[PATCH 0/4 v0.4] sched/umcg: RFC UMCG patchset

[Peter Oskolkov]

This is an update on v0.3:

https://lore.kernel.org/patchwork/cover/1461708/

Key changes v0.3 => v0.4:
- made idle workers list logic simpler
- only one idle server tracking
- removed two fields from struct umcg_task
- added timeout handling
- added worker preemption
- added a doc patch that now documents the syscalls and state
  transitions.

More details on the state of the patchset and future work are provided
in the patch 4 commit message.

Peter Oskolkov (4):
  sched: add WF_CURRENT_CPU and externise ttwu
  sched/umcg: RFC: add userspace atomic helpers
  sched/umcg: add Documentation/userspace-api/umcg.rst
  sched/umcg: RFC: implement UMCG syscalls

 Documentation/userspace-api/umcg.rst   | 532 ++++++++++++++++++++++
 arch/x86/entry/syscalls/syscall_64.tbl |   2 +
 include/linux/sched.h                  |   6 +
 include/linux/syscalls.h               |   4 +
 include/uapi/asm-generic/unistd.h      |   8 +-
 include/uapi/linux/umcg.h              | 114 +++++
 init/Kconfig                           |  10 +
 kernel/exit.c                          |   7 +
 kernel/sched/Makefile                  |   1 +
 kernel/sched/core.c                    |  20 +-
 kernel/sched/fair.c                    |   4 +
 kernel/sched/sched.h                   |  15 +-
 kernel/sched/umcg.c                    | 601 +++++++++++++++++++++++++
 kernel/sched/umcg.h                    | 211 +++++++++
 kernel/sys_ni.c                        |   4 +
 15 files changed, 1528 insertions(+), 11 deletions(-)
 create mode 100644 Documentation/userspace-api/umcg.rst
 create mode 100644 include/uapi/linux/umcg.h
 create mode 100644 kernel/sched/umcg.c
 create mode 100644 kernel/sched/umcg.h

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2.25.1