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Factor out less common code-path into own method to allow inlining. (#8590) 

Motivation:

During benchmarks two methods showed up as "hot method too big". We can easily make these smaller by factor out some less common code-path to an extra method and so allow inlining.

Modifications:

Factor out less common code path to an extra method.

Result:

Hot methods can be inlined.
This commit is contained in:
Norman Maurer 2018-11-25 21:46:14 +01:00 committed by GitHub
parent af34287fd1
commit af63626777
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 40 additions and 26 deletions
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37
transport/src/main/java/io/netty/channel/ChannelOutboundBuffer.java
View File

@ -434,21 +434,9 @@ public final class ChannelOutboundBuffer {
}
nioBuffers[nioBufferCount++] = nioBuf;
} else {
ByteBuffer[] nioBufs = entry.bufs;
if (nioBufs == null) {
// cached ByteBuffers as they may be expensive to create in terms
// of Object allocation
entry.bufs = nioBufs = buf.nioBuffers();
}
for (int i = 0; i < nioBufs.length && nioBufferCount < maxCount; ++i) {
ByteBuffer nioBuf = nioBufs[i];
if (nioBuf == null) {
break;
} else if (!nioBuf.hasRemaining()) {
continue;
}
nioBuffers[nioBufferCount++] = nioBuf;
}
// The code exists in an extra method to ensure the method is not too big to inline as this
// branch is not very likely to get hit very frequently.
nioBufferCount = nioBuffers(entry, buf, nioBuffers, nioBufferCount, maxCount);
}
if (nioBufferCount == maxCount) {
break;
@ -463,6 +451,25 @@ public final class ChannelOutboundBuffer {
return nioBuffers;
}
private static int nioBuffers(Entry entry, ByteBuf buf, ByteBuffer[] nioBuffers, int nioBufferCount, int maxCount) {
ByteBuffer[] nioBufs = entry.bufs;
if (nioBufs == null) {
// cached ByteBuffers as they may be expensive to create in terms
// of Object allocation
entry.bufs = nioBufs = buf.nioBuffers();
}
for (int i = 0; i < nioBufs.length && nioBufferCount < maxCount; ++i) {
ByteBuffer nioBuf = nioBufs[i];
if (nioBuf == null) {
break;
} else if (!nioBuf.hasRemaining()) {
continue;
}
nioBuffers[nioBufferCount++] = nioBuf;
}
return nioBufferCount;
}
private static ByteBuffer[] expandNioBufferArray(ByteBuffer[] array, int neededSpace, int size) {
int newCapacity = array.length;
do {

29
transport/src/main/java/io/netty/channel/nio/NioEventLoop.java
View File

@ -793,17 +793,9 @@ public final class NioEventLoop extends SingleThreadEventLoop {
selectCnt = 1;
} else if (SELECTOR_AUTO_REBUILD_THRESHOLD > 0 &&
selectCnt >= SELECTOR_AUTO_REBUILD_THRESHOLD) {
// The selector returned prematurely many times in a row.
// Rebuild the selector to work around the problem.
logger.warn(
"Selector.select() returned prematurely {} times in a row; rebuilding Selector {}.",
selectCnt, selector);
rebuildSelector();
selector = this.selector;
// Select again to populate selectedKeys.
selector.selectNow();
// The code exists in an extra method to ensure the method is not too big to inline as this
// branch is not very likely to get hit very frequently.
selector = selectRebuildSelector(selectCnt);
selectCnt = 1;
break;
}
@ -826,6 +818,21 @@ public final class NioEventLoop extends SingleThreadEventLoop {
}
}
private Selector selectRebuildSelector(int selectCnt) throws IOException {
// The selector returned prematurely many times in a row.
// Rebuild the selector to work around the problem.
logger.warn(
"Selector.select() returned prematurely {} times in a row; rebuilding Selector {}.",
selectCnt, selector);
rebuildSelector();
Selector selector = this.selector;
// Select again to populate selectedKeys.
selector.selectNow();
return selector;
}
private void selectAgain() {
needsToSelectAgain = false;
try {