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Subject[PATCH v2 4/7] sched/fair: Introduce sched_smt_siblings_idle()
Date
Architectures that implement arch_asym_cpu_priority() may need to know the
idle state of the SMT siblings of a CPU. The scheduler has this information
and functionality. Expose it.

Move the existing functionality outside of the NUMA code.

Cc: Ben Segall <bsegall@google.com>
Cc: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Len Brown <len.brown@intel.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Tim C. Chen <tim.c.chen@intel.com>
Cc: Valentin Schneider <vschneid@redhat.com>
Cc: x86@kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
---
Changes since v1:
* Introduced this patch.
---
include/linux/sched.h | 2 ++
kernel/sched/fair.c | 39 ++++++++++++++++++++++-----------------
2 files changed, 24 insertions(+), 17 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index ffb6eb55cd13..0d01c64ac737 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2426,4 +2426,6 @@ static inline void sched_core_fork(struct task_struct *p) { }

extern void sched_set_stop_task(int cpu, struct task_struct *stop);

+extern bool sched_smt_siblings_idle(int cpu);
+
#endif
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 0e4251f83807..9517c48df50e 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1052,6 +1052,28 @@ update_stats_curr_start(struct cfs_rq *cfs_rq, struct sched_entity *se)
* Scheduling class queueing methods:
*/

+static inline bool is_core_idle(int cpu)
+{
+#ifdef CONFIG_SCHED_SMT
+ int sibling;
+
+ for_each_cpu(sibling, cpu_smt_mask(cpu)) {
+ if (cpu == sibling)
+ continue;
+
+ if (!idle_cpu(sibling))
+ return false;
+ }
+#endif
+
+ return true;
+}
+
+bool sched_smt_siblings_idle(int cpu)
+{
+ return is_core_idle(cpu);
+}
+
#ifdef CONFIG_NUMA
#define NUMA_IMBALANCE_MIN 2

@@ -1691,23 +1713,6 @@ struct numa_stats {
int idle_cpu;
};

-static inline bool is_core_idle(int cpu)
-{
-#ifdef CONFIG_SCHED_SMT
- int sibling;
-
- for_each_cpu(sibling, cpu_smt_mask(cpu)) {
- if (cpu == sibling)
- continue;
-
- if (!idle_cpu(sibling))
- return false;
- }
-#endif
-
- return true;
-}
-
struct task_numa_env {
struct task_struct *p;

--
2.25.1
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