sched: fix calc_delta_asym()

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calc_delta_asym() is supposed to do the same as calc_delta_fair() except
linearly shrink the result for negative nice processes - this causes them
to have a smaller preemption threshold so that they are more easily preempted.

The problem is that for task groups se->load.weight is the per cpu share of
the actual task group weight; take that into account.

Also provide a debug switch to disable the asymmetry (which I still don't
like - but it does greatly benefit some workloads)

This would explain the interactivity issues reported against group scheduling.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Cc: Mike Galbraith <efault@gmx.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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Peter Zijlstra 2008-06-27 13:41:12 +02:00 • committed by Ingo Molnar

parent a7be37ac8e

commit c9c294a630

2 changed files with 28 additions and 1 deletions

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28

kernel/sched_fair.c

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1

kernel/sched_features.h

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