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// Copyright 2014 The Bazel Authors. All rights reserved.
//
// 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.google.devtools.build.lib.util;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.CharMatcher;
import com.google.common.collect.ImmutableMap;
import com.google.common.io.Files;
import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import java.util.List;
import java.util.Map;
/**
* Parse and return information from /proc/meminfo.
*/
public class ProcMeminfoParser {
public static final String FILE = "/proc/meminfo";
private final Map<String, Long> memInfo;
/**
* Populates memory information by reading /proc/meminfo.
* @throws IOException if reading the file failed.
*/
public ProcMeminfoParser() throws IOException {
this(FILE);
}
@VisibleForTesting
public ProcMeminfoParser(String fileName) throws IOException {
List<String> lines = Files.readLines(new File(fileName), Charset.defaultCharset());
ImmutableMap.Builder<String, Long> builder = ImmutableMap.builder();
for (String line : lines) {
int colon = line.indexOf(':');
String keyword = line.substring(0, colon);
String valString = line.substring(colon + 1);
try {
long val = Long.parseLong(CharMatcher.inRange('0', '9').retainFrom(valString));
builder.put(keyword, val);
} catch (NumberFormatException e) {
// Ignore: we'll fail later if somebody tries to capture this value.
}
}
memInfo = builder.build();
}
/**
* Gets a named field in KB.
*/
public long getRamKb(String keyword) {
Long val = memInfo.get(keyword);
if (val == null) {
throw new IllegalArgumentException("Can't locate " + keyword + " in the /proc/meminfo");
}
return val;
}
/**
* Return the total physical memory.
*/
public long getTotalKb() {
return getRamKb("MemTotal");
}
/**
* Return the inactive memory.
*/
public long getInactiveKb() {
return getRamKb("Inactive");
}
/**
* Return the active memory.
*/
public long getActiveKb() {
return getRamKb("Active");
}
/**
* Return the slab memory.
*/
public long getSlabKb() {
return getRamKb("Slab");
}
/**
* Convert KB to MB.
*/
public static double kbToMb(long kb) {
return kb / 1E3;
}
/**
* Calculates amount of free RAM from /proc/meminfo content by using
* MemTotal - (Active + 0.3*InActive + 0.8*Slab) formula.
* Assumption here is that we allow Blaze to use all memory except when
* used by active pages, 30% of the inactive pages (since they may become
* active at any time) and 80% of memory used by kernel slab heap (since we
* want to keep most of the slab heap in the memory but do not want it to
* consume all available free memory).
*/
public long getFreeRamKb() {
return getTotalKb() - getActiveKb() - (long)(getInactiveKb() * 0.3) - (long)(getSlabKb() * 0.8);
}
}
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