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105 lines
2.4 KiB
105 lines
2.4 KiB
/* |
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** |
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** Copyright 2015, The Android Open Source Project |
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** |
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** Licensed under the Apache License, Version 2.0 (the "License"); |
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** you may not use this file except in compliance with the License. |
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** You may obtain a copy of the License at |
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** |
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** http://www.apache.org/licenses/LICENSE-2.0 |
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** |
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** Unless required by applicable law or agreed to in writing, software |
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** distributed under the License is distributed on an "AS IS" BASIS, |
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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** See the License for the specific language governing permissions and |
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** limitations under the License. |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <unistd.h> |
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#include <string> |
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#include <sstream> |
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#include <sys/types.h> |
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#include <sys/wait.h> |
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#include <cutils/properties.h> |
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#include "cpuconfig.h" |
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#include "perfprofdutils.h" |
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#define SYSFSCPU "/sys/devices/system/cpu" |
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HardwireCpuHelper::HardwireCpuHelper(bool perform) |
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: mpdecision_stopped_(false) |
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{ |
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if (perform && GetMpdecisionRunning()) { |
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mpdecision_stopped_ = true; |
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StopMpdecision(); |
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int ncores = GetNumCores(); |
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for (int i = 0; i < ncores; ++i) { |
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OnlineCore(i, 1); |
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} |
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} |
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} |
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HardwireCpuHelper::~HardwireCpuHelper() |
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{ |
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if (mpdecision_stopped_) { |
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RestartMpdecision(); |
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} |
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} |
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bool HardwireCpuHelper::GetMpdecisionRunning() |
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{ |
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char propBuf[PROPERTY_VALUE_MAX]; |
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property_get("init.svc.mpdecision", propBuf, ""); |
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return strcmp(propBuf, "running") == 0; |
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} |
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int HardwireCpuHelper::GetNumCores() |
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{ |
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int ncores = -1; |
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std::string possible(SYSFSCPU "/possible"); |
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FILE *fp = fopen(possible.c_str(), "re"); |
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if (fp) { |
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unsigned lo = 0, hi = 0; |
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if (fscanf(fp, "%u-%u", &lo, &hi) == 2) { |
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ncores = hi - lo + 1; |
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} |
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fclose(fp); |
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} |
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return ncores; |
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} |
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void HardwireCpuHelper::OnlineCore(int i, int onoff) |
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{ |
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std::stringstream ss; |
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ss << SYSFSCPU "/cpu" << i << "/online"; |
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FILE *fp = fopen(ss.str().c_str(), "we"); |
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if (fp) { |
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fprintf(fp, onoff ? "1\n" : "0\n"); |
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fclose(fp); |
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} else { |
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W_ALOGW("open failed for %s", ss.str().c_str()); |
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} |
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} |
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void HardwireCpuHelper::StopMpdecision() |
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{ |
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if (property_set("ctl.stop", "mpdecision")) { |
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W_ALOGE("setprop ctl.stop mpdecision failed"); |
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} |
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} |
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void HardwireCpuHelper::RestartMpdecision() |
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{ |
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// Don't try to offline the cores we previously onlined -- let |
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// mpdecision figure out what to do |
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if (property_set("ctl.start", "mpdecision")) { |
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W_ALOGE("setprop ctl.start mpdecision failed"); |
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} |
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}
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