• Deepthi Dharwar's avatar
    powerpc/pseries/cpuidle: smt-snooze-delay cleanup. · 3fa8cad8
    Deepthi Dharwar authored
    smt-snooze-delay was designed to disable NAP state or delay the entry
    to the NAP state prior to adoption of cpuidle framework. This
    is per-cpu variable. With the coming of CPUIDLE framework,
    states can be disabled on per-cpu basis using the cpuidle/enable
    sysfs entry.
    
    Also, with the coming of cpuidle driver each state's target residency
    is per-driver unlike earlier which was per-device. Therefore,
    the per-cpu sysfs smt-snooze-delay which decides the target residency
    of the idle state on a particular cpu causes more confusion to the user
    as we cannot have different smt-snooze-delay (target residency)
    values for each cpu.
    
    In the current code, smt-snooze-delay functionality is completely broken.
    It makes sense to remove smt-snooze-delay from idle driver with the
    coming of cpuidle framework.
    However, sysfs files are retained as ppc64_util currently
    utilises it. Once we fix ppc64_util, propose to clean
    up the kernel code.
    Signed-off-by: default avatarDeepthi Dharwar <deepthi@linux.vnet.ibm.com>
    Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
    3fa8cad8
processor.h 13.7 KB