On 18/02/2025 06:58, Shrikanth Hegde wrote:
[...]
There are a couple of issues and corner cases which need further
considerations:
- rt & dl: Realtime and deadline scheduling require some additional
attention.
I think we need to address atleast rt, there would be some non percpu
kworker threads which need to move out of parked cpus.
Yea, sounds reasonable. Would probably make sense to go next for that one.
- ext: Probably affected as well. Needs some conceptional
thoughts first.
- raciness: Right now, there are no synchronization efforts. It needs
to be considered whether those might be necessary or if
it is alright that the parked-state of a CPU might
change
during load-balancing.
Patches apply to tip:sched/core
The s390 patch serves as a simplified implementation example.
Gave it a try on powerpc with the debugfs file. it works for
sched_normal tasks.
That's great to hear!
Tobias Huschle (3):
sched/fair: introduce new scheduler group type group_parked
sched/fair: adapt scheduler group weight and capacity for parked CPUs
s390/topology: Add initial implementation for selection of parked CPUs
arch/s390/include/asm/smp.h | 2 +
arch/s390/kernel/smp.c | 5 ++
include/linux/sched/topology.h | 19 ++++++
kernel/sched/core.c | 13 ++++-
kernel/sched/fair.c | 104 ++++++++++++++++++++++++++++-----
kernel/sched/syscalls.c | 3 +
6 files changed, 130 insertions(+), 16 deletions(-)
