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8337199: Add jcmd Thread.vthread_scheduler and Thread.vthread_pollers diagnostic commands

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Reviewed-by: dholmes, kevinw
This commit is contained in:
Alan Bateman 2024-12-03 07:24:46 +00:00
parent 3eb5461578
commit 5c8cb2edcb
11 changed files with 383 additions and 12 deletions
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30
src/java.base/share/classes/sun/nio/ch/Poller.java
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@ -36,6 +36,7 @@ import java.util.concurrent.ThreadFactory;
import java.util.concurrent.locks.LockSupport;
import java.util.function.BooleanSupplier;
import jdk.internal.misc.InnocuousThread;
import jdk.internal.vm.annotation.Stable;
/**
* Polls file descriptors. Virtual threads invoke the poll method to park
@ -53,6 +54,9 @@ public abstract class Poller {
}
}
// the poller or sub-poller thread
private @Stable Thread owner;
// maps file descriptors to parked Thread
private final Map<Integer, Thread> map = new ConcurrentHashMap<>();
@ -238,6 +242,7 @@ public abstract class Poller {
* descriptor that is polled.
*/
private void pollerLoop() {
owner = Thread.currentThread();
try {
for (;;) {
poll(-1);
@ -258,6 +263,7 @@ public abstract class Poller {
*/
private void subPollerLoop(Poller masterPoller) {
assert Thread.currentThread().isVirtual();
owner = Thread.currentThread();
try {
int polled = 0;
for (;;) {
@ -282,7 +288,8 @@ public abstract class Poller {
@Override
public String toString() {
return Objects.toIdentityString(this) + " [registered = " + registered() + "]";
return String.format("%s [registered = %d, owner = %s]",
Objects.toIdentityString(this), registered(), owner);
}
/**
@ -442,4 +449,25 @@ public abstract class Poller {
}
}
}
/**
* Return the master poller or null if there is no master poller.
*/
public static Poller masterPoller() {
return POLLERS.masterPoller();
}
/**
* Return the list of read pollers.
*/
public static List<Poller> readPollers() {
return POLLERS.readPollers();
}
/**
* Return the list of write pollers.
*/
public static List<Poller> writePollers() {
return POLLERS.writePollers();
}
}