sched: Turn on SD_BALANCE_NEWIDLE (840a0653) · Commits · 戴 / test

Start the re-tuning of the balancer by turning on newidle. It improves hackbench performance and parallelism on a 4x4 box. The "perf stat --repeat 10" measurements give us: domain0 domain1 ....................................... -SD_BALANCE_NEWIDLE -SD_BALANCE_NEWIDLE: 2041.273208 task-clock-msecs # 9.354 CPUs ( +- 0.363% ) +SD_BALANCE_NEWIDLE -SD_BALANCE_NEWIDLE: 2086.326925 task-clock-msecs # 11.934 CPUs ( +- 0.301% ) +SD_BALANCE_NEWIDLE +SD_BALANCE_NEWIDLE: 2115.289791 task-clock-msecs # 12.158 CPUs ( +- 0.263% ) Acked-by:

Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Andreas Herrmann <andreas.herrmann3@amd.com> Cc: Andreas Herrmann <andreas.herrmann3@amd.com> Cc: Gautham R Shenoy <ego@in.ibm.com> Cc: Balbir Singh <balbir@in.ibm.com> LKML-Reference: <new-submission> Signed-off-by:

Ingo Molnar <mingo@elte.hu>

arch/x86/include/asm/topology.h

+1 −1

Original line number	Original line	Diff line number	Diff line
	@@ -142,7 +142,7 @@ extern unsigned long node_remap_size[];
	.forkexec_idx = SD_FORKEXEC_IDX, \		.forkexec_idx = SD_FORKEXEC_IDX, \
	\		\
	.flags = 1*SD_LOAD_BALANCE \		.flags = 1*SD_LOAD_BALANCE \
	\| 0*SD_BALANCE_NEWIDLE \		\| 1*SD_BALANCE_NEWIDLE \
	\| 1*SD_BALANCE_EXEC \		\| 1*SD_BALANCE_EXEC \
	\| 1*SD_BALANCE_FORK \		\| 1*SD_BALANCE_FORK \
	\| 0*SD_WAKE_IDLE \		\| 0*SD_WAKE_IDLE \

include/linux/topology.h

+2 −2

Original line number	Original line	Diff line number	Diff line
	@@ -126,7 +126,7 @@ int arch_update_cpu_topology(void);
	.forkexec_idx = 1, \		.forkexec_idx = 1, \
	\		\
	.flags = 1*SD_LOAD_BALANCE \		.flags = 1*SD_LOAD_BALANCE \
	\| 0*SD_BALANCE_NEWIDLE \		\| 1*SD_BALANCE_NEWIDLE \
	\| 1*SD_BALANCE_EXEC \		\| 1*SD_BALANCE_EXEC \
	\| 1*SD_BALANCE_FORK \		\| 1*SD_BALANCE_FORK \
	\| 0*SD_WAKE_IDLE \		\| 0*SD_WAKE_IDLE \
	@@ -160,7 +160,7 @@ int arch_update_cpu_topology(void);
	.forkexec_idx = 1, \		.forkexec_idx = 1, \
	\		\
	.flags = 1*SD_LOAD_BALANCE \		.flags = 1*SD_LOAD_BALANCE \
	\| 0*SD_BALANCE_NEWIDLE \		\| 1*SD_BALANCE_NEWIDLE \
	\| 1*SD_BALANCE_EXEC \		\| 1*SD_BALANCE_EXEC \
	\| 1*SD_BALANCE_FORK \		\| 1*SD_BALANCE_FORK \
	\| 0*SD_WAKE_IDLE \		\| 0*SD_WAKE_IDLE \

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