Date: Thu, 27 Mar 2003 09:26:31 +0800 From: "David Xu" <davidxu@freebsd.org> To: "Jeff Roberson" <jroberson@chesapeake.net> Cc: arch@freebsd.org Subject: Re: 1:1 threading. Message-ID: <006a01c2f3ff$e57cb300$f001a8c0@davidw2k>
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After reading your 1:1 threading code, I think you needn't hack current KSE code to build your own 1:1 threading code. Our code allow you to do this, actully, it's my earlier idea to let 1:1 be implemented in our M:N code base, but never had told this to julian or others. if you want to create a thread, you can always call kse_create syscall(the name should be changed to another, for example upcall_create), the newly created upcall will be scheduled a kernel thread on it and return to userland thread stack and thread function, if you want to implement 1:1, you can always set kse_mailbox.km_curthread to NULL, this ensures that userland stack always has fixed association with kernel thread stack, for me, 1:1 only means userland stack has fixed association with kernel thread stack, no more. however, code in kse_create should be adjusted to allow NUPCALLS > NCPUS, this allows 1:1 mode to be implemented. thr_exit can be implemented to use kse_exit, and maybe a wrapper to for kse_exit. For thr_kill, I think we may add an API to allow a kernel thread be identified by using kse_mailbox pointer or something similar. By implementing 1:1 code in current M:N code base, benifit is very clear, a ksegrp protects time quantum and threads priority, and if you want to implement a system scope thread(I know pthread has this requirement), just call kse_create with newgroup parameters is 1, you will immediately get a system scope thread. Yes, you may think that KSE progress is slow, but I'd like to think harder before pushing some not well thinked code into kernel. At least, when I am thinking about M:N, I am also thinking about 1:1, I guess some people like 1:1, and others like M:N, so more choise = is good. David Xu ----- Original Message -----=20 From: "Jeff Roberson" <jroberson@chesapeake.net> To: <kse@elischer.org> Sent: Wednesday, March 26, 2003 11:00 AM Subject: 1:1 threading. > I just sent a mail to arch@ about a parallel effort that you all may = be > interested in. Please follow up there. >=20 > Thanks, > Jeff
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