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32bit and 64bit Linux have different arguments passed to the __switch_to() function that gem5 hooks into in order to collect context switch statistics. 64bit Linux provides the task_struct pointer to the next task that will be switched to, which means we don't have to look up the task_struct from thread_info as we do in 32bit ARM Linux. This patch adds a second set of accessors to ThreadInfo to extract details such as the pid, tgid, task name, etc., directly from a task_struct. The existing accessors maintain their existing behavior by first looking up the task_struct and then calling these new accessors. A 64-bit variant of the DumpStatsPCEvent class is added that uses these new accessors to get the task details for the context switch dumps directly from the task_struct passed to __switch_to(). Change-Id: I63c4b3e1ad64446751a91f6340901d5180d7382d Reviewed-on: https://gem5-review.googlesource.com/2640 Reviewed-by: Curtis Dunham <curtis.dunham@arm.com> Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Reviewed-by: Pau Cabre <pau.cabre@metempsy.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Maintainer: Andreas Sandberg <andreas.sandberg@arm.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.