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sched: Fix vmark regression on big machines

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SD_PREFER_SIBLING is set at the CPU domain level if power saving isn't
enabled, leading to many cache misses on large machines as we traverse
looking for an idle shared cache to wake to.  Change the enabler of
select_idle_sibling() to SD_SHARE_PKG_RESOURCES, and enable same at the
sibling domain level.

Reported-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1262612696.15495.15.camel@marge.simson.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Mike Galbraith 2010-01-04 14:44:56 +01:00 committed by Ingo Molnar
parent 24bc7347da
commit 50b926e439
2 changed files with 2 additions and 2 deletions
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2
include/linux/topology.h
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@ -99,7 +99,7 @@ int arch_update_cpu_topology(void);
| 1*SD_WAKE_AFFINE \ | 1*SD_WAKE_AFFINE \
| 1*SD_SHARE_CPUPOWER \ | 1*SD_SHARE_CPUPOWER \
| 0*SD_POWERSAVINGS_BALANCE \ | 0*SD_POWERSAVINGS_BALANCE \
| 0*SD_SHARE_PKG_RESOURCES \ | 1*SD_SHARE_PKG_RESOURCES \
| 0*SD_SERIALIZE \ | 0*SD_SERIALIZE \
| 0*SD_PREFER_SIBLING \ | 0*SD_PREFER_SIBLING \
, \ , \

2
kernel/sched_fair.c
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@ -1508,7 +1508,7 @@ static int select_task_rq_fair(struct task_struct *p, int sd_flag, int wake_flag
* If there's an idle sibling in this domain, make that * If there's an idle sibling in this domain, make that
* the wake_affine target instead of the current cpu. * the wake_affine target instead of the current cpu.
*/ */
if (tmp->flags & SD_PREFER_SIBLING) if (tmp->flags & SD_SHARE_PKG_RESOURCES)
target = select_idle_sibling(p, tmp, target); target = select_idle_sibling(p, tmp, target);
if (target >= 0) { if (target >= 0) {