Messages in this thread | | | Date | Tue, 15 Oct 2013 10:43:24 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH 06/14] sched: add period support for -deadline tasks. |
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On Tue, Oct 15, 2013 at 10:23:19AM +0200, Juri Lelli wrote: > On 10/14/2013 02:07 PM, Peter Zijlstra wrote: > > On Mon, Oct 14, 2013 at 12:43:38PM +0200, Juri Lelli wrote: > >> From: Harald Gustafsson <harald.gustafsson@ericsson.com> > >> > >> Make it possible to specify a period (different or equal than > >> deadline) for -deadline tasks. > > > > Could we add a little blurb here as to why we'd want this? > > > > (I think I do, and I certainly know where to find the answer, but its > > better to have a more complete changelog). > > > > Yes, I could amend the commit message in something like this: > > Make it possible to specify a period (different or equal than deadline) for > -deadline tasks. Relative deadlines (D_i) are used on task arrivals to generate > new scheduling (absolute) deadlines as "d = t + D_i", and periods (P_i) to > postpone the scheduling deadlines as "d = d + P_i" when the budget is zero. > This is in general useful to model (and schedule) tasks that have slow > activation rates (long periods), but have to be scheduled soon once activated > (short deadlines). > > What do you think?
Yes that's much better. Thanks!
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