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2019-06-11cpu: Additional TrafficGen statsTiago Muck
Additional stats to keep track of read/write latencies and throughput. Change-Id: I7684cd33cf68fffdef4ca9c3a6db360a0f531c18 Signed-off-by: Tiago Muck <tiago.muck@arm.com> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/18418 Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Maintainer: Andreas Sandberg <andreas.sandberg@arm.com> Tested-by: kokoro <noreply+kokoro@google.com>
2019-06-11cpu: Limit TrafficGen outstanding reqsTiago Muck
Parameter to limit the number of requests waiting for a response. Change-Id: I6cf9e8782a06ae978fb66f7c4278f4c9e9980c79 Signed-off-by: Tiago Muck <tiago.muck@arm.com> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/18417 Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Maintainer: Jason Lowe-Power <jason@lowepower.com> Tested-by: kokoro <noreply+kokoro@google.com>
2019-06-11cpu: TrafficGen as BaseCPUTiago Muck
TrafficGen has additional attributes to behave like a BaseCPU. Python scripts that expect sim. objects derived from BaseCPU can now be used with TrafficGen without additional modifications. Change-Id: Iee848b2ba0ac1851c487b1003da9bd96253d291a Signed-off-by: Tiago Muck <tiago.muck@arm.com> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/18416 Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Maintainer: Jason Lowe-Power <jason@lowepower.com> Tested-by: kokoro <noreply+kokoro@google.com>
2019-05-30cpu: Fix rescheduling of progress check eventsTiago Muck
noRequestEvent needs to be rescheduled on recvRetry, otherwise the timeout may be triggered even though packets are being eventually sent. noResponseEvent scheduling is also fixed. This timeout should not be active when we are not expecting a response. Change-Id: If9edb75b5b803caf9f99bf41ea3948b15a3f3d71 Signed-off-by: Tiago Muck <tiago.muck@arm.com> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/18793 Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Maintainer: Andreas Sandberg <andreas.sandberg@arm.com> Tested-by: kokoro <noreply+kokoro@google.com>
2019-04-28mem: Minimize the use of MemObject.Gabe Black
MemObject doesn't provide anything beyond its base ClockedObject any more, so this change removes it from most inheritance hierarchies. Occasionally MemObject is replaced with SimObject when I was fairly confident that the extra functionality of ClockedObject wasn't needed. Change-Id: Ic014ab61e56402e62548e8c831eb16e26523fdce Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/18289 Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Anthony Gutierrez <anthony.gutierrez@amd.com> Maintainer: Gabe Black <gabeblack@google.com>
2019-03-23misc: missing override specifierAndrea Mondelli
Missing specifier of overridden virtual function declared in sim_object.hh Removed redundant "virtual" keyword Change-Id: I42aa3349b537c9e62607bce20cf1b3aabdb99bf2 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/17468 Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Reviewed-by: Gabe Black <gabeblack@google.com> Maintainer: Gabe Black <gabeblack@google.com>
2019-03-19arch, cpu, dev, gpu, mem, sim, python: start using getPort.Gabe Black
Replace the getMasterPort, getSlavePort, and getEthPort functions with getPort, and remove extraneous mechanisms that are no longer necessary. Change-Id: Iab7e3c02d2f3a0cf33e7e824e18c28646b5bc318 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/17040 Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
2019-02-12python: Don't assume SimObjects live in the global namespaceAndreas Sandberg
The importer in Python 3 doesn't like the way we import SimObjects from the global namespace. Convert the existing SimObject declarations to import from m5.objects. As a side-effect, this makes these files consistent with configuration files. Change-Id: I11153502b430822130722839e1fa767b82a027aa Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-on: https://gem5-review.googlesource.com/c/15981 Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
2018-12-04base, sim: Add missing destructorsNikos Nikoleris
Derived classes with virtual functions need to define a virtual destructor or a protected destructor otherwise calling the base class destructor has undefined behavior. This change adds a virtual distructor in the base class. Change-Id: I1c855aa56dff6585ff99b9147bdb4eb9729a0a53 Signed-off-by: Nikos Nikoleris <nikos.nikoleris@arm.com> Reviewed-on: https://gem5-review.googlesource.com/c/14815 Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Maintainer: Jason Lowe-Power <jason@lowepower.com>
2018-08-24cpu: Stream/SubstreamID support in TrafficGenGiacomo Travaglini
This patch is adding support for generating memory requests which set the StreamID/SubstreamID field, so that is possible to emulate devices attached to an external IOMMU/SMMU with a Traffic generator. Change-Id: Iea068de581ae7125a9d49314124a08c045c75b49 Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-on: https://gem5-review.googlesource.com/12188
2018-08-24cpu: Turn BaseTrafficGen numSuppressed into a statMichiel W. van Tol
This is changing numSuppressed from being a warn only variable into a Stat so that it is visible at the end of simulation. Change-Id: I934782e796c898bfc0e773cc88c597a68e403272 Reviewed-on: https://gem5-review.googlesource.com/11849 Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
2018-08-21misc: Appease GCC 8Jason Lowe-Power
GCC 8 adds a number of new warnings to -Wall which generate errors. - Fix memset to 0 for structs by adding casts. - Fix cast with const when the const was ignored. - Fix catch a polymorphic type by value We now compile with GCC 8! Change-Id: Iab70ce11190eee67608fc25c0bedff170152b153 Signed-off-by: Jason Lowe-Power <jason@lowepower.com> Reviewed-on: https://gem5-review.googlesource.com/11949 Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
2018-08-17scons,ruby: do not generate unnecessary filesBrandon Potter
Do not generate garnet tester file or Ruby debug headers without a Ruby protocol (i.e. PROTOCOL=None). It makes no sense to include these files into the build when there will be no protocol to utilize them. Change-Id: I8db4dd532f60008217a10c88a2e089f85df9d104 Reviewed-on: https://gem5-review.googlesource.com/8381 Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Maintainer: Jason Lowe-Power <jason@lowepower.com>
2018-07-25cpu: Warn when (un)serializing a traffic generatorGiacomo Travaglini
When checkpointing a system with a traffic generator, a warning is produced so that the user is reminded serialization does not keep all the traffic generator internal state. Change-Id: I3c49c912c9ff3a4208f55b2da0a88fc694147280 Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-on: https://gem5-review.googlesource.com/11831 Reviewed-by: Anthony Gutierrez <anthony.gutierrez@amd.com> Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Maintainer: Jason Lowe-Power <jason@lowepower.com>
2018-07-25cpu: Allow creation of traffic gen from generic SimObjectsGiacomo Travaglini
This patch allows to instantiate a Traffic generator starting from a generic SimObject, so that linking to a BaseTrafficGen only is no longer mandatory. This permits SimObjects different than a BaseTrafficGen to instantiate generators and to manually specify the MasterID they will be using when generating memory requests. Change-Id: Ic286cfa49fd9c9707e6f12a4ea19993dd3006b2b Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-on: https://gem5-review.googlesource.com/11789 Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
2018-07-13cpu: Add a Python-enabled traffic generatorAndreas Sandberg
The current traffic generator relies on a configuration file that describes a small machine to generate stimuli. This configuration file is usually generated by the gem5 Python configuration. This creates an unnecessary and fragile step. This changeset introduces a Python-based trace module. When instantiated, the module exposes a start method that takes an iterable object as a parameter (e.g., a generator). The iterable object is expected to represent a list of generators that will be run one after the other. For example: system.tgen = PyTrafficGen() m5.instantiate() def trace(): yield system.tgen.createIdle(1000) yield system.tgen.createExit(0) system.tgen.start(trace()) Change-Id: I58e60ca517e86c197859f4daaa67750066abdc1c Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com> Reviewed-on: https://gem5-review.googlesource.com/11518 Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
2018-07-13cpu: Support trace termination in BaseTrafficGenAndreas Sandberg
Make the BaseTrafficGen handle cases where getNextPacket() can't find a new packet and returns NULL. In that case, assume the generator has run out of packets and switch to the next generator. Change-Id: I5ca6ead550005812fb849ed9ce6b5007a65ddfa7 Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com> Reviewed-on: https://gem5-review.googlesource.com/11517 Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
2018-07-13cpu: Unify error handling for address generatorsAndreas Sandberg
Unify error handling and create factory methods for address generators. Change-Id: Ic3ab705e1bb58affd498a7db176536ebc721b904 Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com> Reviewed-on: https://gem5-review.googlesource.com/11516 Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
2018-07-13cpu: Split the traffic generator into two classesAndreas Sandberg
The traffic generator currently assumes that it is always driven from a configuration file. Split it into a base class (BaseTrafficGen) that handles basic packet generation and a derived class that implements the config handling (TrafficGen). Change-Id: I9407f04c40ad7e40a263c8d1ef29d37ff8e6f1b4 Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com> Reviewed-on: https://gem5-review.googlesource.com/11515
2018-06-28cpu: Remove reduntant protobuf includesAndreas Sandberg
Change-Id: Ic34b94b3a2ea951bc023cfce2d09ce304a602e41 Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com> Reviewed-on: https://gem5-review.googlesource.com/11512 Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
2018-06-11misc: Using smart pointers for memory RequestsGiacomo Travaglini
This patch is changing the underlying type for RequestPtr from Request* to shared_ptr<Request>. Having memory requests being managed by smart pointers will simplify the code; it will also prevent memory leakage and dangling pointers. Change-Id: I7749af38a11ac8eb4d53d8df1252951e0890fde3 Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-on: https://gem5-review.googlesource.com/10996 Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com> Maintainer: Nikos Nikoleris <nikos.nikoleris@arm.com>
2018-06-11misc: Substitute pointer to Request with aliased RequestPtrGiacomo Travaglini
Every usage of Request* in the code has been replaced with the RequestPtr alias. This is a preparing patch for when RequestPtr will be the typdefed to a smart pointer to Request rather then a raw pointer to Request. Change-Id: I73cbaf2d96ea9313a590cdc731a25662950cd51a Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com> Reviewed-on: https://gem5-review.googlesource.com/10995 Reviewed-by: Anthony Gutierrez <anthony.gutierrez@amd.com> Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br> Maintainer: Anthony Gutierrez <anthony.gutierrez@amd.com>
2018-04-27sim,cpu,mem,arch: Introduced MasterInfo data structureGiacomo Travaglini
With this patch a gem5 System will store more info about its Masters. While it was previously keeping track of the Master name and Master ID only, it is now adding a per-Master pointer to the SimObject related to the Master. This will make it possible for a client to query a System for a Master using either the master's name or the master's pointer. Change-Id: I8b97d328a65cd06f329e2cdd3679451c17d2b8f6 Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-on: https://gem5-review.googlesource.com/9781 Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Maintainer: Nikos Nikoleris <nikos.nikoleris@arm.com>
2018-03-23ruby: Make sure addresses print in hexJason Lowe-Power
Added fix in the invalid transition panic and various places in ruby random tester. Change-Id: I879264da58369faf7de49d1a28b2da1cb935ef0a Signed-off-by: Jason Lowe-Power <jason@lowepower.com> Reviewed-on: https://gem5-review.googlesource.com/8941 Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
2017-12-20cpu: Fix exit_gen.cc which used misc.hh instead of logging.hh.Gabe Black
Change-Id: I868021a01eb3e7902a4d64283bdfaa93c6d9f964 Reviewed-on: https://gem5-review.googlesource.com/6822 Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
2017-12-19cpu-tester: Added ExitGen to TrafficGenRiken Gohil
Added the ExitGen to the TrafficGenerator which allows an EXIT state to be added to the TrafficGen configuration file. Entering this state will cause the simulation to exit immediately. Please note that if multiple TrafficGen instances have an EXIT state, the first of these to be encountered will cause the simulation to terminate. Change-Id: Ieea51f05ffb780771f007787a2b119f79143d0c1 Reviewed-by: Sascha Bischoff <sascha.bischoff@arm.com> Reviewed-on: https://gem5-review.googlesource.com/5723 Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
2017-12-19cpu-tester: Refactoring traffic generators into separate files.Riken Gohil
Change-Id: I2372a0a88e276dcb0c06c3d0a789e010cfba8013 Reviewed-by: Matteo Andreozzi <matteo.andreozzi@arm.com> Reviewed-on: https://gem5-review.googlesource.com/5722 Maintainer: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
2017-12-04misc: Rename misc.(hh|cc) to logging.(hh|cc)Gabe Black
These files aren't a collection of miscellaneous stuff, they're the definition of the Logger interface, and a few utility macros for calling into that interface (panic, warn, etc.). Change-Id: I84267ac3f45896a83c0ef027f8f19c5e9a5667d1 Reviewed-on: https://gem5-review.googlesource.com/6226 Reviewed-by: Brandon Potter <Brandon.Potter@amd.com> Maintainer: Gabe Black <gabeblack@google.com>
2017-07-12testers: Refactor some Event subclasses to lambdasSean Wilson
Change-Id: I897b6162a827216b7bad74d955c0e50e06a5a3ec Signed-off-by: Sean Wilson <spwilson2@wisc.edu> Reviewed-on: https://gem5-review.googlesource.com/3926 Maintainer: Jason Lowe-Power <jason@lowepower.com> Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
2017-06-20cpu, gpu-compute: Replace EventWrapper use with EventFunctionWrapperSean Wilson
Change-Id: Idd5992463bcf9154f823b82461070d1f1842cea3 Signed-off-by: Sean Wilson <spwilson2@wisc.edu> Reviewed-on: https://gem5-review.googlesource.com/3746 Reviewed-by: Anthony Gutierrez <anthony.gutierrez@amd.com> Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Maintainer: Jason Lowe-Power <jason@lowepower.com>
2016-11-09style: [patch 3/22] reduce include dependencies in some headersBrandon Potter
Used cppclean to help identify useless includes and removed them. This involved erroneously included headers, but also cases where forward declarations could have been used rather than a full include.
2016-11-09style: [patch 1/22] use /r/3648/ to reorganize includesBrandon Potter
2016-12-05cpu: Change traffic generators to use different values for writesNikos Nikoleris
Previously all traffic generators would use the same value for write requests. With this change traffic generators use their master id as the payload of write requests making them more useful for the memchecker. Change-Id: Id1a6b8f02853789b108ef6003f4c32ab929bb123 Reviewed-by: Andreas Hansson <andreas.hansson@arm.com> Reviewed-by: Stephan Diestelhorst <stephan.diestelhorst@arm.com>
2016-10-06ruby: rename networktest to garnet_synthetic_traffic.Tushar Krishna
networktest is essentially a collection of synthetic traffic patterns for the network. The protocol name and the tester having the same name led to multiple python configuration files with the same name, adding confusion. This patch renames networktest to garnet_synthetic_traffic, and also adds more synthetic traffic patterns.
2016-06-20mem: Resolve TrafficGen trace relative to the configAndreas Sandberg
The traffic generator currently resolves relative trace paths relative to gem5's current working directory. This can lead to surprising results for relative paths where the expectation would normally be that they are resolved relative to the configuration file. This changeset implements config-relative trace file lookups. The old behavior is kept as a fallback for configs that expect that behavior. Change-Id: I1bda4e16725842666ffc37dcb6838c23a6ff138c Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-by: Curtis Dunham <curtis.dunham@arm.com>
2016-06-06stats: Fixing regStats function for some SimObjectsDavid Guillen Fandos
Fixing an issue with regStats not calling the parent class method for most SimObjects in Gem5. This causes issues if one adds new stats in the base class (since they are never initialized properly!). Change-Id: Iebc5aa66f58816ef4295dc8e48a357558d76a77c Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
2016-06-06sim: Call regStats of base-class as wellStephan Diestelhorst
We want to extend the stats of objects hierarchically and thus it is necessary to register the statistics of the base-class(es), as well. For now, these are empty, but generic stats will be added there. Patch originally provided by Akash Bagdia at ARM Ltd.
2016-05-26cpu: Add a basic progress check to the TrafficGenAndreas Hansson
This patch adds a progress check to the TrafficGen so that it is easier to detect deadlock scenarios where the generator gets stuck waiting for a retry, and makes no further progress. Change-Id: Ifb8779ad0939f52c0518d0e867bac73f99b82e2b Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-by: Radhika Jagtap <radhika.jagtap@arm.com>
2016-04-07mem: Remove threadId from memory request classMitch Hayenga
In general, the ThreadID parameter is unnecessary in the memory system as the ContextID is what is used for the purposes of locks/wakeups. Since we allocate sequential ContextIDs for each thread on MT-enabled CPUs, ThreadID is unnecessary as the CPUs can identify the requesting thread through sideband info (SenderState / LSQ entries) or ContextID offset from the base ContextID for a cpu. This is a re-spin of 20264eb after the revert (bd1c6789) and includes some fixes of that commit.
2016-04-07Revert to 74c1e6513bd0 (sim: Thermal support for Linux)Andreas Sandberg
2016-04-06Revert power patch sets with unexpected interactionsAndreas Sandberg
The following patches had unexpected interactions with the current upstream code and have been reverted for now: e07fd01651f3: power: Add support for power models 831c7f2f9e39: power: Low-power idle power state for idle CPUs 4f749e00b667: power: Add power states to ClockedObject Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com> --HG-- extra : amend_source : 0b6fb073c6bbc24be533ec431eb51fbf1b269508
2016-04-05mem: Remove threadId from memory request classMitch Hayenga
In general, the ThreadID parameter is unnecessary in the memory system as the ContextID is what is used for the purposes of locks/wakeups. Since we allocate sequential ContextIDs for each thread on MT-enabled CPUs, ThreadID is unnecessary as the CPUs can identify the requesting thread through sideband info (SenderState / LSQ entries) or ContextID offset from the base ContextID for a cpu.
2014-11-18power: Add power states to ClockedObjectAkash Bagdia
Add 4 power states to the ClockedObject, provides necessary access functions to check and update the power state. Default power state is UNDEFINED, it is responsibility of the respective simulation model to provide the startup state and any other logic for state change. Add number of transition stat. Add distribution of time spent in clock gated state. Add power state residency stat. Add dump call back function to allow stats update of distribution and residency stats.
2016-03-20cpu: warn if TrafficGen is suppressing a large numer of packetsAndreas Hansson
Add a basic warning for every 10000 packet that is suppressed to alert the user.
2016-02-24cpu: TraceGen fix for tick frequency checkMatteo Andreozzi
Bug fix for check on protobuf file frequency being different than global frequency. The ASCII encoder script is also fixed, and the example trace used in the regressions is updated.
2016-02-06style: remove trailing whitespaceSteve Reinhardt
Result of running 'hg m5style --skip-all --fix-white -a'.
2015-07-20ruby: more flexible ruby tester supportBrad Beckmann
This patch allows the ruby random tester to use ruby ports that may only support instr or data requests. This patch is similar to a previous changeset (8932:1b2c17565ac8) that was unfortunately broken by subsequent changesets. This current patch implements the support in a more straight-forward way. Since retries are now tested when running the ruby random tester, this patch splits up the retry and drain check behavior so that RubyPort children, such as the GPUCoalescer, can perform those operations correctly without having to duplicate code. Finally, the patch also includes better DPRINTFs for debugging the tester.
2015-11-22cpu: Fix memory leak in traffic generatorAndreas Hansson
In cases where we discard the packet, make sure to also delete it and the associated request.
2015-10-12misc: Add explicit overrides and fix other clang >= 3.5 issuesAndreas Hansson
This patch adds explicit overrides as this is now required when using "-Wall" with clang >= 3.5, the latter now part of the most recent XCode. The patch consequently removes "virtual" for those methods where "override" is added. The latter should be enough of an indication. As part of this patch, a few minor issues that clang >= 3.5 complains about are also resolved (unused methods and variables).
2015-10-12misc: Remove redundant compiler-specific definesAndreas Hansson
This patch moves away from using M5_ATTR_OVERRIDE and the m5::hashmap (and similar) abstractions, as these are no longer needed with gcc 4.7 and clang 3.1 as minimum compiler versions.
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