Thread (4 messages) 4 messages, 3 authors, 2016-07-23

Re: [PATCH] intel_pstate: Update cpu_frequency tracepoint every time

From: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Date: 2016-07-19 22:39:46
Also in: lkml

On Tue, 2016-07-19 at 15:10 +0200, Rafael J. Wysocki wrote:
From: Rafael J. Wysocki <redacted>

Currently, intel_pstate only updates the cpu_frequency tracepoint
if the new P-state to set is different from the current one, but
that causes powertop to report 100% idle on an 100% loaded system
sometimes.

Prevent that from happening by updating the cpu_frequency tracepoint
every time intel_pstate_update_pstate() is called.

Signed-off-by: Rafael J. Wysocki <redacted>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>-
quoted hunk ↗ jump to hunk
--
 drivers/cpufreq/intel_pstate.c |   12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

Index: linux-pm/drivers/cpufreq/intel_pstate.c
===================================================================
--- linux-pm.orig/drivers/cpufreq/intel_pstate.c
+++ linux-pm/drivers/cpufreq/intel_pstate.c
@@ -1134,17 +1134,12 @@ static void intel_pstate_get_min_max(str
 	*min = clamp_t(int, min_perf, cpu->pstate.min_pstate,
max_perf);
 }
 
-static inline void intel_pstate_record_pstate(struct cpudata *cpu,
int pstate)
-{
-	trace_cpu_frequency(pstate * cpu->pstate.scaling, cpu->cpu);
-	cpu->pstate.current_pstate = pstate;
-}
-
 static void intel_pstate_set_min_pstate(struct cpudata *cpu)
 {
 	int pstate = cpu->pstate.min_pstate;
 
-	intel_pstate_record_pstate(cpu, pstate);
+	trace_cpu_frequency(pstate * cpu->pstate.scaling, cpu->cpu);
+	cpu->pstate.current_pstate = pstate;
 	/*
 	 * Generally, there is no guarantee that this code will
always run on
 	 * the CPU being updated, so force the register update to
run on the
@@ -1304,10 +1299,11 @@ static inline void intel_pstate_update_p
 
 	intel_pstate_get_min_max(cpu, &min_perf, &max_perf);
 	pstate = clamp_t(int, pstate, min_perf, max_perf);
+	trace_cpu_frequency(pstate * cpu->pstate.scaling, cpu->cpu);
 	if (pstate == cpu->pstate.current_pstate)
 		return;
 
-	intel_pstate_record_pstate(cpu, pstate);
+	cpu->pstate.current_pstate = pstate;
 	wrmsrl(MSR_IA32_PERF_CTL, pstate_funcs.get_val(cpu,
pstate));
 }
 

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