Idle injection drivers today use RT threads to run idle loop. There are efficiency and accounting issues with the current intel_powerclamp.c and acpi_pad.c. A while ago, I posted CFS based idle injection patch trying to address them: https://lkml.org/lkml/2015/11/13/576
Peter proposed another approach with the introduction of a PF_IDLE flag. This patchset is based on his original posting: https://lkml.org/lkml/2014/6/4/56 These patches apply on top of the kworker and cpu hotplug state machine changes made to Intel powerclamp driver. https://lkml.org/lkml/2016/10/17/362 Similar changes to ACPI PAD driver is developed along with other enhancements. It will be posted after this patchset is accepted. Jacob Pan (2): cpuidle: allow setting deepest idle thermal/powerclamp: use PF_IDLE in injection kthread Peter Zijlstra (1): idle: add support for tasks that inject idle drivers/cpuidle/cpuidle.c | 12 +++ drivers/thermal/intel_powerclamp.c | 58 ++++++--------- include/linux/cpu.h | 2 + include/linux/cpuidle.h | 4 +- include/linux/sched.h | 3 +- kernel/fork.c | 3 + kernel/sched/core.c | 1 + kernel/sched/idle.c | 147 +++++++++++++++++++++---------------- 8 files changed, 130 insertions(+), 100 deletions(-) -- 1.9.1
