lkml.org 
[lkml]   [2007]   [Apr]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    SubjectRe: [patch 1/4] Ignore stolen time in the softlockup watchdog
    From
    Date
    On Tue, 2007-04-24 at 22:59 +0200, Ingo Molnar wrote:
    > * Daniel Walker <dwalker@mvista.com> wrote:
    >
    > > On Tue, 2007-04-24 at 13:24 -0700, Jeremy Fitzhardinge wrote:
    > >
    > > > And sched_clock's use of local_irq_save/restore appears to be absolutely
    > > > correct, so I think it must be triggering a bug in either the self-tests
    > > > or lockdep itself.
    > >
    > > Why does sched_clock need to disable interrupts?
    >
    > i concur. To me it appears not "absolutely correct" that someone
    > apparently added local_irq_save/restore to sched_clock(), but "absolute
    > madness". sched_clock() is _very_ performance-sensitive for the
    > scheduler, do not mess with it.

    It looks like it's used in some sort of warp check, but only when
    jiffies is used .. So I'm totally stumped why it's in there..

    Daniel

    -
    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: 2007-04-24 23:05    [W:0.031 / U:29.204 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site