• Vincent Guittot's avatar
    ARM: 7011/1: Add ARM cpu topology definition · c9018aab
    Vincent Guittot authored
    
    
    The affinity between ARM processors is defined in the MPIDR register.
    We can identify which processors are in the same cluster,
    and which ones have performance interdependency. We can define the
    cpu topology of ARM platform, that is then used by sched_mc and sched_smt.
    
    The default state of sched_mc and sched_smt config is disable.
    When enabled, the behavior of the scheduler can be modified with
    sched_mc_power_savings and sched_smt_power_savings sysfs interfaces.
    
    Changes since v4 :
    *  Remove unnecessary parentheses and blank lines
    
    Changes since v3 :
    * Update the format of printk message
    * Remove blank line
    
    Changes since v2 :
    * Update the commit message and some comments
    
    Changes since v1 :
    * Update the commit message
    * Add read_cpuid_mpidr in arch/arm/include/asm/cputype.h
    * Modify header of arch/arm/kernel/topology.c
    * Modify tests and manipulation of MPIDR's bitfields
    * Modify the place and dependancy of the config
    * Modify Noop functions
    Signed-off-by: default avatarVincent Guittot <vincent.guittot@linaro.org>
    Reviewed-by: default avatarAmit Kucheria <amit.kucheria@linaro.org>
    Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
    c9018aab
Kconfig 59.9 KB