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Message-ID: <6c8c276e3e69da824dec179b68e6c120d1426a4a.camel@redhat.com> Date: Fri, 31 Oct 2025 16:51:58 +0100 From: Gabriele Monaco <gmonaco@...hat.com> To: Peter Zijlstra <peterz@...radead.org> Cc: Juri Lelli <juri.lelli@...hat.com>, linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>, Clark Williams <williams@...hat.com>, arighi@...dia.com Subject: Re: [RFC PATCH] sched/deadline: Avoid dl_server boosting with expired deadline On Fri, 2025-10-31 at 16:44 +0100, Peter Zijlstra wrote: > On Fri, Oct 31, 2025 at 04:41:22PM +0100, Gabriele Monaco wrote: > > > > Humm, let me noodle a bit more on this. Also, I should see if I can get > > > graphviz to draw ascii art state diagrams :-) > > > > Dot doesn't do it but graph-easy does reasonably well. > > yep, just found that. Seems to work well: > Nice! This can become also a model by the way. But I'd need a few more tracepoints ;) > > +----------------------+ > | A:init | <+ > +----------------------+ | > | | > | 1:dl_server_start | 4:pick_task_dl > v | > 2:update_curr_dl_se +----------------------+ | > +---------------------- | | | > | | B:zero_laxity-wait | | > +---------------------> | | <+------------------+ > +----------------------+ | | > | | | > | 3:dl_server_timer | | > v | | > +----------------------+ | | > +---------------------> | C:running | -+ | > 2:update_curr_dl_se > | +----------------------+ | > | | | > | 6:dl_server_timer | 5:update_curr_dl_se | > | v | > | +----------------------+ | > +---------------------- | D:replenish | --------------------+ > +----------------------+ > > Anyway, back to noodling on how to make it stop on idle :-)
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