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SubjectRe: [git] CFS-devel, group scheduler, fixes
On Thu, Sep 20, 2007 at 09:15:07AM +0200, Mike Galbraith wrote:
> But, I did just manage to trigger some horrid behavior, and log it. I
> modified the kernel to print task's actual tree key instead of their
> current vruntime, and was watching that while make -j2 was running (and
> not seeing anything very interesting), when on a lark, I restarted
> SuSE's system updater thingy. That beast chews 100% CPU for so long at
> startup that I long ago got annoyed, and changed it to run at nice 19.
> Anyway, when it started, interactivity went to hell in the proverbial
> hand-basket, and the sched_debug log shows some interesting results..
> like spread0 hitting -13659412644, and cc1 being keyed at -3867063305.
>
> cpu#0, 2992.608 MHz
> .nr_running : 4
> .load : 4096
> .nr_switches : 1105882
> .nr_load_updates : 735146
> .nr_uninterruptible : 4294966399

(...)

> cpu#1, 2992.608 MHz
> .nr_running : 5
> .load : 6208
> .nr_switches : 1012995
> .nr_load_updates : 747540
> .nr_uninterruptible : 897

I don't know if this is relevant, but 4294966399 in nr_uninterruptible
for cpu#0 equals -897, exactly the negation of cpu1.nr_uninterruptible.
I don't know if this rings a bell for someone or if it's a completely
useless comment, but just in case...

HTH,
Willy

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