Hi Peter, This patch series combines the previous cleanup and optimization series. And as you and Ingo suggested, the increased kernel load scale is reinstated when on 64BIT and FAIR_GROUP_SCHED.
This patch series should have no perceivable changes to load and util except that load's range is increased by 1024 times. My initial tests suggest that, see this previous post's link for the figures: http://article.gmane.org/gmane.linux.kernel/2213506. The workload is running 100us out of every 200us, and 2000us out of every 8000us. Again fixed workload, fixed CPU, and fixed freq. And I believe the codes should be cleaner and more efficient after these patches. The changes leading to this version include changelog and code comment reword according to Peter's comments. Thanks, Yuyang Yuyang Du (12): sched/fair: Optimize sum computation with a lookup table sched/fair: Rename variable names for sched averages sched/fair: Change the variable to hold the number of periods to 32bit sched/fair: Add __always_inline compiler attribute to __accumulate_sum() sched/fair: Optimize __update_sched_avg() documentation: Add scheduler/sched-avg.txt sched/fair: Generalize the load/util averages resolution definition sched/fair: Remove SCHED_LOAD_SHIFT and SCHED_LOAD_SCALE sched/fair: Add introduction to the sched average metrics sched/fair: Remove scale_load_down() for load_avg sched/fair: Rename scale_load() and scale_load_down() sched/fair: Enable increased scale for kernel load Documentation/scheduler/sched-avg.txt | 94 ++++++++ include/linux/sched.h | 81 ++++++- kernel/sched/core.c | 8 +- kernel/sched/fair.c | 400 +++++++++++++++++---------------- kernel/sched/sched.h | 48 ++-- 5 files changed, 398 insertions(+), 233 deletions(-) create mode 100644 Documentation/scheduler/sched-avg.txt -- 1.7.9.5
