P_NOLOAD + ULE = high load averages

Steve Kargl sgk at troutmask.apl.washington.edu
Wed Apr 21 08:58:19 PDT 2004

On Wed, Apr 21, 2004 at 03:32:30AM +0300, Nikos Ntarmos wrote:
> Hi all.
> There was a thread on "unusually high load averages" when running
> under sched_ule, which (afaik) came at an abrupt halt in January 2004.
> Anyway, I've been looking at this thing lately and have come to
> believe that "pagezero" is (one of) the culprit(s). IMO the source of
> the problem lies in /sys/kern/sched_ule.c having no provision for
> processes with P_NOLOAD set. With pagezero not running at PRI_ITHD,
> kseq_load_{add,rem} count pagezero as oh-another-normal-process, thus
> the "expected-plus-one" load reported in the above thread. The
> attached diff should fix this (at least it has fixed it here --
> running 5.2-CURRENT on a PCA56, just cvsup'ed from
> cvsup.gr.freebsd.org). Could someone please review/commit the changes
> or should I better send-pr it?


Jeff has been fairly quiet of the mailing list of late.  I suggest
that you submit a PR, so your patch doesn't get lost.


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