remove ThermalManager

It throttles 1000x more than intended, and I suspect that some of the
trip points it uses to decide when to throttle make no sense.  We've
already turned it off on the Nexus 5x.

Change-Id: Idf556a83fe61ccc5f63c7bede3eecbe80087e28b
Reviewed-on: https://skia-review.googlesource.com/81303
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>

2 files changed, 0 insertions, 174 deletions

diff --git a/tools/ThermalManager.cpp b/tools/ThermalManager.cpp
deleted file mode 100644
index e0c7c44c69..0000000000
--- a/tools/ThermalManager.cpp
+++ /dev/null
@@ -1,113 +0,0 @@
-/*
- * 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
-}
-
-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
diff --git a/tools/ThermalManager.h b/tools/ThermalManager.h
deleted file mode 100644
index 747cf52691..0000000000
--- a/tools/ThermalManager.h
+++ /dev/null
@@ -1,61 +0,0 @@
-/*
- * Copyright 2016 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef ThermalManager_DEFINED
-#define ThermalManager_DEFINED
-
-#include "../private/SkTArray.h"
-#include "SkString.h"
-
-#if defined(SK_BUILD_FOR_ANDROID) || defined(SK_BUILD_FOR_UNIX)
-#    define THERMAL_MANAGER_SUPPORTED
-#endif
-
-#ifdef THERMAL_MANAGER_SUPPORTED
-
-/*
- * This simple class monitors the thermal part of sysfs to ensure we don't trigger thermal events
- */
-
-class ThermalManager {
-public:
-    ThermalManager(int32_t threshold, uint32_t sleepIntervalMs, uint32_t timeoutMs);
-
-    bool coolOffIfNecessary();
-
-private:
-    static int32_t OpenFileAndReadInt32(const char* path);
-
-    // current temperature can be read from /thermalZonePath/temp
-    static int32_t GetTemp(SkString thermalZonePath) {
-        SkString temperatureFilePath(thermalZonePath);
-        temperatureFilePath.appendf("/temp");
-        return OpenFileAndReadInt32(temperatureFilePath.c_str());
-    }
-
-    struct TripPoint {
-        TripPoint(SkString thermalZoneRoot, SkString pointName, int32_t threshold);
-
-        bool willTrip();
-
-        SkString fThermalZoneRoot;
-        SkString fPointName;
-        int32_t fBase;
-        int32_t fPoint;
-        int32_t fThreshold;
-
-        // Certain trip points seem to start tripped.  For example, I have seen trip points of 0 or
-        // negative numbers.
-        bool fDisabled;
-    };
-
-    SkTArray<TripPoint> fTripPoints;
-    uint32_t fSleepIntervalMs;
-    uint32_t fTimeoutMs;
-};
-#endif
-#endif