From 7bebcf0925f09224393a8992af706fa39aa10395 Mon Sep 17 00:00:00 2001 From: Anton Blanchard Date: Sun, 24 Jul 2011 16:33:15 +0000 Subject: [PATCH] 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 Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/include/asm/topology.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/include/asm/topology.h b/arch/powerpc/include/asm/topology.h index d1c1d312f808..13efa4d95e76 100644 --- a/arch/powerpc/include/asm/topology.h +++ b/arch/powerpc/include/asm/topology.h @@ -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 \ -- 2.30.2