an update on all the beancounters between which the page is already shared.