* Davide Libenzi <[email protected]> wrote:
> > ok - fortunately the delta between -v2-rc0 and -v2-final is pretty
> > small. One difference is the child-runs-first fix. To restore the
> > parent-runs-first logic, do this:
> >
> > echo 0 > /proc/sys/kernel/sched_child_runs_first
>
> Sorry, I did not follow the latest developments, but how many tunables
> we have so far in CFS? Are those for debug only or they're supposed to
> stay?
yeah, debug only. I strongly suspect the Kaffeine breakage for example
was related to child-runs-first, so userspace developers might be
interested in a switch to turn this on/off.
while reviewing the upstream scheduler it occured to me that we are
probably _not_ doing child-runs-first there due to the list_add_tail()
[it should be a list_add() for it to be child-first. But i havent
instrumented this heavily and this portion of the mainline scheduler is
pretty fragile.]. So via this flag we could also see the performance
impact, besides the compatibility impact.
> Weren't those listed inside the Axis of Evil (just to remain in topic
> :) till yesterday?
heh ;)
Ingo
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