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sched: Disable SD_PREFER_LOCAL at node level

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Yanmin Zhang reported that SD_PREFER_LOCAL induces an order of
magnitude increase in select_task_rq_fair() overhead while
running heavy wakeup benchmarks (tbench and vmark).

Since SD_BALANCE_WAKE is off at node level, turn SD_PREFER_LOCAL
off as well pending further investigation.

Reported-by: Zhang, Yanmin <yanmin_zhang@linux.intel.com>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Mike Galbraith 2009-11-02 20:36:51 +01:00 committed by Ingo Molnar
parent 49557e6203
commit 6b9de613ae
1 changed files with 1 additions and 1 deletions
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arch/x86/include/asm/topology.h
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@ -143,7 +143,7 @@ extern unsigned long node_remap_size[];
| 1*SD_BALANCE_FORK \ | 1*SD_BALANCE_FORK \
| 0*SD_BALANCE_WAKE \ | 0*SD_BALANCE_WAKE \
| 1*SD_WAKE_AFFINE \ | 1*SD_WAKE_AFFINE \
| 1*SD_PREFER_LOCAL \ | 0*SD_PREFER_LOCAL \
| 0*SD_SHARE_CPUPOWER \ | 0*SD_SHARE_CPUPOWER \
| 0*SD_POWERSAVINGS_BALANCE \ | 0*SD_POWERSAVINGS_BALANCE \
| 0*SD_SHARE_PKG_RESOURCES \ | 0*SD_SHARE_PKG_RESOURCES \