]> pilppa.com Git - linux-2.6-omap-h63xx.git/commit
sched: fix calc_delta_asym()
authorPeter Zijlstra <a.p.zijlstra@chello.nl>
Fri, 27 Jun 2008 11:41:12 +0000 (13:41 +0200)
committerIngo Molnar <mingo@elte.hu>
Fri, 27 Jun 2008 12:31:28 +0000 (14:31 +0200)
commitc9c294a630e28eec5f2865f028ecfc58d45c0a5a
tree62fcfc395e98ff7a4ff6bee3364d0bb86024b171
parenta7be37ac8e1565e00880531f4e2aff421a21c803
sched: fix calc_delta_asym()

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>
kernel/sched_fair.c
kernel/sched_features.h