[lkml]   [2004]   [Nov]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: page fault scalability patch V11 [0/7]: overview
    On Fri, Nov 19, 2004 at 11:59:03AM -0800, Linus Torvalds wrote:
    > You could also make "rss" be a _signed_ integer per-thread.
    > When unmapping a page, you decrement one of the threads that shares the mm
    > (doesn't matter which - which is why the per-thread rss may go negative),
    > and when mapping a page you increment it.
    > Then, anybody who actually wants a global rss can just iterate over
    > threads and add it all up. If you do it under the mmap_sem, it's stable,
    > and if you do it outside the mmap_sem it's imprecise but stable in the
    > long term (ie errors never _accumulate_, like the non-atomic case will
    > do).
    > Does anybody care enough? Maybe, maybe not. It certainly sounds a hell of
    > a lot better than the periodic scan.

    Unprivileged triggers for full-tasklist scans are NMI oops material.

    -- wli
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2005-03-22 14:08    [W:0.020 / U:350.940 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site