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src/java.base/share/classes/jdk/internal/platform/Metrics.java
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@ rev 57734 : Review feedback
|
o rev 57733 : 8231111: Cgroups v2: Rework Metrics in java.base so as to recognize unified hierarchy
| Reviewed-by: bobv, mchung
~
o rev 56862 : 8231111: Cgroups v2: Rework Metrics in java.base so as to recognize unified hierarchy
| Reviewed-by: bobv
~
*** 1,7 ****
/*
! * Copyright (c) 2018, 2019, 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
--- 1,7 ----
/*
! * 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
*** 54,66 ****
*
* @return Metrics object or null if not supported on this platform.
*/
public static Metrics systemMetrics() {
try {
! // We currently only support cgroupv1
! Class<?> c = Class.forName("jdk.internal.platform.cgroupv1.Metrics");
! @SuppressWarnings("unchecked")
Method m = c.getMethod("getInstance");
return (Metrics) m.invoke(null);
} catch (ClassNotFoundException e) {
return null;
} catch (ReflectiveOperationException e) {
--- 54,64 ----
*
* @return Metrics object or null if not supported on this platform.
*/
public static Metrics systemMetrics() {
try {
! Class<?> c = Class.forName("jdk.internal.platform.CgroupMetrics");
Method m = c.getMethod("getInstance");
return (Metrics) m.invoke(null);
} catch (ClassNotFoundException e) {
return null;
} catch (ReflectiveOperationException e) {
*** 72,82 ****
* Returns the interface responsible for providing the
* platform metrics.
*
* @implNote
* Metrics are currently only supported Linux.
! * The provider for Linux is cgroupsv1.
*
* @return The name of the provider.
*
*/
public String getProvider();
--- 70,80 ----
* Returns the interface responsible for providing the
* platform metrics.
*
* @implNote
* Metrics are currently only supported Linux.
! * The provider for Linux is cgroups (version 1 or 2).
*
* @return The name of the provider.
*
*/
public String getProvider();
*** 88,98 ****
/**
* Returns the aggregate time, in nanoseconds, consumed by all
* tasks in the Isolation Group.
*
! * @return Time in nanoseconds or 0L if metric is not available.
*
*/
public long getCpuUsage();
/**
--- 86,97 ----
/**
* Returns the aggregate time, in nanoseconds, consumed by all
* tasks in the Isolation Group.
*
! * @return Time in nanoseconds, -1 if unknown or
! * -2 if the metric is not supported.
*
*/
public long getCpuUsage();
/**
*** 104,133 ****
* on the system. Time values for processors unavailable to this
* Group are undefined.
*
* @return long array of time values. The size of the array is equal
* to the total number of physical processors in the system. If
! * this metric is not available, a zero length array will be
* returned.
*
*/
public long[] getPerCpuUsage();
/**
* Returns the aggregate user time, in nanoseconds, consumed by all
* tasks in the Isolation Group.
*
! * @return User time in nanoseconds or 0L if metric is not available.
*
*/
public long getCpuUserUsage();
/**
* Returns the aggregate system time, in nanoseconds, consumed by
* all tasks in the Isolation Group.
*
! * @return System time in nanoseconds or 0L if metric is not available.
*
*/
public long getCpuSystemUsage();
/*****************************************************************
--- 103,134 ----
* on the system. Time values for processors unavailable to this
* Group are undefined.
*
* @return long array of time values. The size of the array is equal
* to the total number of physical processors in the system. If
! * this metric is not supported or not available, null will be
* returned.
*
*/
public long[] getPerCpuUsage();
/**
* Returns the aggregate user time, in nanoseconds, consumed by all
* tasks in the Isolation Group.
*
! * @return User time in nanoseconds, -1 if the metric is not available or
! * -2 if the metric is not supported.
*
*/
public long getCpuUserUsage();
/**
* Returns the aggregate system time, in nanoseconds, consumed by
* all tasks in the Isolation Group.
*
! * @return System time in nanoseconds, -1 if the metric is not available or
! * -2 if the metric is not supported.
*
*/
public long getCpuSystemUsage();
/*****************************************************************
*** 136,156 ****
/**
* Returns the length of the scheduling period, in
* microseconds, for processes within the Isolation Group.
*
! * @return time in microseconds or 0L if metric is not available.
*
*/
public long getCpuPeriod();
/**
* Returns the total available run-time allowed, in microseconds,
* during each scheduling period for all tasks in the Isolation
* Group.
*
! * @return time in microseconds or -1 if the quota is unlimited.
*
*/
public long getCpuQuota();
--- 137,159 ----
/**
* Returns the length of the scheduling period, in
* microseconds, for processes within the Isolation Group.
*
! * @return time in microseconds, -1 if the metric is not available or
! * -2 if the metric is not supported.
*
*/
public long getCpuPeriod();
/**
* Returns the total available run-time allowed, in microseconds,
* during each scheduling period for all tasks in the Isolation
* Group.
*
! * @return time in microseconds, -1 if the quota is unlimited or
! * -2 if not supported.
*
*/
public long getCpuQuota();
*** 165,205 ****
* of execution. Users can distribute CPU resources to multiple
* Isolation Groups by specifying the CPU share weighting needed by
* each process. To request 2 CPUS worth of execution time, CPU shares
* would be set to 2048.
*
! * @return shares value or -1 if no share set.
*
*/
public long getCpuShares();
/**
* Returns the number of time-slice periods that have elapsed if
! * a CPU quota has been setup for the Isolation Group; otherwise
! * returns 0.
*
! * @return count of elapsed periods or 0 if the quota is unlimited.
*
*/
public long getCpuNumPeriods();
/**
* Returns the number of time-slice periods that the group has
* been throttled or limited due to the group exceeding its quota
* if a CPU quota has been setup for the Isolation Group.
*
! * @return count of throttled periods or 0 if the quota is unlimited.
*
*/
public long getCpuNumThrottled();
/**
* Returns the total time duration, in nanoseconds, that the
* group has been throttled or limited due to the group exceeding
* its quota if a CPU quota has been setup for the Isolation Group.
*
! * @return Throttled time in nanoseconds or 0 if the quota is unlimited.
*
*/
public long getCpuThrottledTime();
--- 168,211 ----
* of execution. Users can distribute CPU resources to multiple
* Isolation Groups by specifying the CPU share weighting needed by
* each process. To request 2 CPUS worth of execution time, CPU shares
* would be set to 2048.
*
! * @return shares value, -1 if the metric is not available or
! * -2 if cpu shares are not supported.
*
*/
public long getCpuShares();
/**
* Returns the number of time-slice periods that have elapsed if
! * a CPU quota has been setup for the Isolation Group
*
! * @return count of elapsed periods, -1 if the metric is not available
! * or -2 if the metric is not supported.
*
*/
public long getCpuNumPeriods();
/**
* Returns the number of time-slice periods that the group has
* been throttled or limited due to the group exceeding its quota
* if a CPU quota has been setup for the Isolation Group.
*
! * @return count of throttled periods, -1 if the metric is not available or
! * -2 if it is not supported.
*
*/
public long getCpuNumThrottled();
/**
* Returns the total time duration, in nanoseconds, that the
* group has been throttled or limited due to the group exceeding
* its quota if a CPU quota has been setup for the Isolation Group.
*
! * @return Throttled time in nanoseconds, -1 if the metric is not available
! * or -2 if it is not supported.
*
*/
public long getCpuThrottledTime();
*** 227,250 ****
* to the total number of CPUs and the elements in the array are the
* physical CPU numbers that are available. Some of the CPUs returned
* may be offline. To get the current online CPUs, use
* {@link getEffectiveCpuSetCpus()}.
*
! * @return An array of available CPUs or a zero length array
! * if the metric is not available.
*
*/
public int[] getCpuSetCpus();
/**
* Returns the CPUS that are available and online for execution of
* processes within the current Isolation Group. The size of the
* array is equal to the total number of CPUs and the elements in
* the array are the physical CPU numbers.
*
! * @return An array of available and online CPUs or a zero length
! * array if the metric is not available.
*
*/
public int[] getEffectiveCpuSetCpus();
/**
--- 233,256 ----
* to the total number of CPUs and the elements in the array are the
* physical CPU numbers that are available. Some of the CPUs returned
* may be offline. To get the current online CPUs, use
* {@link getEffectiveCpuSetCpus()}.
*
! * @return An array of available CPUs. Returns null if the metric is not
! * available or the metric is not supported.
*
*/
public int[] getCpuSetCpus();
/**
* Returns the CPUS that are available and online for execution of
* processes within the current Isolation Group. The size of the
* array is equal to the total number of CPUs and the elements in
* the array are the physical CPU numbers.
*
! * @return An array of available and online CPUs. Returns null
! * if the metric is not available or the metric is not supported.
*
*/
public int[] getEffectiveCpuSetCpus();
/**
*** 253,487 ****
* to the total number of nodes and the elements in the array are the
* physical node numbers that are available. Some of the nodes returned
* may be offline. To get the current online memory nodes, use
* {@link getEffectiveCpuSetMems()}.
*
! * @return An array of available memory nodes or a zero length array
! * if the metric is not available.
*
*/
public int[] getCpuSetMems();
/**
* Returns the memory nodes that are available and online for use by
* processes within the current Isolation Group. The size of the
* array is equal to the total number of nodes and the elements in
* the array are the physical node numbers.
*
! * @return An array of available and online nodes or a zero length
! * array if the metric is not available.
*
*/
public int[] getEffectiveCpuSetMems();
- /**
- * 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 metric is not
- * available.
- *
- */
- public double getCpuSetMemoryPressure();
-
- /**
- * Returns the state of the memory pressure detection support.
- *
- * @return true if the support is available and enabled, otherwise false.
- *
- */
- public boolean isCpuSetMemoryPressureEnabled();
-
/*****************************************************************
* Memory Subsystem
****************************************************************/
/**
* Returns the number of times that user memory requests in the
* Isolation Group have exceeded the memory limit.
*
! * @return The number of exceeded requests or 0 if none or metric
! * is not available.
*
*/
public long getMemoryFailCount();
/**
* Returns the maximum amount of physical memory, in bytes, that
* can be allocated in the Isolation Group.
*
! * @return The maximum amount of memory in bytes or -1 if either
! * there is no limit set or this metric is not available.
*
*/
public long getMemoryLimit();
/**
- * 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 0 if this
- * metric is not available.
- *
- */
- public long getMemoryMaxUsage();
-
- /**
* Returns the amount of physical memory, in bytes, that is currently
* allocated in the current Isolation Group.
*
! * @return The amount of memory in bytes allocated or 0 if this
! * metric is not available.
*
*/
public long getMemoryUsage();
/**
- * 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 0 if none or 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 either
- * there is no limit set or this metric is not available.
- *
- */
- 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 0 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 0 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 0 if none or 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 either
- * there is no limit set or this metric is not available.
- *
- */
- 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 0 if this
- * metric is not available.
- *
- */
- public long getTcpMemoryMaxUsage();
-
- /**
* Returns the amount of networking physical memory, in bytes, that
* is currently allocated in the current Isolation Group.
*
! * @return The amount of memory in bytes allocated or 0 if this
! * metric is not available.
*
*/
public long getTcpMemoryUsage();
/**
- * 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 0 if none or metric
- * is not available.
- *
- */
- public long getMemoryAndSwapFailCount();
-
- /**
* Returns the maximum amount of physical memory and swap space,
* in bytes, that can be allocated in the Isolation Group.
*
! * @return The maximum amount of memory in bytes or -1 if either
! * there is no limit set or this metric is not available.
*
*/
public long getMemoryAndSwapLimit();
/**
- * 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 0 if this
- * metric is not available.
- *
- */
- public long getMemoryAndSwapMaxUsage();
-
- /**
* Returns the amount of physical memory and swap space, in bytes,
* that is currently allocated in the current Isolation Group.
*
! * @return The amount of memory in bytes allocated or 0 if this
! * metric is not available.
*
*/
public long getMemoryAndSwapUsage();
/**
- * 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. Flase will be returned if this
- * capability is not available on the current operating system.
- *
- */
- public boolean isMemoryOOMKillEnabled();
-
- /**
* Returns the hint to the operating system that allows groups
* to specify the minimum amount of physical memory that they need to
* achieve reasonable performance in low memory systems. This allows
* host systems to provide greater sharing of memory.
*
* @return The minimum amount of physical memory, in bytes, that the
* operating system will try to maintain under low memory
! * conditions. If this metric is not available, 0 will be
! * returned.
*
*/
public long getMemorySoftLimit();
/*****************************************************************
--- 259,363 ----
* to the total number of nodes and the elements in the array are the
* physical node numbers that are available. Some of the nodes returned
* may be offline. To get the current online memory nodes, use
* {@link getEffectiveCpuSetMems()}.
*
! * @return An array of available memory nodes or null
! * if the metric is not available or is not supported.
*
*/
public int[] getCpuSetMems();
/**
* Returns the memory nodes that are available and online for use by
* processes within the current Isolation Group. The size of the
* array is equal to the total number of nodes and the elements in
* the array are the physical node numbers.
*
! * @return An array of available and online nodes or null
! * if the metric is not available or is not supported.
*
*/
public int[] getEffectiveCpuSetMems();
/*****************************************************************
* Memory Subsystem
****************************************************************/
/**
* Returns the number of times that user memory requests in the
* Isolation Group have exceeded the memory limit.
*
! * @return The number of exceeded requests or -1 if the metric
! * is not available. Returns -2 if the metric is not
! * supported.
*
*/
public long getMemoryFailCount();
/**
* Returns the maximum amount of 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 or -2 if this metric is not supported.
*
*/
public long getMemoryLimit();
/**
* Returns the amount of physical memory, in bytes, that is currently
* allocated in the current Isolation Group.
*
! * @return The amount of memory in bytes allocated or -1 if
! * the metric is not available or -2 if the metric is not
! * supported.
*
*/
public long getMemoryUsage();
/**
* Returns the amount of networking physical memory, in bytes, that
* is currently allocated in the current Isolation Group.
*
! * @return The amount of memory in bytes allocated or -1 if the metric
! * is not available. Returns -2 if this metric is not supported.
*
*/
public long getTcpMemoryUsage();
/**
* Returns the maximum amount of physical memory and swap space,
* 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 or -2 if this metric is not supported.
*
*/
public long getMemoryAndSwapLimit();
/**
* Returns the amount of physical memory and swap space, in bytes,
* that is currently allocated in the current Isolation Group.
*
! * @return The amount of memory in bytes allocated or -1 if
! * the metric is not available. Returns -2 if this metric is not
! * supported.
*
*/
public long getMemoryAndSwapUsage();
/**
* Returns the hint to the operating system that allows groups
* to specify the minimum amount of physical memory that they need to
* achieve reasonable performance in low memory systems. This allows
* host systems to provide greater sharing of memory.
*
* @return The minimum amount of physical memory, in bytes, that the
* operating system will try to maintain under low memory
! * conditions. If this metric is not available, -1 will be
! * returned. Returns -2 if the metric is not supported.
*
*/
public long getMemorySoftLimit();
/*****************************************************************
*** 490,508 ****
/**
* Returns the number of block I/O requests to the disk that have been
* issued by the Isolation Group.
*
! * @return The count of requests or 0 if this metric is not available.
*
*/
public long getBlkIOServiceCount();
/**
* Returns the number of block I/O bytes that have been transferred
* to/from the disk by the Isolation Group.
*
! * @return The number of bytes transferred or 0 if this metric is not available.
*
*/
public long getBlkIOServiced();
}
--- 366,386 ----
/**
* Returns the number of block I/O requests to the disk that have been
* issued by the Isolation Group.
*
! * @return The count of requests or -1 if the metric is not available.
! * Returns -2 if this metric is not supported.
*
*/
public long getBlkIOServiceCount();
/**
* Returns the number of block I/O bytes that have been transferred
* to/from the disk by the Isolation Group.
*
! * @return The number of bytes transferred or -1 if the metric is not
! * available. Returns -2 if this metric is not supported.
*
*/
public long getBlkIOServiced();
}
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