lkml.org 
[lkml]   [2017]   [Jul]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v3 06/10] drivers base/arch_topology: allow inlining cpu-invariant accounting support
Date
Allow inlining of topology_get_cpu_scale() into the task
scheduler fast path (e.g. __update_load_avg_se()) by coding it as a
static inline function in the arch topology header file.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Juri Lelli <juri.lelli@arm.com>
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
---
drivers/base/arch_topology.c | 7 +------
include/linux/arch_topology.h | 8 +++++++-
2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index af9ab98a233e..c8cd92ba4cc0 100644
--- a/drivers/base/arch_topology.c
+++ b/drivers/base/arch_topology.c
@@ -37,12 +37,7 @@ void arch_set_freq_scale(struct cpumask *cpus, unsigned long cur_freq,
}

static DEFINE_MUTEX(cpu_scale_mutex);
-static DEFINE_PER_CPU(unsigned long, cpu_scale) = SCHED_CAPACITY_SCALE;
-
-unsigned long topology_get_cpu_scale(struct sched_domain *sd, int cpu)
-{
- return per_cpu(cpu_scale, cpu);
-}
+DEFINE_PER_CPU(unsigned long, cpu_scale) = SCHED_CAPACITY_SCALE;

void topology_set_cpu_scale(unsigned int cpu, unsigned long capacity)
{
diff --git a/include/linux/arch_topology.h b/include/linux/arch_topology.h
index 3e3c2657c9a1..0c4e43d6a3bb 100644
--- a/include/linux/arch_topology.h
+++ b/include/linux/arch_topology.h
@@ -11,8 +11,14 @@ void topology_normalize_cpu_scale(void);
struct device_node;
int topology_parse_cpu_capacity(struct device_node *cpu_node, int cpu);

+DECLARE_PER_CPU(unsigned long, cpu_scale);
+
struct sched_domain;
-unsigned long topology_get_cpu_scale(struct sched_domain *sd, int cpu);
+static inline
+unsigned long topology_get_cpu_scale(struct sched_domain *sd, int cpu)
+{
+ return per_cpu(cpu_scale, cpu);
+}

void topology_set_cpu_scale(unsigned int cpu, unsigned long capacity);

--
2.11.0
\
 
 \ /
  Last update: 2017-07-27 21:35    [W:0.076 / U:18.712 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site