User Managed Concurrency Groups is a fast context switching and in-process userspace scheduling framework. Two main use cases are security sandboxes and userspace scheduling. Security sandboxes: fast X-process context switching will open up a bunch of light-weight security tools, e.g. gVisor, or Tor Project's Shadow simulator, to more use cases. In-process userspace scheduling is used extensively at Google to provide latency control and isolation guarantees for diverse workloads while maintaining high CPU utilization. Signed-off-by: Peter Oskolkov <posk@xxxxxxxxxx> --- arch/x86/entry/syscalls/syscall_64.tbl | 11 +++++++++++ include/uapi/asm-generic/unistd.h | 25 ++++++++++++++++++++++++- init/Kconfig | 10 ++++++++++ kernel/sys_ni.c | 13 +++++++++++++ 4 files changed, 58 insertions(+), 1 deletion(-) diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl index ecd551b08d05..2e984a77eb23 100644 --- a/arch/x86/entry/syscalls/syscall_64.tbl +++ b/arch/x86/entry/syscalls/syscall_64.tbl @@ -368,6 +368,17 @@ 444 common landlock_create_ruleset sys_landlock_create_ruleset 445 common landlock_add_rule sys_landlock_add_rule 446 common landlock_restrict_self sys_landlock_restrict_self +447 common umcg_api_version sys_umcg_api_version +448 common umcg_register_task sys_umcg_register_task +449 common umcg_unregister_task sys_umcg_unregister_task +450 common umcg_wait sys_umcg_wait +451 common umcg_wake sys_umcg_wake +452 common umcg_swap sys_umcg_swap +453 common umcg_create_group sys_umcg_create_group +454 common umcg_destroy_group sys_umcg_destroy_group +455 common umcg_poll_worker sys_umcg_poll_worker +456 common umcg_run_worker sys_umcg_run_worker +457 common umcg_preempt_worker sys_umcg_preempt_worker # # Due to a historical design error, certain syscalls are numbered differently diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h index 6de5a7fc066b..cb8504e7ae07 100644 --- a/include/uapi/asm-generic/unistd.h +++ b/include/uapi/asm-generic/unistd.h @@ -873,8 +873,31 @@ __SYSCALL(__NR_landlock_add_rule, sys_landlock_add_rule) #define __NR_landlock_restrict_self 446 __SYSCALL(__NR_landlock_restrict_self, sys_landlock_restrict_self) +#define __NR_umcg_api_version 447 +__SYSCALL(__NR_umcg_api_version, sys_umcg_api_version) +#define __NR_umcg_register_task 448 +__SYSCALL(__NR_umcg_register_task, sys_umcg_register_task) +#define __NR_umcg_unregister_task 449 +__SYSCALL(__NR_umcg_unregister_task, sys_umcg_unregister_task) +#define __NR_umcg_wait 450 +__SYSCALL(__NR_umcg_wait, sys_umcg_wait) +#define __NR_umcg_wake 451 +__SYSCALL(__NR_umcg_wake, sys_umcg_wake) +#define __NR_umcg_swap 452 +__SYSCALL(__NR_umcg_swap, sys_umcg_swap) +#define __NR_umcg_create_group 453 +__SYSCALL(__NR_umcg_create_group, sys_umcg_create_group) +#define __NR_umcg_destroy_group 454 +__SYSCALL(__NR_umcg_destroy_group, sys_umcg_destroy_group) +#define __NR_umcg_poll_worker 455 +__SYSCALL(__NR_umcg_poll_worker, sys_umcg_poll_worker) +#define __NR_umcg_run_worker 456 +__SYSCALL(__NR_umcg_run_worker, sys_umcg_run_worker) +#define __NR_umcg_preempt_worker 457 +__SYSCALL(__NR_umcg_preempt_worker, sys_umcg_preempt_worker) + #undef __NR_syscalls -#define __NR_syscalls 447 +#define __NR_syscalls 458 /* * 32 bit systems traditionally used different diff --git a/init/Kconfig b/init/Kconfig index 1ea12c64e4c9..bfac88dd5d73 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1661,6 +1661,16 @@ config MEMBARRIER If unsure, say Y. +config UMCG + bool "Enable User Managed Concurrency Groups API" + default n + help + Enable UMCG core wait/wake/swap operations as well as UMCG + group/server/worker API. The core API is useful for fast IPC + and context switching, while the group/server/worker API, together + with the core API, form the basis for an in-process M:N userspace + scheduling framework implemented in lib/umcg. + config KALLSYMS bool "Load all symbols for debugging/ksymoops" if EXPERT default y diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c index 0ea8128468c3..fea55aa0222a 100644 --- a/kernel/sys_ni.c +++ b/kernel/sys_ni.c @@ -272,6 +272,19 @@ COND_SYSCALL(landlock_create_ruleset); COND_SYSCALL(landlock_add_rule); COND_SYSCALL(landlock_restrict_self); +/* kernel/sched/umcg.c */ +COND_SYSCALL(umcg_api_version); +COND_SYSCALL(umcg_register_task); +COND_SYSCALL(umcg_unregister_task); +COND_SYSCALL(umcg_wait); +COND_SYSCALL(umcg_wake); +COND_SYSCALL(umcg_swap); +COND_SYSCALL(umcg_create_group); +COND_SYSCALL(umcg_destroy_group); +COND_SYSCALL(umcg_poll_worker); +COND_SYSCALL(umcg_run_worker); +COND_SYSCALL(umcg_preempt_worker); + /* arch/example/kernel/sys_example.c */ /* mm/fadvise.c */ -- 2.31.1.818.g46aad6cb9e-goog
