e1745a1efc
BUG=skia: GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1684653002 Review URL: https://codereview.chromium.org/1684653002
118 lines
3.7 KiB
C++
118 lines
3.7 KiB
C++
/*
|
|
* Copyright 2016 Google Inc.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license that can be
|
|
* found in the LICENSE file.
|
|
*/
|
|
|
|
#include "ThermalManager.h"
|
|
|
|
#include "SkOSFile.h"
|
|
|
|
#include <stdio.h>
|
|
|
|
#ifndef SK_BUILD_FOR_WIN32
|
|
#include <unistd.h>
|
|
#endif
|
|
|
|
#ifdef THERMAL_MANAGER_SUPPORTED
|
|
|
|
/*
|
|
* ThermalManager is completely dependent on sysfs to monitor thermal temperatures. In sysfs
|
|
* thermal management is controlled by a number of thermal zones. They are laid out as follows:
|
|
* /sys/class/thermal/thermal_zoneN where N is the number of the thermal zone starting at 0.
|
|
*
|
|
* Inside each thermal_zone folder is a file called 'temp,' which has the current temperature
|
|
* reading from the sensor in that zone, as well as 0 or more files called 'trip_point_N_temp.'
|
|
*
|
|
* When the reading in temp is greater than one of the numbers in the trip_point files, then the
|
|
* kernel will take some kind of action. This is all documented online.
|
|
*
|
|
* In any case, the goal of this class is to sleep right before a trip point is about to be
|
|
* triggered, thus naturally cooling the system and preventing thermal throttling.
|
|
*/
|
|
|
|
ThermalManager::ThermalManager(int32_t threshold, uint32_t sleepIntervalMs, uint32_t timeoutMs)
|
|
: fSleepIntervalMs(sleepIntervalMs)
|
|
, fTimeoutMs(timeoutMs) {
|
|
static const char* kThermalZonePath = "/sys/class/thermal/";
|
|
SkOSFile::Iter it(kThermalZonePath);
|
|
SkString path;
|
|
while (it.next(&path, true)) {
|
|
if (!path.contains("thermal_zone")) {
|
|
continue;
|
|
}
|
|
|
|
SkString fullPath(kThermalZonePath);
|
|
fullPath.append(path);
|
|
SkOSFile::Iter thermalZoneIt(fullPath.c_str());
|
|
|
|
SkString filename;
|
|
while (thermalZoneIt.next(&filename)) {
|
|
if (!(filename.contains("trip_point") && filename.contains("temp"))) {
|
|
continue;
|
|
}
|
|
|
|
fTripPoints.push_back(TripPoint(fullPath, filename, threshold));
|
|
}
|
|
}
|
|
}
|
|
|
|
bool ThermalManager::coolOffIfNecessary() {
|
|
uint32_t i = 0, totalTimeSleptMs = 0;
|
|
while (i < (uint32_t)fTripPoints.count() && totalTimeSleptMs < fTimeoutMs) {
|
|
if (fTripPoints[i].willTrip()) {
|
|
sleep(fSleepIntervalMs);
|
|
totalTimeSleptMs += fSleepIntervalMs;
|
|
} else {
|
|
i++;
|
|
}
|
|
}
|
|
|
|
return totalTimeSleptMs < fTimeoutMs;
|
|
}
|
|
|
|
int32_t ThermalManager::OpenFileAndReadInt32(const char* path) {
|
|
FILE* tempFile = fopen(path, "r");
|
|
SkASSERT(tempFile);
|
|
int32_t value;
|
|
int ret = fscanf(tempFile, "%d", &value);
|
|
if (!ret) {
|
|
SkDebugf("Could not read temperature\n");
|
|
SkASSERT(false);
|
|
}
|
|
|
|
fclose(tempFile);
|
|
return value;
|
|
}
|
|
|
|
ThermalManager::TripPoint::TripPoint(SkString thermalZoneRoot, SkString pointName,
|
|
int32_t threshold)
|
|
: fThermalZoneRoot(thermalZoneRoot)
|
|
, fPointName(pointName) {
|
|
SkString fullPath(thermalZoneRoot);
|
|
fullPath.appendf("/%s", pointName.c_str());
|
|
fPoint = OpenFileAndReadInt32(fullPath.c_str());
|
|
fBase = GetTemp(fThermalZoneRoot);
|
|
fThreshold = threshold;
|
|
fDisabled = fBase + fThreshold >= fPoint; // We disable any trip point which start off
|
|
// triggered
|
|
if (!fDisabled) {
|
|
SkDebugf("Trip point %s base - %d trip point-%d\n", fullPath.c_str(),
|
|
fBase, fPoint);
|
|
}
|
|
}
|
|
|
|
bool ThermalManager::TripPoint::willTrip() {
|
|
int32_t currentTemp = GetTemp(fThermalZoneRoot);
|
|
bool wouldTrip = !fDisabled && currentTemp + fThreshold >= fPoint;
|
|
|
|
if (wouldTrip) {
|
|
SkDebugf("%s/%s would trip {%d,%d,%d,%d}\n", fThermalZoneRoot.c_str(),
|
|
fPointName.c_str(), fBase, currentTemp, fPoint, fThreshold);
|
|
}
|
|
return wouldTrip;
|
|
}
|
|
|
|
#endif
|