From 1531f1b24d434d74274ec366aa7202c1a0187311 Mon Sep 17 00:00:00 2001 From: Lukasz Luba Date: Tue, 9 Oct 2018 17:36:12 +0200 Subject: [PATCH] ARM: omap2plus_defconfig: remove PROVE_LOCKING from defconfig PROVE_LOCKING enables LOCKDEP, which causes big overhead on cache and bus transactions. On some ARM big.LITTLE architecutres (Exynos 5433) the overhead is really big. The overhead can be measures using hackbench which will speed up by x3 times (11sec -> 3.4sec). When you check transaction on cache or buses, the results are way higher than normal for the same hackbench test: L1d cache invalidations: 26mln vs 4mln L2u cache invalidations: 42mln vs 12mln bus cyc/access: 30cyc/access vs. 20cyc/access context switch is x3 times cheaper Enable this option only when you have some locking issue to investigate. Signed-off-by: Lukasz Luba Signed-off-by: Tony Lindgren --- arch/arm/configs/omap2plus_defconfig | 1 - 1 file changed, 1 deletion(-) diff --git a/arch/arm/configs/omap2plus_defconfig b/arch/arm/configs/omap2plus_defconfig index 9c6f436d1b12..e07684fb80c8 100644 --- a/arch/arm/configs/omap2plus_defconfig +++ b/arch/arm/configs/omap2plus_defconfig @@ -537,7 +537,6 @@ CONFIG_DEBUG_INFO_SPLIT=y CONFIG_DEBUG_INFO_DWARF4=y CONFIG_MAGIC_SYSRQ=y CONFIG_SCHEDSTATS=y -CONFIG_PROVE_LOCKING=y # CONFIG_DEBUG_BUGVERBOSE is not set CONFIG_SECURITY=y CONFIG_CRYPTO_MICHAEL_MIC=y -- 2.11.0