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Fence instruction origially had two flags NonSpeculative and MemBarrier. In O3 model, MemBarrier instructions are inserted into the instruction queue by the InstructionQueue::insertBarrier (at src/cpu/o3/iew_impl.hh:1083). Barrier instructions are implicitly assumed to be non-speculative. Adding NonSpeculative flag to fence instruction makes it inserted into the instruction queue twice (at src/cpu/o3/iew_impl.hh:1083 and :1111). This can lead to a deadlock if both pointers to the instruction are not cleared from the queue when the instruction retires. This patch removes NonSpeculative flag from the fence inst. Change-Id: I26573d12a0b52f43b73c0e51158286dc98d05ea4 Reviewed-on: https://gem5-review.googlesource.com/c/8183 Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Reviewed-by: Alec Roelke <ar4jc@virginia.edu> Maintainer: Alec Roelke <ar4jc@virginia.edu>
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/Introduction, and for more information about building the simulator and getting started please see http://www.gem5.org/Documentation and http://www.gem5.org/Tutorials. To build gem5, you will need the following software: g++ or clang, Python (gem5 links in the Python interpreter), SCons, SWIG, zlib, m4, and lastly protobuf if you want trace capture and playback support. Please see http://www.gem5.org/Dependencies for more details concerning the minimum versions of the aforementioned tools. Once you have all dependencies resolved, type 'scons build/<ARCH>/gem5.opt' where ARCH is one of ALPHA, ARM, NULL, MIPS, POWER, SPARC, or X86. This will build an optimized version of the gem5 binary (gem5.opt) for the the specified architecture. See http://www.gem5.org/Build_System for more details and options. With the simulator built, have a look at http://www.gem5.org/Running_gem5 for more information on how to use gem5. The basic source release includes these subdirectories: - configs: example simulation configuration scripts - ext: less-common external packages needed to build gem5 - 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 will need compiled system firmware (console and PALcode for Alpha), kernel binaries and one or more disk images. Please see the gem5 download page for these items at http://www.gem5.org/Download If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.