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http://flint.cs.yale.edu/cs422/doc/sched-act.pdf
Scheduler Activations: Effective Kernel Support l 57 ACM Transactions on Computer Systems, Vol. 10, No. 1, February 1992. 2.1 The Case for User-Level Thread Management It is natural to believe that the performance optimizations found in user-level thread systems could be applied within the kernel, yielding kernel
http://homes.cs.washington.edu/~tom/pubs/sched_act.pdf
Scheduler Activations: Effective Kernel Support . 57 2.1 The Case for User-Level Thread Management It is natural to believe that the performance optimizations found in user-level thread systems could be applied within the kernel, yielding kernel threads that are as efficient as user-level threads without the compromises in func-tionality.
http://www.cs.cornell.edu/courses/cs614/1999sp/notes98/schedactiv.html
Scheduler Activations: Effective Kernel Support for the User-Level Management of Parallelism. Notes by Jia Wang and Lili Qiu (2/26/98)
http://infolab.stanford.edu/~daswani/quals/anderson92%20-%20scheduler%20activations.htm
Scheduler Activations: Effective Kernel Support for the User-Level Management of Parallelism. Anderson, et. Al . Threads either built at user-level or kernel-level. Advantages of kernel-threads: Order of magnitude better performance than using traditional processes. Each thread gets mapped to a physical processor while it is running.
https://research.cs.wisc.edu/areas/os/Qual/papers/scheduler-activations.pdf
Scheduler Activations: Effective Kernel Support for the User-Level Management of Parallelism Thomas E. Anderson, Brian N. Bershad, Edward D. Lazowska, and Henry M. Levy Department of Computer Science and Engineering
https://courses.cs.washington.edu/courses/csep551/04wi/Messages/paper12/0001.html
Jan 24, 2004 · activations), and 3) be aware of the changing needs of the user thread packages (in order to ensure that no processor time is wasted). The performance of the scheduler activation system was compared against a kernel thread system and an existing user-mode thread system. The latency of thread management calls on the scheduler activation system
https://cs.nyu.edu/rgrimm/teaching/sp07-os/activations.pdf
Scheduler Activations: Effective Kernel Support . 71 Table IV. Thread Operation Latencies(Wsec) FastThreads On FastThreads on Operation Topaz threack Scheduler Activations ToPaz threads Ultrix processes Null Fork 34 37 948 11300 Signal- Wait 37 42 441 1840 that user-level threads offer over kernel threads. There is a 3 psec. degrada-
http://pages.cs.wisc.edu/~swift/classes/cs736-fa12/blog/2012/10/scheduler_activations_effectiv.html
Thomas Anderson, Brian Bershad, Edward Lazowska, and Henry Levy. Scheduler Activations: Effective Kernel Support for the User-Level management of Parallelism. ACM Trans. on Computer Systems 10(1), Feburary 1992, pp. 53-79. Extra question: user-level threads fell out of favor a while ago but are becoming popular again now.
https://dl.acm.org/doi/10.1145/121132.121151
Next, we argue that the lack of system integration exhibited by user-level threads is a consequence of the lack of kernel support for user-level threads provided by contemporary multiprocessor operating systems; we thus argue that kernel threads or processes, as currently conceived, are the wrong abstraction on which to support user-level ...
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