Motivation:
We should submit multiple IO ops at once to reduce the syscall overhead.
Modifications:
- Submit multiple IO ops in batches
- Adjust default ringsize
Result:
Much better performance
Motivation:
We should only reset the RecvByteBufAllocator.Handle when a new "read
loop" starts. Otherwise the handle will not be able to correctly limit
reads.
Modifications:
- Move reset(...) call into pollIn(...)
- Remove all @Ignore
Result:
The whole testsuite passes
Motivation:
To ensure we use the correct values when passing values from Java to C and the other way around it is better to use JNI to lookup the values.
Modifications:
Add NativeStaticallyRefererencedJniMethods and use it (just as we do in kqueue / epoll)
Results:
More robust code
Motivation:
We need to cache the localAddress after the connect was complete
Modifications:
- Call socket.localAddress() after the connect was complete
- Enable test again
Result:
Correctly set localAddress after connect was successful
Motivation:
CompositeByteBuf need some special handling as well as we have multiple buffers wrapped that needs to be written via writev.
Modification:
Also handle ByteBuf with more then one nioBuffer special.
Result:
Writing CompositeByteBuf works
Motivation:
Sometimes accept failed as we not correctly set the active variable when constructing the server channel. This lead to the situation that we tried to add POLLIN before the channel become active and so tried to call accept before it was listen.
Modifications:
- Use the correct constructor
- Cleanup
Result:
No more accept failures.
Motivation:
Due a bug we did not include the IOURING based transport for clients in the testsuite. When enabling this it failed due a bug related to when we register POLLRDHUP.
Modification:
- Include IOURING clients in testsuite
- Register for RDHUP on the right time
Result:
Correctly handle RDHUP and also test IOURING for clients
Motivation:
segmentation is caused in IovecArrayPool.release because the default of iovecMemoryAddress is 0
Modification:
-set default to -1
-some cleanups
-added new testsuite tests
Result:
fixed segmentation error
Motivation:
We not correctly handled errors and also had some problems with home POLL* was handled.
Modifictions:
- Cleanup
- No need to for links anymore
- Add error handling for most operations (poll still missing)
- Add better handling for RDHUP
- Correctly handle writeScheduled flag for writev
Result:
Cleaner and more correct code
Motivation:
writev which allows to write data into multiple buffers
Modification:
-Added iovec array pool to manage iov memory
-flush override to make sure that write is not called
Result:
performance is much better
Motivation:
we should remove pollIn link, as we don't use pollIn linking anymore
Modification:
-some cleanups in the tests and in IOUring
-pollIn linking was removed
Result:
clean code
Motivation:
We must correctly use the polling support of io_uring to reduce the number of events in flight + only allocate buffers if really needed. For this we should respect the different poll masks and only do the corresponding IO action once the fd becomes ready for it.
Modification:
- Correctly respect poll masks and so only schedule an IO event if the fd is ready for it
- Move some code for cleanup
Result:
More correct usage of io_uring and less memory usage
Motivation:
if connect returns EINPROGRESS we send POLL OUT and check
via socket.finishConnect if the connection is successful
Modifications:
-added new io_uring connect op
-use a directbuffer for the socket address
Result:
you are able to connect to a peer
Motivation:
when you submit a poll, io_uring still hold reference to it even if close is called
source io_uring mailing list(https://lore.kernel.org/io-uring/27657840-4E8E-422D-93BB-7F485F21341A@kernel.dk/T/#t)
Modification:
-To delete fd reference in io_uring, we use POLL_REMOVE to avoid a server socket address error
-Added a POLL_REMOVE test
Result:
server can be closed and restarted
Motivation:
We did create a lot of objects related to the completion queue and submission queue which produced a lot of GC. Beside this we also did maintain an extra map which is not really needed as we can encode everything that we need in the user_data field.
Modification:
- Reduce complexity and GC pressure by store needed informations in the user_data field
- Small refactoring of the code to move channel related logic to the channel
- Remove unused classes
- Use callback to process stuff in the completion queue and so remove all GC created by it
- Simplify by not storing channel and buffer in the event
Result:
Less GC pressure and no extra lookups for events needed
Motivation:
-at the moment we dont shutdown when we get a read error message
-missing autoread support
Modifications:
-even if autoread is disable, should do check if the read event is already submitted
-added new Handle exception method to shutdown the channels
Result:
EL read event can handle read errors
Motivation:
no checks for non writeable sockets
Modifications:
-Added a linked write poll to make sure that the socket does not write if it is not writeable
-Added a new boolean to avoid to submit a second write operation
Result:
writeable socket check
Motivation:
to shutdown child channels we should create new abstact client class instead of using AbstractIOUringChannel
Modifications:
-Added new child channel abstract class
-Add shutdown methods to close a channel when the connection is lost
Result:
the channels can be closed when the connection is lost
Motivation:
some tcp options (like TcpFastopen or TcpFastopenConnect etc.) are required for testsuite tests
Modification:
-copied the class LinuxSocket from epoll and JNI to load this module in io_uring jni
-some configurations have been adjusted
Result:
more tcp options are available
Motivation:
The problem is that if io_uring accept/read non blocking doesnt return -EAGAIN for non-blocking sockets
in general, then it removes a way for the application to tell if
there's ever any data there.
There is a fix in Kernel 5.8 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v5.8&id=e697deed834de15d2322d0619d51893022c90ea2 which means we need to add poll before the accept/read event(poll<link>read/accept) to fix in netty as well
Modification:
-add poll before the accept/read event with this flag IOSQE_IO_LINK
Result:
netty prototype works on Kernel 5.8
Motivation:
unnecessary use of LinuxSocket class, missing CRLF etc.
Modification:
-Add CRLF
-remove IOUringChannelConfig and LinuxSocket class
Result:
less code and cleanup
Motivation:
fix checkstyle errors and many classes are unnecessarily public
Modification:
-fixed maven checkstyle errors
-using package-private and final classes
Result:
better code quality
Motivation:
missing eventLoop completionQueue logic
Modification:
-mapping between channel and eventloop
-added new prototype blocking example
Result:
First running prototype
Motivation:
-missing channel configs
-we dont store byteBuf and channel for the read operation to execute channel.fireChannelReadComplete
Modifications:
-add channels configs
-new Event properties for the processing completionQueue
Result:
with these changes it will be much easier to implement the eventloop
Motivation:
JNI ring buffer implementation is inflexible and not really efficient
Modifications:
-RingBuffer instance is created in JNI which contains io_uring ring buffer information
-move the JNI ring buffer logic to Java
-added Todos
-using unsafe memory barriers loadFence and storeFence
-revert epoll file
Result:
this java ring buffer implementation is more flexible and efficient
Motivation:
prototype is not buildable and JNI io_uring implementation is missing
Modifications:
-added io_uring implementation(source from https://github.com/axboe/liburing)
-eventloop stores netty io_uring pointer which is used for two ring buffers to execute events like read and write operations in JNI
-memory barriers already included in JNI(will be changed in the future)
-pom file adopted from native epoll
Result:
prototype can finally be built
