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// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
//
package com.yahoo.vespa.hosted.node.admin.container;
import com.yahoo.vespa.hosted.node.admin.nodeagent.NodeAgentContext;
import com.yahoo.vespa.hosted.node.admin.task.util.file.UnixPath;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.FileSystem;
import java.nio.file.Files;
import java.nio.file.NoSuchFileException;
import java.nio.file.Path;
import java.util.OptionalInt;
import java.util.logging.Logger;
/**
* Read and write interface to the v1 cgroup of a podman container.
* See <a href="https://man7.org/linux/man-pages/man7/cgroups.7.html">cgroups(7)</a> for background.
*
* @author hakon
*/
public class Cgroup {
private static final Logger logger = Logger.getLogger(Cgroup.class.getName());
private final FileSystem fileSystem;
private final ContainerId containerId;
public Cgroup(FileSystem fileSystem, ContainerId containerId) {
this.fileSystem = fileSystem;
this.containerId = containerId;
}
public OptionalInt readCpuQuota() {
return readCgroupsCpuInt(cfsQuotaPath());
}
public OptionalInt readCpuPeriod() {
return readCgroupsCpuInt(cfsPeriodPath());
}
public OptionalInt readCpuShares() {
return readCgroupsCpuInt(sharesPath());
}
public boolean updateCpuQuota(NodeAgentContext context, int cpuQuotaUs) {
return writeCgroupsCpuInt(context, cfsQuotaPath(), cpuQuotaUs);
}
public boolean updateCpuPeriod(NodeAgentContext context, int periodUs) {
return writeCgroupsCpuInt(context, cfsPeriodPath(), periodUs);
}
public boolean updateCpuShares(NodeAgentContext context, int shares) {
return writeCgroupsCpuInt(context, sharesPath(), shares);
}
/** Returns the path to the podman container's scope directory for the cpuacct controller. */
public Path cpuacctPath() {
return fileSystem.getPath("/sys/fs/cgroup/cpuacct/machine.slice/libpod-" + containerId + ".scope");
}
/** Returns the path to the podman container's scope directory for the cpu controller. */
public Path cpuPath() {
return fileSystem.getPath("/sys/fs/cgroup/cpu/machine.slice/libpod-" + containerId + ".scope");
}
/** Returns the path to the podman container's scope directory for the memory controller. */
public Path memoryPath() {
return fileSystem.getPath("/sys/fs/cgroup/memory/machine.slice/libpod-" + containerId + ".scope");
}
private UnixPath cfsQuotaPath() {
return new UnixPath(cpuPath().resolve("cpu.cfs_quota_us"));
}
private UnixPath cfsPeriodPath() {
return new UnixPath(cpuPath().resolve("cpu.cfs_period_us"));
}
private UnixPath sharesPath() {
return new UnixPath(cpuPath().resolve("cpu.shares"));
}
private OptionalInt readCgroupsCpuInt(UnixPath unixPath) {
final byte[] currentContentBytes;
try {
currentContentBytes = Files.readAllBytes(unixPath.toPath());
} catch (NoSuchFileException e) {
return OptionalInt.empty();
} catch (IOException e) {
throw new UncheckedIOException(e);
}
String currentContent = new String(currentContentBytes, StandardCharsets.UTF_8).strip();
return OptionalInt.of(Integer.parseInt(currentContent));
}
private boolean writeCgroupsCpuInt(NodeAgentContext context, UnixPath unixPath, int value) {
int currentValue = readCgroupsCpuInt(unixPath).orElseThrow();
if (currentValue == value) {
return false;
}
context.recordSystemModification(logger, "Updating " + unixPath + " from " + currentValue + " to " + value);
unixPath.writeUtf8File(Integer.toString(value));
return true;
}
}
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