lkml.org 
[lkml]   [2002]   [Jan]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [2.4.17/18pre] VM and swap - it's really unusable


    On Tue, 8 Jan 2002, Daniel Phillips wrote:

    > On January 8, 2002 08:47 pm, Andrew Morton wrote:
    > > Daniel Phillips wrote:
    > > > What a preemptible kernel can do that a non-preemptible kernel can't is:
    > > > reschedule exactly as often as necessary, instead of having lots of extra
    > > > schedule points inserted all over the place, firing when *they* think the
    > > > time is right, which may well be earlier than necessary.
    > >
    > > Nope. `if (current->need_resched)' -> the time is right (beyond right,
    > > actually).
    >
    > Oops, sorry, right.
    >
    > The preemptible kernel can reschedule, on average, sooner than the
    > scheduling-point kernel, which has to wait for a scheduling point to roll
    > around.
    >
    mmhhh. At which cost? And then anyway if I have a spinlock, I still have
    to wait for a scheduling point to roll around.



    -
    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: 2005-03-22 13:15    [W:0.040 / U:0.028 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site