Messages in this thread | | | Date | Sat, 24 Feb 2007 13:10:33 -0800 (PST) | From | Davide Libenzi <> | Subject | Re: [patch 04/13] syslets: core code |
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On Sat, 24 Feb 2007, Ingo Molnar wrote:
> * Davide Libenzi <davidel@xmailserver.org> wrote: > > > > +asmlinkage long > > > +sys_threadlet_on(unsigned long restore_stack, > > > + unsigned long restore_eip, > > > + struct async_head_user __user *ahu) > > > > +asmlinkage long sys_threadlet_off(void) > > > If we have a new syscall that does the exec, we can save the two > > on/off calls. > > the on/off calls are shaped in a way that makes them ultimately > vsyscall-able - the kernel only needs to know about the fact that we are > in a threadlet (so that the scheduler can do its special > push-head-to-another-context thing) - and this can be signalled via a > small user-space-side info structure as well, put into the TLS.
IMO it's not a matter of speed. We'll have those two new syscalls, that I don't see other practical use for. IMO the best thing would be to hide all inside the sys_threadlet_exec (or whatever name).
> > [...] Also, the complete_thread() thingy can be done automatically > > from inside the kernel upon function return, by hence making the > > threadlet function look like a normal thread function: > > yeah - and that's how it works in my current codebase already, > threadlet_off() takes a 'completion event' pointer as well, and the ahu. > I'll release v4 so that you can have a look.
Ok. Will look into it...
- Davide
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