[PATCH AUTOSEL 4.14 203/371] thermal: cpu_cooling: Actually trace CPU load in thermal_power_cpu_get_power

Sasha Levin
2020-01-16T18:23:12Z

From: Matthias Kaehlcke <mka@chromium.org>

[ Upstream commit bf45ac18b78038e43af3c1a273cae4ab5704d2ce ]

The CPU load values passed to the thermal_power_cpu_get_power
tracepoint are zero for all CPUs, unless, unless the
thermal_power_cpu_limit tracepoint is enabled too:

irq/41-rockchip-98 [000] .... 290.972410: thermal_power_cpu_get_power:
cpus=0000000f freq=1800000 load={{0x0,0x0,0x0,0x0}} dynamic_power=4815

vs

irq/41-rockchip-96 [000] .... 95.773585: thermal_power_cpu_get_power:
cpus=0000000f freq=1800000 load={{0x56,0x64,0x64,0x5e}} dynamic_power=4959
irq/41-rockchip-96 [000] .... 95.773596: thermal_power_cpu_limit:
cpus=0000000f freq=408000 cdev_state=10 power=416

There seems to be no good reason for omitting the CPU load information
depending on another tracepoint. My guess is that the intention was to
check whether thermal_power_cpu_get_power is (still) enabled, however
'load_cpu != NULL' already indicates that it was at least enabled when
cpufreq_get_requested_power() was entered, there seems little gain
from omitting the assignment if the tracepoint was just disabled, so
just remove the check.

Fixes: 6828a4711f99 ("thermal: add trace events to the power allocator governor")
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Javi Merino <javi.merino@kernel.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/thermal/cpu_cooling.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c
index 908a8014cf76..aed995ec2c90 100644
--- a/drivers/thermal/cpu_cooling.c
+++ b/drivers/thermal/cpu_cooling.c
@@ -514,7 +514,7 @@ static int cpufreq_get_requested_power(struct thermal_cooling_device *cdev,
load = 0;

total_load += load;
- if (trace_thermal_power_cpu_limit_enabled() && load_cpu)
+ if (load_cpu)
load_cpu[i] = load;

i++;
--
2.20.1