Messages in this thread | | | Date | Fri, 19 Nov 2004 17:56:43 -0800 (PST) | From | Linus Torvalds <> | Subject | Re: page fault scalability patch V11 [0/7]: overview |
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On Sat, 20 Nov 2004, Nick Piggin wrote: > > The per thread rss may wrap (maybe not 64-bit counters), but even so, > the summation over all threads should still end up being correct I > think.
Yes. As long as the total rss fits in an int, it doesn't matter if any of them wrap. Addition is still associative in twos-complement arithmetic even in the presense of overflows.
If you actually want to make it proper standard C, I guess you'd have to make the thing unsigned, which gives you the mod-2**n guarantees even if somebody were to ever make a non-twos-complement machine.
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