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misc: Update RELEASE-NOTES.md for v21.1.0.0

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Change-Id: Ic58a7a21afe39df7792c2107de05a7058f592c90
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/48585
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
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Bobby R. Bruce
2021-07-21 16:03:06 -07:00
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RELEASE-NOTES.md
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# Version 21.1.0.0
Since v21.0 we have received 780 commits with 48 unique contributors, closing 64 issues on our [Jira Issue Tracker](https://gem5.atlassian.net/).
In addition to our [first gem5 minor release](#version-21.0.1.0), we have included a range of new features, and API changes which we outline below.
## Added the Components Library [Alpha Release]
The purpose of the gem5 components library is to provide gem5 users a standard set of common and useful gem5 components, pre-built, to add to their experiments.
The gem5 components library adopts a modular architecture design so components may be easily added, removed, and extended, as needed.
Examples of using the gem5 components library can be found in [`configs/example/components-library`](https://gem5.googlesource.com/public/gem5/+/refs/tags/v21.1.0.0/configs/example/components-library).
**Important Disclaimer:**
This is a pre-alpha release.
The purpose of this release is to get community feedback.
Though some testing has been done, we expect regular fixes and improvements until the library reaches a stable state.
A Jira Ticket outlining TODOs and known bugs can be found at <https://gem5.atlassian.net/browse/GEM5-648>.
## Improvements to GPU simulation
### ROCm 4.0 support
ROCm 4.0 is now officially supported.
### gfx801 (Carrizo) and gfx803 (Fiji) support
gfx801 (Carrizo) and gfx803 (Fiji) are both supported and tested with the gem5-resources applications.
### Better scoreboarding support
Better scoreboarding support has been added.
This reduces stalls by up to 42%.
## Accuracy and coverage stat added to prefetcher caches
Accuracy and coverage stats have been added for prefetcher caches.
Accuracy is defined as the ratio of the number of prefetch requests counted as useful over the total number of prefetch requests issued.
Coverage is defined as the ratio of the number of prefetch requests counted as useful over the number of useful prefetch request plus the remaining demand misses.
## POWER 64-bit SE mode
The POWER 64-bit ISA is now supported in Syscall Execution mode.
## RISC-V PMP now supported
gem5 now supports simulation of RISC-V Physical Memory Protection (PMP).
Simulations can boot and run Keystone and Eyrie.
## Improvements to the replacement policies
The gem5 replacement policies framework now supports more complex algorithms.
It now allows using addresses, PC, and other information within a policy.
**Note:**
Assuming this information is promptly available at the cache may be unrealistic.
### Set Dueling
Classes that handle set dueling have been created ([Dueler and DuelingMonitor](https://gem5.googlesource.com/public/gem5/+/refs/tags/v21.1.0.0/src/mem/cache/tags/dueling.hh)).
They can be used in conjunction with different cache policies.
A [replacement policy that uses it](https://gem5.googlesource.com/public/gem5/+/refs/tags/v21.1.0.0/src/mem/cache/replacement_policies/dueling_rp.hh) has been added for guidance.
## RISC-V is now supported as a host machine.
gem5 is now compilable and runnable on a RISC-V host system.
## New Deprecation MARCOs added
Deprecation MACROS have been added for deprecating namespaces (`GEM5_DEPRECATED_NAMESPACE`), and deprecating other MACROs (`GEM5_DEPRECATED_MACRO`).
**Note:**
For technical reasons, using old macros won't produce any deprecation warnings.
## Refactoring of the gem5 Namespaces
Snake case has been adopted as the new convention for name spaces.
As a consequence, multiple namespaces have been renamed:
* `Minor` -> `minor`
* `Loader` -> `loader`
* `Stats` -> `statistics`
* `Enums` -> `enums`
* `Net` -> `networking`
* `ProbePoints` -> `probing`
* `ContextSwitchTaskId` -> `context_switch_task_id`
* `Prefetcher` -> `prefetch`
* `Encoder` -> `encoder`
* `Compressor` -> `compression`
* `QoS` -> `qos`
* `ReplacementPolicy` -> `replacement_policy`
* `Mouse` -> `mouse`
* `Keyboard` -> `keyboard`
* `Int` -> `as_int`
* `Float` -> `as_float`
* `FastModel` -> `fastmodel`
* `GuestABI` -> `guest_abi`
* `LockedMem` -> `locked_mem`
* `DeliveryMode` -> `delivery_mode`
* `PseudoInst` -> `pseudo_inst`
* `DecodeCache` -> `decode_cache`
* `BitfieldBackend` -> `bitfield_backend`
* `FreeBSD` -> `free_bsd`
* `Linux` -> `linux`
* `Units` -> `units`
* `SimClock` -> `sim_clock`
* `BloomFilter` -> `bloom_filter`
* `X86Macroop` -> `x86_macroop`
* `ConditionTests` -> `condition_tests`
* `IntelMP` -> `intelmp`
* `SMBios` -> `smbios`
* `RomLables` -> `rom_labels`
* `SCMI` -> `scmi`
* `iGbReg` -> `igbreg`
* `Ps2` -> `ps2`
* `CopyEngineReg` -> `copy_engine_reg`
* `TxdOp` -> `txd_op`
* `Sinic` -> `sinic`
* `Debug` -> `debug`
In addition some other namespaces were added:
* `gem5::ruby`, for Ruby-related files
* `gem5::ruby::garnet`, for garnet-related files
* `gem5::o3`, for the O3-cpu's related files
* `gem5::memory`, for files related to memories
Finally, the `m5` namespace has been renamed `gem5`.
## MACROs in `base/compiler.hh`
The MACROs in base/compiler.hh of the form `M5_*` have been deprecated and replaced with macros of the form `GEM5_*`, with some other minor name adjustments.
## MemObject Removed
MemObject simobject had been marked for deprecation and has now been officially removed from the gem5 codebase.
## Minimum GCC version increased to 7; minimum Clang version increased to 6; Clang 10 and 11 supported; C++17 supported
GCC version 5 and 6 are no longer supported.
GCC 7 is now the minimum GCC compiler version supported.
This changes allows has allowed us to move to the C++17 standard for development.
In addition, the minimum Clang version has increased to 6, and Clang 10 and 11 are now officially supported.
# Version 21.0.1.0
Version 21.0.1 is a minor gem5 release consisting of bug fixes. The 21.0.1 release: