From: Dietmar Eggemann <dietmar.eggemann@arm.com>
To: Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Juri Lelli <juri.lelli@redhat.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>,
Steven Rostedt <rostedt@goodmis.org>,
Luca Abeni <luca.abeni@santannapisa.it>,
Daniel Bristot de Oliveira <bristot@redhat.com>,
Wei Wang <wvw@google.com>, Quentin Perret <qperret@google.com>,
Alessio Balsini <balsini@google.com>,
Pavan Kondeti <pkondeti@codeaurora.org>,
Patrick Bellasi <patrick.bellasi@matbug.net>,
Morten Rasmussen <morten.rasmussen@arm.com>,
Valentin Schneider <valentin.schneider@arm.com>,
Qais Yousef <qais.yousef@arm.com>,
linux-kernel@vger.kernel.org
Subject: [PATCH v2 3/6] sched/deadline: Add dl_bw_capacity()
Date: Mon, 27 Apr 2020 10:37:06 +0200 [thread overview]
Message-ID: <20200427083709.30262-4-dietmar.eggemann@arm.com> (raw)
In-Reply-To: <20200427083709.30262-1-dietmar.eggemann@arm.com>
Capacity-aware SCHED_DEADLINE admission control needs rd (root domain)
CPU capacity sum.
The design of this function follows that of dl_bw_cpus().
That is, return the rd CPU capacity sum in case the rd span a subset of
the cpu_active_mask.
Compute the CPU capacity sum over rd span and cpu_active_mask when in
hotplug.
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
---
kernel/sched/deadline.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 4ae22bfc37ae..eb23e6921d94 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -69,6 +69,25 @@ static inline int dl_bw_cpus(int i)
return cpus;
}
+
+static inline unsigned long dl_bw_capacity(int i)
+{
+ struct root_domain *rd = cpu_rq(i)->rd;
+ unsigned long cap;
+
+ RCU_LOCKDEP_WARN(!rcu_read_lock_sched_held(),
+ "sched RCU must be held");
+
+ if (cpumask_subset(rd->span, cpu_active_mask))
+ return rd->sum_cpu_capacity;
+
+ cap = 0;
+
+ for_each_cpu_and(i, rd->span, cpu_active_mask)
+ cap += capacity_orig_of(i);
+
+ return cap;
+}
#else
static inline struct dl_bw *dl_bw_of(int i)
{
@@ -79,6 +98,11 @@ static inline int dl_bw_cpus(int i)
{
return 1;
}
+
+static inline unsigned long dl_bw_capacity(int i)
+{
+ return SCHED_CAPACITY_SCALE;
+}
#endif
static inline
--
2.17.1
next prev parent reply other threads:[~2020-04-27 8:37 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-27 8:37 [PATCH v2 0/6] Capacity awareness for SCHED_DEADLINE Dietmar Eggemann
2020-04-27 8:37 ` [PATCH v2 1/6] sched/topology: Store root domain CPU capacity sum Dietmar Eggemann
2020-04-27 8:37 ` [PATCH v2 2/6] sched/deadline: Optimize dl_bw_cpus() Dietmar Eggemann
2020-04-30 10:55 ` Pavan Kondeti
2020-05-01 16:12 ` Dietmar Eggemann
2020-04-27 8:37 ` Dietmar Eggemann [this message]
2020-05-06 10:54 ` [PATCH v2 3/6] sched/deadline: Add dl_bw_capacity() Dietmar Eggemann
2020-05-06 12:37 ` Juri Lelli
2020-05-06 15:09 ` Dietmar Eggemann
2020-05-11 8:01 ` Juri Lelli
2020-05-12 12:39 ` Dietmar Eggemann
2020-05-15 12:26 ` Juri Lelli
2020-04-27 8:37 ` [PATCH v2 4/6] sched/deadline: Improve admission control for asymmetric CPU capacities Dietmar Eggemann
2020-04-27 8:37 ` [PATCH v2 5/6] sched/deadline: Make DL capacity-aware Dietmar Eggemann
2020-04-30 13:10 ` Pavan Kondeti
2020-05-01 16:12 ` Dietmar Eggemann
2020-05-04 3:58 ` Pavan Kondeti
2020-05-05 18:02 ` Dietmar Eggemann
2020-04-27 8:37 ` [PATCH v2 6/6] sched/deadline: Implement fallback mechanism for !fit case Dietmar Eggemann
2020-04-27 13:34 ` Juri Lelli
2020-04-27 14:17 ` luca abeni
2020-04-29 17:39 ` Dietmar Eggemann
2020-04-30 11:00 ` Pavan Kondeti
2020-05-01 16:12 ` Dietmar Eggemann
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