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Date: Mon, 18 Sep 2017 10:47:58 -0400 From: Steven Rostedt <rostedt@...dmis.org> To: Byungchul Park <byungchul.park@....com> Cc: peterz@...radead.org, mingo@...nel.org, linux-kernel@...r.kernel.org, juri.lelli@...il.com, kernel-team@....com Subject: Re: [PATCH v2 1/2] sched/deadline: Add cpudl_maximum_dl() for clean-up On Thu, 14 Sep 2017 10:05:18 +0900 Byungchul Park <byungchul.park@....com> wrote: > Changes from v1 > - Enhance commit msg > - Prevent WARN in cpumask_test_cpu() in cpudl_find() when best_cpu == -1 > > -----8<----- > >From 7735382d07ae6a61d740ae39ba2ecf169d43b8a2 Mon Sep 17 00:00:00 2001 > From: Byungchul Park <byungchul.park@....com> > Date: Wed, 22 Mar 2017 14:25:56 +0900 > Subject: [PATCH v2 1/2] sched/deadline: Add cpudl_maximum_dl() for clean-up > > Current code uses cpudl_maximum() to get the root node's cpu, while it > directly accesses the root node like 'cp->elements[0].dl' to get the > root node's dl. It would be more readible to add a function for the dl, > as well. Added it. Looks fine to me. Acked-by: Steven Rostedt (VMware) <rostedt@...dmis.org> -- Steve > > Signed-off-by: Byungchul Park <byungchul.park@....com> > --- > kernel/sched/cpudeadline.c | 11 ++++++++--- > 1 file changed, 8 insertions(+), 3 deletions(-) > > diff --git a/kernel/sched/cpudeadline.c b/kernel/sched/cpudeadline.c > index 8d9562d..9f02035 100644 > --- a/kernel/sched/cpudeadline.c > +++ b/kernel/sched/cpudeadline.c > @@ -108,11 +108,16 @@ static void cpudl_heapify(struct cpudl *cp, int idx) > cpudl_heapify_down(cp, idx); > } > > -static inline int cpudl_maximum(struct cpudl *cp) > +static inline int cpudl_maximum_cpu(struct cpudl *cp) > { > return cp->elements[0].cpu; > } > > +static inline u64 cpudl_maximum_dl(struct cpudl *cp) > +{ > + return cp->elements[0].dl; > +} > + > /* > * cpudl_find - find the best (later-dl) CPU in the system > * @cp: the cpudl max-heap context > @@ -130,11 +135,11 @@ int cpudl_find(struct cpudl *cp, struct task_struct *p, > cpumask_and(later_mask, cp->free_cpus, &p->cpus_allowed)) { > return 1; > } else { > - int best_cpu = cpudl_maximum(cp); > + int best_cpu = cpudl_maximum_cpu(cp); > WARN_ON(best_cpu != -1 && !cpu_present(best_cpu)); > > if (cpumask_test_cpu(best_cpu, &p->cpus_allowed) && > - dl_time_before(dl_se->deadline, cp->elements[0].dl)) { > + dl_time_before(dl_se->deadline, cpudl_maximum_dl(cp))) { > if (later_mask) > cpumask_set_cpu(best_cpu, later_mask); >
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