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/*
* Copyright (C) 2012 The CyanogenMod Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.settings.cyanogenmod;
import java.io.File;
import android.os.Bundle;
import android.os.SystemProperties;
import android.preference.CheckBoxPreference;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.Preference.OnPreferenceChangeListener;
import android.preference.PreferenceScreen;
import com.android.settings.R;
import com.android.settings.SettingsPreferenceFragment;
import com.android.settings.Utils;
public class MemoryManagement extends SettingsPreferenceFragment implements
OnPreferenceChangeListener {
public static final String KSM_RUN_FILE = "/sys/kernel/mm/ksm/run";
public static final String KSM_PREF = "pref_ksm";
public static final String KSM_PREF_DISABLED = "0";
public static final String KSM_PREF_ENABLED = "1";
private static final String ZRAM_PREF = "pref_zram_size";
private static final String ZRAM_PERSIST_PROP = "persist.service.zram"; // was compcache
private static final String ZRAM_DEFAULT = SystemProperties.get("ro.zram.default"); // was compcache
private static final String PURGEABLE_ASSETS_PREF = "pref_purgeable_assets";
private static final String PURGEABLE_ASSETS_PERSIST_PROP = "persist.sys.purgeable_assets";
private static final String PURGEABLE_ASSETS_DEFAULT = "0";
private ListPreference mzRAM;
private CheckBoxPreference mPurgeableAssetsPref;
private CheckBoxPreference mKSMPref;
private int swapAvailable = -1;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getPreferenceManager() != null) {
addPreferencesFromResource(R.xml.memory_management);
PreferenceScreen prefSet = getPreferenceScreen();
mzRAM = (ListPreference) prefSet.findPreference(ZRAM_PREF);
mPurgeableAssetsPref = (CheckBoxPreference) prefSet.findPreference(PURGEABLE_ASSETS_PREF);
mKSMPref = (CheckBoxPreference) prefSet.findPreference(KSM_PREF);
if (isSwapAvailable()) {
if (SystemProperties.get(ZRAM_PERSIST_PROP) == "1")
SystemProperties.set(ZRAM_PERSIST_PROP, ZRAM_DEFAULT);
mzRAM.setValue(SystemProperties.get(ZRAM_PERSIST_PROP, ZRAM_DEFAULT));
mzRAM.setOnPreferenceChangeListener(this);
} else {
prefSet.removePreference(mzRAM);
}
if (Utils.fileExists(KSM_RUN_FILE)) {
mKSMPref.setChecked(KSM_PREF_ENABLED.equals(Utils.fileReadOneLine(KSM_RUN_FILE)));
} else {
prefSet.removePreference(mKSMPref);
}
String purgeableAssets = SystemProperties.get(PURGEABLE_ASSETS_PERSIST_PROP,
PURGEABLE_ASSETS_DEFAULT);
mPurgeableAssetsPref.setChecked("1".equals(purgeableAssets));
}
}
@Override
public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
if (preference == mPurgeableAssetsPref) {
SystemProperties.set(PURGEABLE_ASSETS_PERSIST_PROP,
mPurgeableAssetsPref.isChecked() ? "1" : "0");
return true;
}
if (preference == mKSMPref) {
Utils.fileWriteOneLine(KSM_RUN_FILE, mKSMPref.isChecked() ? "1" : "0");
return true;
}
return false;
}
public boolean onPreferenceChange(Preference preference, Object newValue) {
if (preference == mzRAM) {
if (newValue != null) {
SystemProperties.set(ZRAM_PERSIST_PROP, (String) newValue);
return true;
}
}
return false;
}
/**
* Check if swap support is available on the system
*/
private boolean isSwapAvailable() {
if (swapAvailable < 0) {
swapAvailable = new File("/proc/swaps").exists() ? 1 : 0;
}
return swapAvailable > 0;
}
}
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