David Xu 0dbb100b9b Move UPCALL related data structure out of kse, introduce a new ... data structure called kse_upcall to manage UPCALL. All KSE binding and loaning code are gone. A thread owns an upcall can collect all completed syscall contexts in its ksegrp, turn itself into UPCALL mode, and takes those contexts back to userland. Any thread without upcall structure has to export their contexts and exit at user boundary. Any thread running in user mode owns an upcall structure, when it enters kernel, if the kse mailbox's current thread pointer is not NULL, then when the thread is blocked in kernel, a new UPCALL thread is created and the upcall structure is transfered to the new UPCALL thread. if the kse mailbox's current thread pointer is NULL, then when a thread is blocked in kernel, no UPCALL thread will be created. Each upcall always has an owner thread. Userland can remove an upcall by calling kse_exit, when all upcalls in ksegrp are removed, the group is atomatically shutdown. An upcall owner thread also exits when process is in exiting state. when an owner thread exits, the upcall it owns is also removed. KSE is a pure scheduler entity. it represents a virtual cpu. when a thread is running, it always has a KSE associated with it. scheduler is free to assign a KSE to thread according thread priority, if thread priority is changed, KSE can be moved from one thread to another. When a ksegrp is created, there is always N KSEs created in the group. the N is the number of physical cpu in the current system. This makes it is possible that even an userland UTS is single CPU safe, threads in kernel still can execute on different cpu in parallel. Userland calls kse_create to add more upcall structures into ksegrp to increase concurrent in userland itself, kernel is not restricted by number of upcalls userland provides. The code hasn't been tested under SMP by author due to lack of hardware. Reviewed by: julian		2003-01-26 11:41:35 +00:00
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aim	Move UPCALL related data structure out of kse, introduce a new	2003-01-26 11:41:35 +00:00
compile	Don't need the .keep_me files. Obrien and I committed past each other.	2001-07-01 23:35:44 +00:00
conf	- Introduce the SCHED_ULE and SCHED_4BSD options for compile time selection	2003-01-26 05:29:12 +00:00
include	include cdefs.h so as to unbreak the libc build	2003-01-20 22:05:39 +00:00
ofw	Make ofw_pci_find_node() use the reg property instead of the	2003-01-09 12:24:19 +00:00
powermac	Remove M_TRYWAIT/M_WAITOK/M_WAIT. Callers should use 0.	2003-01-21 08:56:16 +00:00
powerpc	Move UPCALL related data structure out of kse, introduce a new	2003-01-26 11:41:35 +00:00
psim	Remove M_TRYWAIT/M_WAITOK/M_WAIT. Callers should use 0.	2003-01-21 08:56:16 +00:00