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powerpc/numa: Disable NEWIDLE balancing at node level 

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 \