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authortuukka.tikkanen@linaro.org <tuukka.tikkanen@linaro.org>2014-02-24 08:29:35 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-03-06 01:45:59 +0100
commit96e95182e95fd4e0069ff4d6ee1888fe9031d154 (patch)
treedfb20bf37e38982972b7fde9a0e7e8729aa3db22 /drivers/cpuidle/driver.c
parent61c66d6efa23759f1061d80ced668977fd28337d (diff)
cpuidle: Move perf multiplier calculation out of the selection loop
The menu governor performance multiplier defines a minimum predicted idle duration to latency ratio. Instead of checking this separately in every iteration of the state selection loop, adjust the overall latency restriction for the whole loop if this restriction is tighter than what is set by the QoS subsystem. The original test s->exit_latency * multiplier > data->predicted_us becomes s->exit_latency > data->predicted_us / multiplier by dividing both sides of the comparison by "multiplier". While division is likely to be several times slower than multiplication, the minor performance hit allows making a generic sleep state selection function based on (sleep duration, maximum latency) tuple. Signed-off-by: Tuukka Tikkanen <tuukka.tikkanen@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpuidle/driver.c')
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