48 lines
5.2 KiB
Markdown
48 lines
5.2 KiB
Markdown
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# JVM
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## JVM Attributes
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This document defines Java Virtual machine related attributes.
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| Attribute | Type | Description | Examples | Stability |
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| ---------------------- | ------- | ----------------------------------------- | -------------------------------------------------- | ---------------------------------------------------------------- |
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| `jvm.buffer.pool.name` | string | Name of the buffer pool. [1] | `mapped`; `direct` |  |
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| `jvm.gc.action` | string | Name of the garbage collector action. [2] | `end of minor GC`; `end of major GC` |  |
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| `jvm.gc.name` | string | Name of the garbage collector. [3] | `G1 Young Generation`; `G1 Old Generation` |  |
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| `jvm.memory.pool.name` | string | Name of the memory pool. [4] | `G1 Old Gen`; `G1 Eden space`; `G1 Survivor Space` |  |
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| `jvm.memory.type` | string | The type of memory. | `heap`; `non_heap` |  |
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| `jvm.thread.daemon` | boolean | Whether the thread is daemon or not. | |  |
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| `jvm.thread.state` | string | State of the thread. | `runnable`; `blocked` |  |
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**[1]:** Pool names are generally obtained via [BufferPoolMXBean#getName()](<https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/BufferPoolMXBean.html#getName()>).
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**[2]:** Garbage collector action is generally obtained via [GarbageCollectionNotificationInfo#getGcAction()](<https://docs.oracle.com/en/java/javase/11/docs/api/jdk.management/com/sun/management/GarbageCollectionNotificationInfo.html#getGcAction()>).
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**[3]:** Garbage collector name is generally obtained via [GarbageCollectionNotificationInfo#getGcName()](<https://docs.oracle.com/en/java/javase/11/docs/api/jdk.management/com/sun/management/GarbageCollectionNotificationInfo.html#getGcName()>).
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**[4]:** Pool names are generally obtained via [MemoryPoolMXBean#getName()](<https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html#getName()>).
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`jvm.memory.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.
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| Value | Description | Stability |
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| ---------- | --------------- | ---------------------------------------------------------- |
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| `heap` | Heap memory. |  |
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| `non_heap` | Non-heap memory |  |
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`jvm.thread.state` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.
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| Value | Description | Stability |
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| --------------- | --------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------- |
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| `new` | A thread that has not yet started is in this state. |  |
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| `runnable` | A thread executing in the Java virtual machine is in this state. |  |
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| `blocked` | A thread that is blocked waiting for a monitor lock is in this state. |  |
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| `waiting` | A thread that is waiting indefinitely for another thread to perform a particular action is in this state. |  |
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| `timed_waiting` | A thread that is waiting for another thread to perform an action for up to a specified waiting time is in this state. |  |
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| `terminated` | A thread that has exited is in this state. |  |
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