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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+
+- Add this CHANGELOG.md file to keep track of changes.
+
+### Fixed
+
+- Don't rely on /tmp or $TMPDIR in tests.
+
+## [1.2.1] - 2022-07-25
+
+### Fixed
+
+- Set default visibility to hidden to prevent clashes with other functions such
+  as the verr() in the glibc.
+- Don't hardcore destination directory names like lib, to use the ones in the
+  destination host (like lib64).
+- Add support in ovnisort for cases where in the sorting region there are flush
+  events.
+- Remove CI nix roots from the builds to allow the garbage collector to remove
+  the build.
+- Fix the detection of the -fompss-2 flag in cmake by setting the flag at link
+  time too.
+- Fix spawn task test by waiting for the task to finish before exiting.
+
+## [1.2.0] - 2022-05-02
+
+This version adds the initial support for the breakdown view and some fixes.
+
+### Added
+
+- Add the initial breakdown view showing the task type, the subsystem or the
+  idle state.
+- Added the sort module for channels to support the breakdown view.
+- Add the -b option in ovniemu to enable the breakdown trace.
+- Add support for sponge CPUs in Nanos6.
+- Add the cmake option `-DUSE_MPI=OFF` to build ovni without MPI.
+- Add a test for two nOS-V shared memory segments.
+
+### Fixed
+
+- Sort the timeline rows in MPI rank order if given.
+- Skip duplicated entries when ovnisync to runs multiple times in the same node.
+- Allow tasks to be re-executed to support the taskiter in the nOS-V model.
+- Use the signed `int64_t` type for clock offsets, so they can be negative.
+- Avoid fmemopen() due to a bug in old glibc versions.
+- Fix clang format for braced list
+- Fix buffer overflow in `sort_replace()` of the sort module.
+- Set the size of the channel property arrays to prevent a buffer overflow.
+
+## [1.1.0] - 2022-03-24
+
+This version introduces the patch bay and a big redesign in the way the channels
+are used along with some other changes.
+
+### Changed
+
+- The channels are now connected using the patch bay, where they must be
+  registered using an unique name.
+- The tracking modes are implemented by using a mux, and an arbitrary way of
+  tracking other channels is now possible, as it is required for the breakdown
+  model.
+- The channels don't have visibility with other parts of the code, they interact
+  with a callback only.
+- The emulator code has been split into smaller modules which are independent of
+  each other, so we can unit test them separately.
+- The models are now implemented following the model spec functions.
+- Updated the ovni and Nanos6 models
+- Model data is now stored by the `extend_set`/`get` methods, so it is kept
+  separate between models.
+- The CPU and thread channels have been moved to the emulator while the ones
+  specific to the user space tracing with libovni.so are controlled by the ovni
+  model. This allows other thread/CPU tracing mechanisms (kernel events) to
+  update the emulator channels while the other models are not affected.
+- The trace streams are now independent of the hierarchy loom/proc/thread, and
+  end with the suffix .obs, so we can add other types of traces in the future.
+- Models can register any arbitrary number of channels on runtime, so we can add
+  load hardware counters in one channel each.
+- Channels have a user friendly name so debugging is easier
+- The die() abort mechanism has been transformed into if() + return -1, so we
+  can do unit testing and check the errors and also finish the PRV traces when
+  the emulator encounters an error and open them in Paraver with the last
+  processed event.
+- The emulator can be stopped with ^C, producing a valid Paraver trace.
+- Prevents leaving threads in the running state by adding a check at the end of
+  emulation
+- The Paraver configurations files are copied into the trace directory.
+
+### Removed
+
+- The TAMPI and OpenMP models have been removed as they are not maintained.
+- Punctual events are not implemented for now.
+- No error states, when more than one thread is running in the virtual
+  CPU, no subsystem is shown in the CPU view.
+
+## [1.0.0] - 2022-12-16
+
+### Added
+
+- First ovni release.
+
+[unreleased]: https://pm.bsc.es/gitlab/rarias/ovni/-/commits/master
+[1.2.1]: https://pm.bsc.es/gitlab/rarias/ovni/-/tags/1.2.1
+[1.2.0]: https://pm.bsc.es/gitlab/rarias/ovni/-/tags/1.2.0
+[1.1.0]: https://pm.bsc.es/gitlab/rarias/ovni/-/tags/1.1.0
+[1.0.0]: https://pm.bsc.es/gitlab/rarias/ovni/-/tags/1.0.0