lkml.org 
[lkml]   [2004]   [Nov]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: page fault scalability patch V11 [0/7]: overview


    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.

    Linus
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2009-11-18 23:46    [W:5.175 / U:0.068 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site