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There are cases where Drainable objects need to create new objects in Drainable::resume(). In such cases, the local drain state will be inherited from the DrainManager. We currently set the state to Running as soon as we start resuming the simulator. This means that new objects are created in the Running state rather than the Drained state, which the resume code assumes. Depending on the traversal order in DrainManager::resume(), this sometimes triggers a panic because the object being resumed is in the wrong state. This change introduces a new drain state, Resuming, that the DrainManager enters as soon as it starts resuming the simulator. Objects that are created while resuming are created in this state. Such objects are then resumed in a subsequent pass over the list of Drainable objects that need to be resumed. Once all objects have been resumed, the simulator enters the Running state. Change-Id: Ieee8645351ffbdec477e9cd2ff86fc795e459617 Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-by: Curtis Dunham <curtis.dunham@arm.com> Reviewed-on: https://gem5-review.googlesource.com/2600 Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Reviewed-by: Weiping Liao <weipingliao@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/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.