| Date | Tue, 8 Nov 2022 11:47:38 +0100 | From | Frederic Weisbecker <> | Subject | Re: [PATCH v4 14/16] timer: Implement the hierarchical pull model |
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On Fri, Nov 04, 2022 at 03:57:35PM +0100, Anna-Maria Behnsen wrote: > @@ -1859,6 +1863,36 @@ void forward_and_idle_timer_bases(unsigned long basej, u64 basem, > */ > is_idle = time_after(nextevt, basej + 1); > > + if (is_idle) { > + u64 next_tmigr; > + > + next_tmigr = tmigr_cpu_deactivate(tevt->global); > + > + tevt->global = KTIME_MAX; > + > + /* > + * If CPU is the last going idle in timer migration > + * hierarchy, make sure CPU will wake up in time to handle > + * remote timers. next_tmigr == KTIME_MAX if other CPUs are > + * still active. > + */ > + if (next_tmigr < tevt->local) { > + u64 tmp; > + > + /* If we missed a tick already, force 0 delta */ > + if (next_tmigr < basem) > + next_tmigr = basem; > + > + tmp = div_u64(next_tmigr - basem, TICK_NSEC); > + > + nextevt = basej + (unsigned long)tmp; > + tevt->local = next_tmigr; > + is_idle = time_after(nextevt, basej + 1);
So after that, tevt->global shouldn't matter anymore for tick_nohz_next_event(), right? If so then probably that line can go away (with a comment specifying why we can ignore the global part)?:
tevt.local = min_t(u64, tevt.local, tevt.global);
Thanks.
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