lkml.org 
[lkml]   [2007]   [May]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    SubjectRe: [patch] CFS scheduler, -v8
    From
    On Wed, May 02, 2007 at 11:18:45PM -0400, Ting Yang wrote:
    > I just want to point out that ->wait_runtime, in fact, stores the lag of
    > each task in CFS, except that it is also used by other things, and
    > occasionally tweaked (heuristically ?). Under normal cases the sum of
    > lags of all active tasks in such a system, should be a constant 0. The
    > lag information is equally important to EEVDF, when some tasks leave the
    > system (becomes inactive) carrying certain amount of lag. The key point
    > here is that we have to spread the lag (either negative or positive) to
    > all remaining task, so that the fairness of the system is preserved. I
    > thinks CFS implementation does not seems to handle this properly.
    >
    > I am running out time today :-( I will write an email about CFS -v8
    > tomorrow, describing 2 issues in CFS I found related to this.

    Interesting. I haven't look at the code carefully but that wouldn't
    surprise me if this was the case and it led to odd corner cases.

    I'm eagerly waiting your analysis and explanation.

    bill

    -
    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: 2007-05-03 12:21    [W:0.020 / U:89.528 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site