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powerpc/numa: Disable NEWIDLE balancing at node level

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On big POWER7 boxes we see large amounts of CPU time in system
processes like workqueue and watchdog kernel threads.

We currently rebalance the entire machine each time a task goes
idle and this is very expensive on large machines. Disable newidle
balancing at the node level and rely on the scheduler tick to
rebalance across nodes.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Anton Blanchard 2011-07-24 16:33:15 +00:00 committed by Benjamin Herrenschmidt
parent d4761ad2ef
commit 7bebcf0925
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/include/asm/topology.h
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@ -75,7 +75,7 @@ static inline int pcibus_to_node(struct pci_bus *bus)
.forkexec_idx = 0, \
\
.flags = 1*SD_LOAD_BALANCE \
| 1*SD_BALANCE_NEWIDLE \
| 0*SD_BALANCE_NEWIDLE \
| 1*SD_BALANCE_EXEC \
| 1*SD_BALANCE_FORK \
| 0*SD_BALANCE_WAKE \