2018-08-09 [Linux] .config

• 1. Latency

# CONFIG_FAULT_INJECTION is not set
CONFIG_LATENCYTOP=y

• 2. rwsem

one problem is that parallel unshare/mount causes high latency because CPU is overloaded too much (1000 processes on 1 CPU), and rwsem for namespace_lock() is unfair.

disable CONFIG_RWSEM_SPIN_ON_OWNER
CONFIG_RWSEM_SPIN_ON_OWNER=y

image.png

把kernel/Kconfig.locks里的RWSEM_SPIN_ON_OWNER的默认值
“def_bool y” 改为 “bool”，如下所示：

image.png

• 3. LOCKDEP_SUPPORT
     vim arch/x86/Kconfig
     “def_bool y” 改为 “bool”，如下所示：

image.png