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authorMike Galbraith <efault@gmx.de>2009-09-09 09:41:37 -0400
committerIngo Molnar <mingo@elte.hu>2009-09-09 11:30:05 -0400
commit2bba22c50b06abe9fd0d23933b1e64d35b419262 (patch)
tree5ac0373fa1d18f043cb27183f9f185ceda598915 /net/can/Makefile
parentb5d9d734a53e0204aab0089079cbde2a1285a38f (diff)
sched: Turn off child_runs_first
Set child_runs_first default to off. It hurts 'optimal' make -j<NR_CPUS> workloads as make jobs get preempted by child tasks, reducing parallelism. Note, this patch might make existing races in user applications more prominent than before - so breakages might be bisected to this commit. Child-runs-first is broken on SMP to begin with, and we already had it off briefly in v2.6.23 so most of the offenders ought to be fixed. Would be nice not to revert this commit but fix those apps finally ... Signed-off-by: Mike Galbraith <efault@gmx.de> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1252486344.28645.18.camel@marge.simson.net> [ made the sysctl independent of CONFIG_SCHED_DEBUG, in case people want to work around broken apps. ] Signed-off-by: Ingo Molnar <mingo@elte.hu>
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