Markus, and anyone else wondering about interactive performance regressions, NEW_FAIR_SLEEPERS is modifiable at run time; just run
echo NEW_FAIR_SLEEPERS | sudo tee /sys/kernel/debug/sched_features
grep --color=tty NEW_FAIR_SLEEPERS /sys/kernel/debug/sched_features
(Ubuntu mounts linux's debugfs at /sys/kernel/debug, not at /debug like you see referenced on the lkml threads talking about this.)
To enable for every reboot, put echo NEW_FAIR_SLEEPERS > /sys/kernel/debug/sched_features in /etc/rc.local, or whatever.
Markus, and anyone else wondering about interactive performance regressions, NEW_FAIR_SLEEPERS is modifiable at run time; just run
echo NEW_FAIR_SLEEPERS | sudo tee /sys/kernel/ debug/sched_ features
grep --color=tty NEW_FAIR_SLEEPERS /sys/kernel/ debug/sched_ features
(Ubuntu mounts linux's debugfs at /sys/kernel/debug, not at /debug like you see referenced on the lkml threads talking about this.)
To enable for every reboot, put debug/sched_ features
echo NEW_FAIR_SLEEPERS > /sys/kernel/
in /etc/rc.local, or whatever.