sched_ext tasks currently are starved by RT hoggers especially since RT throttling was replaced by deadline servers to boost only CFS tasks. Several users in the community have reported issues with RT stalling sched_ext tasks. Add a sched_ext deadline server as well so that sched_ext tasks are also boosted and do not suffer starvation. A kselftest is also provided to verify the starvation issues are now fixed. Andrea Righi (1): selftests/sched_ext: Add test for sched_ext dl_server Joel Fernandes (7): sched: Add support to pick functions to take rf sched: Add a server arg to dl_server_update_idle_time() sched/ext: Add a DL server for sched_ext tasks sched/debug: Fix updating of ppos on server write ops sched/debug: Stop and start server based on if it was active sched/debug: Add support to change sched_ext server params sched/deadline: Clear defer params include/linux/sched.h | 2 +- kernel/sched/core.c | 19 +- kernel/sched/deadline.c | 30 +-- kernel/sched/debug.c | 96 ++++---- kernel/sched/ext.c | 64 +++++- kernel/sched/fair.c | 15 +- kernel/sched/idle.c | 4 +- kernel/sched/rt.c | 2 +- kernel/sched/sched.h | 12 +- kernel/sched/stop_task.c | 2 +- tools/testing/selftests/sched_ext/Makefile | 1 + .../selftests/sched_ext/rt_stall.bpf.c | 23 ++ tools/testing/selftests/sched_ext/rt_stall.c | 213 ++++++++++++++++++ 13 files changed, 406 insertions(+), 77 deletions(-) create mode 100644 tools/testing/selftests/sched_ext/rt_stall.bpf.c create mode 100644 tools/testing/selftests/sched_ext/rt_stall.c -- 2.43.0
