• Keith Busch's avatar
    node: Add memory-side caching attributes · acc02a10
    Keith Busch authored
    System memory may have caches to help improve access speed to frequently
    requested address ranges. While the system provided cache is transparent
    to the software accessing these memory ranges, applications can optimize
    their own access based on cache attributes.
    
    Provide a new API for the kernel to register these memory-side caches
    under the memory node that provides it.
    
    The new sysfs representation is modeled from the existing cpu cacheinfo
    attributes, as seen from /sys/devices/system/cpu/<cpu>/cache/.  Unlike CPU
    cacheinfo though, the node cache level is reported from the view of the
    memory. A higher level number is nearer to the CPU, while lower levels
    are closer to the last level memory.
    
    The exported attributes are the cache size, the line size, associativity
    indexing, and write back policy, and add the attributes for the system
    memory caches to sysfs stable documentation.
    Signed-off-by: default avatarKeith Busch <keith.busch@intel.com>
    Reviewed-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
    Reviewed-by: default avatarBrice Goglin <Brice.Goglin@inria.fr>
    Tested-by: default avatarBrice Goglin <Brice.Goglin@inria.fr>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    acc02a10
sysfs-devices-node 5.86 KB