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In the MemPool object, the idea of a limit of the pool (largest page) and the total number of pages were conflated, as was the page number of the next "free" page and the total number of pages allocated. Both of those would only be equivalent if the memory pool starts at address zero, which is not generally true and could be true for at most one pool at a time even when it is occasionally true. Instead, this change fixes up MemPool to keep tree values, a starting page number, the page number of the next free page, and the total number of pages in the pool, both allocated and unallocated. With those three values, we can accurately report the number of allocated pages (not just the number of pages of any kind below the next free one), the total number of free pages, and the total number of pages in general (not the largest numbered page in the pool). The value serialized by the System class was adjusted so that it will stay compatible with previous checkpoints. The value unserialized by the system class is passed to the MemPool as a limit, which has not changed and so doesn't need to be updated. It gets translated into the total number of pages in the MemPool constructor. Change-Id: I8268ef410b41bf757df9ee5585ec2f6b0d8499e1 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/50687 Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com> Tested-by: kokoro <noreply+kokoro@google.com>
This is the gem5 simulator. The main website can be found at http://www.gem5.org A good starting point is http://www.gem5.org/about, and for more information about building the simulator and getting started please see http://www.gem5.org/documentation and http://www.gem5.org/documentation/learning_gem5/introduction. To build gem5, you will need the following software: g++ or clang, Python (gem5 links in the Python interpreter), SCons, zlib, m4, and lastly protobuf if you want trace capture and playback support. Please see http://www.gem5.org/documentation/general_docs/building for more details concerning the minimum versions of these tools. Once you have all dependencies resolved, type 'scons build/<CONFIG>/gem5.opt' where CONFIG is one of the options in build_opts like ARM, NULL, MIPS, POWER, SPARC, X86, Garnet_standalone, etc. This will build an optimized version of the gem5 binary (gem5.opt) with the the specified configuration. See http://www.gem5.org/documentation/general_docs/building for more details and options. The main source tree includes these subdirectories: - build_opts: pre-made default configurations for gem5 - build_tools: tools used internally by gem5's build process. - configs: example simulation configuration scripts - ext: less-common external packages needed to build gem5 - include: include files for use in other programs - site_scons: modular components of the build system - src: source code of the gem5 simulator - system: source for some optional system software for simulated systems - tests: regression tests - util: useful utility programs and files To run full-system simulations, you may need compiled system firmware, kernel binaries and one or more disk images, depending on gem5's configuration and what type of workload you're trying to run. Many of those resources can be downloaded from http://resources.gem5.org, and/or from the git repository here: https://gem5.googlesource.com/public/gem5-resources/ If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.