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2015-07-20ruby: initialize replacement policies with their own simobjsDavid Hashe
this is in preparation for other replacement policies that take additional parameters.
2015-07-21configs: network test: remove redundant physical memoryNilay Vaish
2015-07-10ruby: remove extra whitespace and correct misspelled wordsBrandon Potter
2015-07-04config: Update location of ruby topologies in helpDavid Hashe
Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2015-07-03mem: Remove redundant is_top_level cache parameterAndreas Hansson
This patch takes the final step in removing the is_top_level parameter from the cache. With the recent changes to read requests and write invalidations, the parameter is no longer needed, and consequently removed. This also means that asymmetric cache hierarchies are now fully supported (and we are actually using them already with L1 caches, but no table-walker caches, connected to a shared L2).
2015-07-03mem: Allow read-only caches and check complianceAndreas Hansson
This patch adds a parameter to the BaseCache to enable a read-only cache, for example for the instruction cache, or table-walker cache (not for x86). A number of checks are put in place in the code to ensure a read-only cache does not end up with dirty data. A follow-on patch adds suitable read requests to allow a read-only cache to explicitly ask for clean data.
2015-06-01kvm, arm: Add support for aarch64Andreas Sandberg
This changeset adds support for aarch64 in kvm. The CPU module supports both checkpointing and online CPU model switching as long as no devices are simulated by the host kernel. It currently has the following limitations: * The system register based generic timer can only be simulated by the host kernel. Workaround: Use a memory mapped timer instead to simulate the timer in gem5. * Simulating devices (e.g., the generic timer) in the host kernel requires that the host kernel also simulates the GIC. * ID registers in the host and in gem5 must match for switching between simulated CPUs and KVM. This is particularly important for ID registers describing memory system capabilities (e.g., ASID size, physical address size). * Switching between a virtualized CPU and a simulated CPU is currently not supported if in-kernel device emulation is used. This could be worked around by adding support for switching to the gem5 (e.g., the KvmGic) side of the device models. A simpler workaround is to avoid in-kernel device models altogether.
2015-05-15config: Use null memory for DRAM sweep scriptAndreas Hansson
Do not waste time when we do not care about the data.
2015-05-15config: Add new MemConfig options to DRAM sweep scriptWendy Elsasser
Update script to match current MemConfig options with external_memory_system option set to 0.
2015-05-05arch, cpu: Do not forward snoops to table walkerAndreas Hansson
This patch simplifies the overall CPU by changing the TLB caches such that they do not forward snoops to the table walker port(s). Note that only ARM and X86 are affected. There is no reason for the ports to snoop as they do not actually take any action, and from a performance point of view we are better of not snooping more than we have to. Should it at a later point be required to snoop for a particular TLB design it is easy enough to add it back.
2015-04-29cpu: o3: replace issueLatency with bool pipelinedNilay Vaish
Currently, each op class has a parameter issueLat that denotes the cycles after which another op of the same class can be issued. As of now, this latency can either be one cycle (fully pipelined) or same as execution latency of the op (not at all pipelined). The fact that issueLat is a parameter of type Cycles makes one believe that it can be set to any value. To avoid the confusion, the parameter is being renamed as 'pipelined' with type boolean. If set to true, the op would execute in a fully pipelined fashion. Otherwise, it would execute in an unpipelined fashion.
2015-04-23config: enable setting SE-mode environment variables from filebpotter
2015-04-20config: Remove memory aliases and rely on class nameAndreas Hansson
Instead of maintaining two lists, rely entirely on the class name. There is really no point in causing unecessary confusion.
2015-04-14config, cpu: fix progress interval for switched CPUsMalek Musleh
This patch ensures that the CPU progress Event is triggered for the new set of switched_cpus that get scheduled (e.g. during fast-forwarding). it also avoids printing the interval state if the cpu is currently switched out. Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2015-04-13cpu: re-organizes the branch predictor structure.Dibakar Gope
Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2015-04-08config: Support full-system with SST's memory systemCurtis Dunham
This patch adds an example configuration in ext/sst/tests/ that allows an SST/gem5 instance to simulate a 4-core AArch64 system with SST's memHierarchy components providing all the caches and memories.
2015-03-27arm, configs: Do not forward snoops from I cacheAndreas Hansson
This fix simply tells the I cache to not forward snoops to the fetch unit (since there is really no reason to do so).
2015-03-23config: expand '~' and '~user' in pathsSteve Reinhardt
2015-03-23config: Add ability to exit simulation after initializationCurtis Dunham
When using gem5 as a slave simulator, it will not advance the clock on its own and depends on the master simulator calling simulate(). This new option lets us use the Python scripts to do all the configuration while stopping short of actually simulating anything.
2015-03-19config: Add soak test for memtest.pyAndreas Hansson
This patch adds a random option to memtest.py which allows the user to easily test valid random tree topologies. The patch also adds a wrapper script to run soak tests using the newly introduced option. We also adjust the progress interval and progress limit check to make the output less noisy, and avoid false positives. Bring on the pain.
2015-03-19config: Specify OS type and release on command lineChris Emmons
This patch enables users to speficy --os-type on the command line. This option is used to take specific actions for an OS type, such as changing the kernel command line. This patch is part of the Android KitKat enablement.
2015-03-19config: Fix DRAM rank option in sweep scriptAndreas Hansson
Align with changes in the common bits.
2015-03-09config: Fix for 'android' lookup in disk nameRizwana Begum
This patch modifies FSConfig.py to look for 'android' only in disk image name. Before this patch, 'android' was searched in full disk path. Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2015-03-02mem: Move crossbar default latencies to subclassesAndreas Hansson
This patch introduces a few subclasses to the CoherentXBar and NoncoherentXBar to distinguish the different uses in the system. We use the crossbar in a wide range of places: interfacing cores to the L2, as a system interconnect, connecting I/O and peripherals, etc. Needless to say, these crossbars have very different performance, and the clock frequency alone is not enough to distinguish these scenarios. Instead of trying to capture every possible case, this patch introduces dedicated subclasses for the three primary use-cases: L2XBar, SystemXBar and IOXbar. More can be added if needed, and the defaults can be overridden.
2015-02-26Ruby: Update backing store option to propagate through to all RubyPortsJason Power
Previously, the user would have to manually set access_backing_store=True on all RubyPorts (Sequencers) in the config files. Now, instead there is one global option that each RubyPort checks on initialization. Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2015-02-16config: Add memcheck stress testAndreas Hansson
This is a rather unfortunate copy of the memtest.py example script, that actually stresses the system with true sharing as opposed to the false sharing of the MemTest. To do so it uses TrafficGen instances to generate the reads/writes, and MemCheckerMonitor combined with the MemChecker to check the validity of the read/written values. As a bonus, this script also enables the addition of prefetchers, and the traffic is created to have a mix of random addresses and linear strides. We use the TaggedPrefetcher since the packets do not have a request with a PC. At the moment the code is almost identical to the memtest.py script, and no effort has been made to factor out the construction of the tree. The challenge is that the instantiation and connection of the testers and monitors is done as part of the tree building.
2015-01-16config: add --root-device machine parameterCurtis Dunham
In case /dev/sda1 is not actually the boot partition for an image, we can override it on the command line or in a benchmark definition.
2015-02-11config: Revamp memtest to allow testers on any levelAndreas Hansson
This patch revamps the memtest example script and allows for the insertion of testers at any level in the cache hierarchy. Previously all created topologies placed testers only at the very top, and the tree was thus entirely symmetric. With the changes made, it is possible to not only place testers at the leaf caches (L1), but also to connect testers at the L2, L3 etc. As part of the changes the object hierarchy is also simplified to ensure that the visual representation from the DOT printing looks sensible. Using SubSystems to group the objects is one of the key features.
2015-02-11cpu: Tidy up the MemTest and make false sharing more obviousAndreas Hansson
The MemTest class really only tests false sharing, and as such there was a lot of old cruft that could be removed. This patch cleans up the tester, and also makes it more clear what the assumptions are. As part of this simplification the reference functional memory is also removed. The regression configs using MemTest are updated to reflect the changes, and the stats will be bumped in a separate patch. The example config will be updated in a separate patch due to more extensive re-work. In a follow-on patch a new tester will be introduced that uses the MemChecker to implement true sharing.
2015-02-05config: rename 'file' varSteve Reinhardt
Rename uses of 'file' as a local variable to avoid conflict with the built-in type of the same name.
2015-02-05config: make M5_PATH a real search pathSteve Reinhardt
Although you can put a list of colon-separated directory names in M5_PATH, the current code just takes the first one that exists and assumes all files must live there. This change makes the code search the specified list of directories for each individual binary or disk image that's requested. The main motivation is that the x86/Alpha binaries and the ARM binaries are in separate downloads, and thus naturally end up in separate directories. With this change, you can have M5_PATH point to those two directories, then run any FS regression test without changing M5_PATH. Currently, you either have to merge the two download directories or change M5_PATH (or do something else I haven't figured out).
2015-02-03config: Add XOR hashing to the DRAM channel interleavingAndreas Hansson
This patch uses the recently added XOR hashing capabilities for the DRAM channel interleaving. This avoids channel biasing due to strided access patterns.
2015-02-03config: Adjust DRAM channel interleaving defaultsAndreas Hansson
This patch changes the DRAM channel interleaving default behaviour to be more representative. The default address mapping (RoRaBaCoCh) moves the channel bits towards the least significant bits, and uses 128 byte as the default channel interleaving granularity. These defaults can be overridden if desired, but should serve as a sensible starting point for most use-cases.
2015-01-30config: arm: fix os_flagsMalek Musleh
Fix the makeArmSystem routine to reflect recent changes that support kernel commandline option when running android. Without this fix, trying to run android encounters a 'reference before assignment' error. Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2015-01-20config, ruby: connect dma to networkMalek Musleh
DMA Controller was not being connected to the network for the MESI_Three_Level protocol as was being done in the other protocol config files. Without this patch, this protocol segfaults during startup. Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2015-01-20scons: Do not build the InOrderCPUAndreas Hansson
One step closer to shifting focus to the MinorCPU.
2015-01-03arm: fix build_drive_system when not using default optionsAnthony Gutierrez
when trying to dual boot on arm build_drive_system will only use the default values for the dtb file, number of processors, and disk image. if you are using the non-default files by passing values on the command line for example, or by making a new entry in Benchmarks.py, the build config scripts will still look for the default files. this will lead to the wrong system files being used, or the simulator will fail if you do not have them. Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2015-01-03configs: ruby: removes bug introduced by 05b5a6cf3521Nilay Vaish
2014-12-23config: Expose the DRAM ranks as a command-line optionAndreas Hansson
This patch gives the user direct influence over the number of DRAM ranks to make it easier to tune the memory density without affecting the bandwidth (previously the only means of scaling the device count was through the number of channels). The patch also adds some basic sanity checks to ensure that the number of ranks is a power of two (since we rely on bit slices in the address decoding).
2014-12-23config: Add --memchecker optionMarco Elver
This patch adds the --memchecker option, to denote that a MemChecker should be instantiated for the system. The exact usage of the MemChecker depends on the system configuration. For now CacheConfig.py makes use of the option, adding MemCheckerMonitor instances between CPUs and D-Caches. Note, however, that currently this only provides limited checking on a running system; other parts of the system, such as I/O devices are not monitored, and may cause warnings to be issued by the monitor.
2014-12-23config: Add options to take/resume from SimPoint checkpointsDam Sunwoo
More documentation at http://gem5.org/Simpoints Steps to profile, generate, and use SimPoints with gem5: 1. To profile workload and generate SimPoint BBV file, use the following option: --simpoint-profile --simpoint-interval <interval length> Requires single Atomic CPU and fastmem. <interval length> is in number of instructions. 2. Generate SimPoint analysis using SimPoint 3.2 from UCSD. (SimPoint 3.2 not included with this flow.) 3. To take gem5 checkpoints based on SimPoint analysis, use the following option: --take-simpoint-checkpoint=<simpoint file path>,<weight file path>,<interval length>,<warmup length> <simpoint file> and <weight file> is generated by SimPoint analysis tool from UCSD. SimPoint 3.2 format expected. <interval length> and <warmup length> are in number of instructions. 4. To resume from gem5 SimPoint checkpoints, use the following option: --restore-simpoint-checkpoint -r <N> --checkpoint-dir <simpoint checkpoint path> <N> is (SimPoint index + 1). E.g., "-r 1" will resume from SimPoint #0.
2014-12-04config: Add two options for setting the kernel command line.Gabe Black
Both options accept template which will, through python string formatting, have "mem", "disk", and "script" values substituted in from the mdesc. Additional values can be used on a case by case basis by passing them as keyword arguments to the fillInCmdLine function. That makes it possible to have specialized parameters for a particular ISA, for instance. The first option lets you specify the template directly, and the other lets you specify a file which has the template in it.
2014-12-04config: ruby: mi protocol: correct master slave setting for dmaNilay Vaish
In the MI protocol, the master slave connection between the dma controller and network was being set incorrectly. This patch corrects it.
2014-12-03config: Get rid of some extra spaces around default arguments.Gabe Black
2014-11-23config, kvm: Enabling KvmCPU in SE modeAlexandru Dutu
This patch modifies se.py such that it can now use kvm cpu model.
2014-11-23Backed out prior changeset f9fb64a72259Steve Reinhardt
Back out use of importlib to avoid implicitly creating dependency on Python 2.7.
2014-11-23config: ruby: Get rid of an "eval" and an "exec" operating on generated code.Gabe Black
We can get the same result using importlib.
2014-11-18configs: small fix to ruby portion of fs.py and se.pyNilay Vaish
In fs.py the io port controller was being attached to the iobus multiple times. This should be done only once. In se.py, the the option use_map was being set which no longer exists.
2014-11-06x86 isa: This patch attempts an implementation at mwait.Marc Orr
Mwait works as follows: 1. A cpu monitors an address of interest (monitor instruction) 2. A cpu calls mwait - this loads the cache line into that cpu's cache. 3. The cpu goes to sleep. 4. When another processor requests write permission for the line, it is evicted from the sleeping cpu's cache. This eviction is forwarded to the sleeping cpu, which then wakes up. Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2014-11-06ruby: provide a backing storeNilay Vaish
Ruby's functional accesses are not guaranteed to succeed as of now. While this is not a problem for the protocols that are currently in the mainline repo, it seems that coherence protocols for gpus rely on a backing store to supply the correct data. The aim of this patch is to make this backing store configurable i.e. it comes into play only when a particular option: --access-backing-store is invoked. The backing store has been there since M5 and GEMS were integrated. The only difference is that earlier the system used to maintain the backing store and ruby's copy was write-only. Sometime last year, we moved to data being supplied supplied by ruby in SE mode simulations. And now we have patches on the reviewboard, which remove ruby's copy of memory altogether and rely completely on the system's memory to supply data. This patch adds back a SimpleMemory member to RubySystem. This member is used only if the option: access-backing-store is set to true. By default, the memory would not be accessed.