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/*
 * Copyright (c) 2018, 2020, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */

package jdk.internal.platform;

/**
 *
 * Cgroup v1 extensions to the Metrics interface. Linux, only.
 *
 */
public interface CgroupV1Metrics extends Metrics {

    /**
     * Returns the largest amount of physical memory, in bytes, that
     * have been allocated in the Isolation Group.
     *
     * @return The largest amount of memory in bytes or -1 if this
     *         metric is not available. Returns -2 if this metric is not
     *         supported.
     *
     */
    public long getMemoryMaxUsage();

    /**
     * Returns the number of times that kernel memory requests in the
     * Isolation Group have exceeded the kernel memory limit.
     *
     * @return The number of exceeded requests or -1 if metric
     *         is not available.
     *
     */
    public long getKernelMemoryFailCount();

    /**
     * Returns the maximum amount of kernel physical memory, in bytes, that
     * can be allocated in the Isolation Group.
     *
     * @return The maximum amount of memory in bytes or -1 if
     *         there is no limit set.
     *
     */
    public long getKernelMemoryLimit();

    /**
     * Returns the largest amount of kernel physical memory, in bytes, that
     * have been allocated in the Isolation Group.
     *
     * @return The largest amount of memory in bytes or -1 if this
     *         metric is not available.
     *
     */
    public long getKernelMemoryMaxUsage();

    /**
     * Returns the amount of kernel physical memory, in bytes, that
     * is currently allocated in the current Isolation Group.
     *
     * @return The amount of memory in bytes allocated or -1 if this
     *         metric is not available.
     *
     */
    public long getKernelMemoryUsage();

    /**
     * Returns the number of times that networking memory requests in the
     * Isolation Group have exceeded the kernel memory limit.
     *
     * @return The number of exceeded requests or -1 if the metric
     *         is not available.
     *
     */
    public long getTcpMemoryFailCount();

    /**
     * Returns the maximum amount of networking physical memory, in bytes,
     * that can be allocated in the Isolation Group.
     *
     * @return The maximum amount of memory in bytes or -1 if
     *         there is no limit.
     *
     */
    public long getTcpMemoryLimit();

    /**
     * Returns the largest amount of networking physical memory, in bytes,
     * that have been allocated in the Isolation Group.
     *
     * @return The largest amount of memory in bytes or -1 if this
     *         metric is not available.
     *
     */
    public long getTcpMemoryMaxUsage();

    /**
     * Returns the number of times that user memory requests in the
     * Isolation Group have exceeded the memory + swap limit.
     *
     * @return The number of exceeded requests or -1 if the metric
     *         is not available.
     *
     */
    public long getMemoryAndSwapFailCount();

    /**
     * Returns the largest amount of physical memory and swap space,
     * in bytes, that have been allocated in the Isolation Group.
     *
     * @return The largest amount of memory in bytes or -1 if this
     *         metric is not available.
     *
     */
    public long getMemoryAndSwapMaxUsage();

    /**
     * Returns the state of the Operating System Out of Memory termination
     * policy.
     *
     * @return Returns true if operating system will terminate processes
     *         in the Isolation Group that exceed the amount of available
     *         memory, otherwise false. null will be returned if this
     *         capability is not available on the current operating system.
     *
     */
    public Boolean isMemoryOOMKillEnabled();

    /**
     * Returns the (attempts per second * 1000), if enabled, that the
     * operating system tries to satisfy a memory request for any
     * process in the current Isolation Group when no free memory is
     * readily available.  Use {@link #isCpuSetMemoryPressureEnabled()} to
     * determine if this support is enabled.
     *
     * @return Memory pressure or 0 if not enabled or -1 if metric is not
     *         available.
     *
     */
    public double getCpuSetMemoryPressure();

    /**
     * Returns the state of the memory pressure detection support.
     *
     * @return true if support is available and enabled. false otherwise.
     *
     */
    public Boolean isCpuSetMemoryPressureEnabled();
}