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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Matthias Kaehlcke <mka@chromium.org>,
	Daniel Lezcano <daniel.lezcano@linaro.org>,
	Javi Merino <javi.merino@kernel.org>,
	Viresh Kumar <viresh.kumar@linaro.org>,
	Eduardo Valentin <edubezval@gmail.com>,
	Sasha Levin <sashal@kernel.org>,
	linux-pm@vger.kernel.org
Subject: [PATCH AUTOSEL 4.19 358/671] thermal: cpu_cooling: Actually trace CPU load in thermal_power_cpu_get_power
Date: Thu, 16 Jan 2020 11:59:56 -0500
Message-ID: <20200116170509.12787-95-sashal@kernel.org> (raw)
In-Reply-To: <20200116170509.12787-1-sashal@kernel.org>

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 dfd23245f778..9df6b7260466 100644
--- a/drivers/thermal/cpu_cooling.c
+++ b/drivers/thermal/cpu_cooling.c
@@ -458,7 +458,7 @@ 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


  parent reply index

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200116170509.12787-1-sashal@kernel.org>
2020-01-16 16:59 ` [PATCH AUTOSEL 4.19 357/671] thermal: rcar_gen3_thermal: fix interrupt type Sasha Levin
2020-01-16 16:59 ` Sasha Levin [this message]
2020-01-16 17:00 ` [PATCH AUTOSEL 4.19 394/671] cpufreq: brcmstb-avs-cpufreq: Fix initial command check Sasha Levin
2020-01-16 17:00 ` [PATCH AUTOSEL 4.19 395/671] cpufreq: brcmstb-avs-cpufreq: Fix types for voltage/frequency Sasha Levin
2020-01-16 17:01 ` [PATCH AUTOSEL 4.19 467/671] PM: sleep: Fix possible overflow in pm_system_cancel_wakeup() Sasha Levin
2020-01-16 17:02 ` [PATCH AUTOSEL 4.19 516/671] power: supply: Init device wakeup after device_add() Sasha Levin

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