Current reclaim calculation for GRUB is a bit inaccurate and the inaccuracy gets larger as the bandwidth of tasks becomes smaller. There are couple of issues with the existing implementation: - Loss of precision in division due to rounding off. - Minor bug in the reclaim calculation. - In SMP, tasks with smaller reservation tend to reclaim less even if its the only task on a cpu. - Inaccuracy when normal deadline tasks and SCHED_FLAG_RECLAIM tasks share the cpu. This patch series aims to fix the above mentioned issues. Changes in v3 ------------- 1. Split the fixes into multiple self contained patches 2. Cover letter. Vineeth Pillai (5): sched/deadline: Fix bandwidth reclaim equation in GRUB sched/deadline: Fix reclaim inaccuracy with SMP sched/deadline: Remove unused variable extra_bw sched/deadline: Account for normal deadline tasks in GRUB Documentation: sched/deadline: Update GRUB description Documentation/scheduler/sched-deadline.rst | 28 ++-- kernel/sched/deadline.c | 160 ++++++++++----------- kernel/sched/sched.h | 18 ++- 3 files changed, 112 insertions(+), 94 deletions(-) -- 2.40.1
