mbox series

[v2,0/2] Rework interface between scheduler and schedutil governor

Message ID 20231026170913.32605-1-vincent.guittot@linaro.org (mailing list archive)
Headers show
Series Rework interface between scheduler and schedutil governor | expand

Message

Vincent Guittot Oct. 26, 2023, 5:09 p.m. UTC 
Following the discussion with Qais [1] about how to handle uclamp
requirements and after syncing with him, we agreed that I should move
forward on the patchset to rework the interface between scheduler and
schedutil governor to provide more information to the latter. Scheduler
(and EAS in particular) doesn't need anymore to guess estimate which
headroom the governor wants to apply and will directly ask for the target
freq. Then the governor directly gets the actual utilization and new
minimum and maximum boundaries to select this target frequency and
doesn't have to deal anymore with scheduler internals like uclamp when
including iowait boost.

[1] https://lore.kernel.org/lkml/CAKfTPtA5JqNCauG-rP3wGfq+p8EEVx9Tvwj6ksM3SYCwRmfCTg@mail.gmail.com/

Changes since v1
- fix a bug (always set max even when returning early)
- fix typos
  
Vincent Guittot (2):
  sched/schedutil: rework performance estimation
  sched/schedutil: rework iowait boost

 include/linux/energy_model.h     |  1 -
 kernel/sched/core.c              | 82 ++++++++++++-------------------
 kernel/sched/cpufreq_schedutil.c | 72 +++++++++++++++++----------
 kernel/sched/fair.c              | 22 +++++++--
 kernel/sched/sched.h             | 84 +++-----------------------------
 5 files changed, 103 insertions(+), 158 deletions(-)