diff options
| author | Srivatsa Vaddagiri <vatsa@codeaurora.org> | 2014-03-31 19:42:27 -0700 |
|---|---|---|
| committer | Pavankumar Kondeti <pkondeti@codeaurora.org> | 2016-09-30 12:29:08 +0530 |
| commit | 4ac03df1e16b160b0630c38661eb7fc19e324912 (patch) | |
| tree | 15ebbc4c607fb437f3e1fcc78120d89fe2060e34 /arch/arm/kernel | |
| parent | 46692be6dd06ce405cb09cf8338b1f0edbbfb295 (diff) | |
arm: topology: Define arch_get_cpu_efficiency() API for scheduler
On a HMP system, scheduler needs to know efficiency factor
(instructions-per-cycle) for various cpus. This is so that scheduler
can estimate bandwidth consumption of tasks on each cpu, based on
their efficiency factor.
This patch defines arch_get_cpu_efficiency() API in ARM32 architecture.
It depends on hard-coded "efficiency" factor for various cpu types
(available in 'table_efficiency' data structure) and device-tree
providing information on cpu-type for every cpu.
Change-Id: I561bace8a813a35a9fc624fca4861c5b1109b69b
Signed-off-by: Srivatsa Vaddagiri <vatsa@codeaurora.org>
Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org>
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Diffstat (limited to 'arch/arm/kernel')
| -rw-r--r-- | arch/arm/kernel/topology.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c index 598323a1842e..9e7ed5c322f4 100644 --- a/arch/arm/kernel/topology.c +++ b/arch/arm/kernel/topology.c @@ -190,6 +190,13 @@ static int __init parse_cluster(struct device_node *cluster, int depth) return 0; } +static DEFINE_PER_CPU(unsigned long, cpu_efficiency) = SCHED_CAPACITY_SCALE; + +unsigned long arch_get_cpu_efficiency(int cpu) +{ + return per_cpu(cpu_efficiency, cpu); +} + #ifdef CONFIG_OF struct cpu_efficiency { const char *compatible; @@ -281,6 +288,8 @@ static int __init parse_dt_topology(void) if (cpu_eff->compatible == NULL) continue; + per_cpu(cpu_efficiency, cpu) = cpu_eff->efficiency; + rate = of_get_property(cn, "clock-frequency", &len); if (!rate || len != 4) { pr_err("%s missing clock-frequency property\n", |