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8318422: Allow poller threads be virtual threads

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Reviewed-by: michaelm
This commit is contained in:
Alan Bateman 2023-11-04 06:52:19 +00:00
parent 29cf2c471b
commit c099cf53f2
13 changed files with 368 additions and 399 deletions
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30
src/java.base/linux/classes/sun/nio/ch/DefaultPollerProvider.java
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2017, 2022, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2017, 2023, 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
@ -25,6 +25,7 @@
package sun.nio.ch;
import java.io.IOException;
import jdk.internal.vm.ContinuationSupport;
/**
* Default PollerProvider for Linux.
@ -33,12 +34,31 @@ class DefaultPollerProvider extends PollerProvider {
DefaultPollerProvider() { }
@Override
Poller readPoller() throws IOException {
return new EPollPoller(true);
Poller.Mode defaultPollerMode() {
if (ContinuationSupport.isSupported()) {
return Poller.Mode.VTHREAD_POLLERS;
} else {
return Poller.Mode.SYSTEM_THREADS;
}
}
@Override
Poller writePoller() throws IOException {
return new EPollPoller(false);
int defaultReadPollers(Poller.Mode mode) {
int ncpus = Runtime.getRuntime().availableProcessors();
if (mode == Poller.Mode.VTHREAD_POLLERS) {
return Math.min(Integer.highestOneBit(ncpus), 32);
} else {
return Math.max(Integer.highestOneBit(ncpus / 4), 1);
}
}
@Override
Poller readPoller(boolean subPoller) throws IOException {
return new EPollPoller(subPoller, true);
}
@Override
Poller writePoller(boolean subPoller) throws IOException {
return new EPollPoller(subPoller, false);
}
}

10
src/java.base/linux/classes/sun/nio/ch/EPollPoller.java
View file

@ -32,18 +32,18 @@ import static sun.nio.ch.EPoll.*;
*/
class EPollPoller extends Poller {
private static final int MAX_EVENTS_TO_POLL = 512;
private static final int ENOENT = 2;
private final int epfd;
private final int event;
private final int maxEvents;
private final long address;
EPollPoller(boolean read) throws IOException {
super(read);
EPollPoller(boolean subPoller, boolean read) throws IOException {
this.epfd = EPoll.create();
this.event = (read) ? EPOLLIN : EPOLLOUT;
this.address = EPoll.allocatePollArray(MAX_EVENTS_TO_POLL);
this.maxEvents = (subPoller) ? 64 : 512;
this.address = EPoll.allocatePollArray(maxEvents);
}
@Override
@ -68,7 +68,7 @@ class EPollPoller extends Poller {
@Override
int poll(int timeout) throws IOException {
int n = EPoll.wait(epfd, address, MAX_EVENTS_TO_POLL, timeout);
int n = EPoll.wait(epfd, address, maxEvents, timeout);
int i = 0;
while (i < n) {
long eventAddress = EPoll.getEvent(address, i);