Hi folks
I apologize for the one-big-patch-to-rule-them-all, I tried splitting but I
couldn't get to anything that made sense, so it's one big patch and a small
follow-up.
TL;DR of what I'd like to hear about:
o Is there interest in getting this in for !PREEMPT_RT reasons?
o Any ideas on how to make cgroup migration less horrible so we can fully pop
out the throttled cfs_rq se's?
Survives a good hour of my testing below on a 4-CPU QEMU system, but I expect
the throttled clocks & PELT to be busted.
Testing
=======
setup
+++++
mount -t cgroup -o cpu none /root/cpu
mkdir /root/cpu/cg0
echo 10000 > /root/cpu/cg0/cpu.cfs_period_us
echo 1000 > /root/cpu/cg0/cpu.cfs_quota_us
mkdir /root/cpu/cg0/cg00
mkdir /root/cpu/cg0/cg01
mkdir /root/cpu/cg0/cg00/cg000
mkdir /root/cpu/cg0/cg00/cg001
read.sh
+++++++
while true; do cat /sys/devices/system/cpu/smt/active &>/dev/null; done
repro.sh
++++++++
spawn() {
./read.sh &
PID=$!
echo "Tracing PID${PID}"
echo $PID > $1
}
spawn cpu/cg0/tasks
spawn cpu/cg0/tasks
spawn cpu/cg0/tasks
spawn cpu/cg0/tasks
spawn cpu/cg0/cg01/tasks
spawn cpu/cg0/cg00/cg000/tasks
spawn cpu/cg0/cg00/cg001/tasks
sleep 1
kill $(jobs -p)
Valentin Schneider (2):
sched/fair: Only throttle CFS tasks on return to userspace
sched/fair: Repurpose cfs_rq_throttled()
include/linux/sched.h | 2 +
kernel/sched/core.c | 6 +-
kernel/sched/debug.c | 4 +-
kernel/sched/fair.c | 296 +++++++++++++++++++++++++++---------------
kernel/sched/sched.h | 8 +-
5 files changed, 204 insertions(+), 112 deletions(-)
--
2.41.0