Commit graph

10056 commits

Author SHA1 Message Date
Ola Jeppsson
7f16951451 unittest: Fix build errors
Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2014-01-30 12:21:58 -06:00
Mitch Hayenga
96317d466e mem: Add additional tolerance to stride prefetcher
Forces the prefetcher to mispredict twice in a row before resetting the
confidence of prefetching.  This helps cases where a load PC strides by a
constant factor, however it may operate on different arrays at times.
Avoids the cost of retraining.  Primarily helps with small iteration loops.

Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2014-01-29 23:21:26 -06:00
Mitch Hayenga
771c864bf4 mem: Allowed tagged instruction prefetching in stride prefetcher
For systems with a tightly coupled L2, a stride-based prefetcher may observe
access requests from both instruction and data L1 caches.  However, the PC
address of an instruction miss gives no relevant training information to the
stride based prefetcher(there is no stride to train).  In theses cases, its
better if the L2 stride prefetcher simply reverted back to a simple N-block
ahead prefetcher.  This patch enables this option.

Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2014-01-29 23:21:26 -06:00
Mitch Hayenga ext:(%2C%20Amin%20Farmahini%20%3Caminfar%40gmail.com%3E)
95735e10e7 mem: prefetcher: add options, support for unaligned addresses
This patch extends the classic prefetcher to work on non-block aligned
addresses.  Because the existing prefetchers in gem5 mask off the lower
address bits of cache accesses, many predictable strides fail to be
detected.  For example, if a load were to stride by 48 bytes, with 64 byte
cachelines, the current stride based prefetcher would see an access pattern
of 0, 64, 64, 128, 192.... Thus not detecting a constant stride pattern.  This
patch fixes this, by training the prefetcher on access and not masking off the
lower address bits.

It also adds the following configuration options:
1) Training/prefetching only on cache misses,
2) Training/prefetching only on data acceses,
3) Optionally tagging prefetches with a PC address.
#3 allows prefetchers to train off of prefetch requests in systems with
multiple cache levels and PC-based prefetchers present at multiple levels.
It also effectively allows a pipelining of prefetch requests (like in POWER4)
across multiple levels of cache hierarchy.

Improves performance on my gem5 configuration by 4.3% for SPECINT and 4.7%  for SPECFP (geomean).
2014-01-29 23:21:25 -06:00
Xiangyu Dong
32cc2ea8b9 cpu: fix bug when TrafficGen deschedules event
Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2014-01-29 22:35:04 -06:00
Mitch Hayenga
b77ca57f8c arm: Enable umask syscall in SE mode
Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2014-01-28 18:00:51 -06:00
Mitch Hayenga
55a4ff5f04 base: Fix race condition in the socket listen function
gem5 makes the incorrect assumption that by binding a socket, it
effectively has allocated a port. Linux only allocates ports once you call
listen on the given socket, not when you call bind.  So even if the port was
free when bind was called, another process (gem5 instance) could race in
between the bind & listen calls and steal the port. In the current code, if
the call to bind fails due to the port being in use (EADDRINUSE), gem5 retries
for a different port.  However if listen fails, gem5 just panics. The fix is
testing the return value of listen and re-trying if it was due to EADDRINUSE.

Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2014-01-28 18:00:51 -06:00
Amin Farmahini
ffbdaa7cce mem: Remove redundant findVictim() input argument
The patch
(1) removes the redundant writeback argument from findVictim()
(2) fixes the description of access() function

Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2014-01-28 18:00:50 -06:00
Amin Farmahini
575a73f4a1 mem: Fixes a bug in simple_dram write merging
Fixes updating the value of size in the write merge function.

Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2014-01-28 18:00:49 -06:00
Nilay Vaish
7792dedfdd x86: add a warning about the number of memory controllers
When memory size > 3GB, print a warning that twice the number of memory
controllers would be created.
2014-01-28 07:15:53 -06:00
Nilay Vaish
bdee69d0b1 x86: use lfpimm instead of limm for fptan 2014-01-27 18:50:54 -06:00
Nilay Vaish
6a543b5134 x86: implements x87 add/sub instructions 2014-01-27 18:50:53 -06:00
Nilay Vaish
5be0b846b1 x86: implements fxch instruction. 2014-01-27 18:50:52 -06:00
Nilay Vaish
4eb3b1ed0b x86: correct error in emms instruction. 2014-01-27 18:50:51 -06:00
Nilay Vaish
95b782f600 config: allow more than 3GB of memory for x86 simulations
This patch edits the configuration files so that x86 simulations can have
more than 3GB of memory.  It also corrects a bug in the MemConfig.py script.
2014-01-27 18:50:51 -06:00
Nilay Vaish
fa0ff1c902 stats: update sparc fs stats 2014-01-27 13:30:37 -06:00
Steve Reinhardt
85016c2d45 stats: update eio stats for recent changes 2014-01-27 00:38:58 -05:00
Ali Saidi
cfb805cc71 stats: update stats for ARMv8 changes 2014-01-24 15:29:34 -06:00
ARM gem5 Developers
612f8f074f arm: Add support for ARMv8 (AArch64 & AArch32)
Note: AArch64 and AArch32 interworking is not supported. If you use an AArch64
kernel you are restricted to AArch64 user-mode binaries. This will be addressed
in a later patch.

Note: Virtualization is only supported in AArch32 mode. This will also be fixed
in a later patch.

Contributors:
Giacomo Gabrielli    (TrustZone, LPAE, system-level AArch64, AArch64 NEON, validation)
Thomas Grocutt       (AArch32 Virtualization, AArch64 FP, validation)
Mbou Eyole           (AArch64 NEON, validation)
Ali Saidi            (AArch64 Linux support, code integration, validation)
Edmund Grimley-Evans (AArch64 FP)
William Wang         (AArch64 Linux support)
Rene De Jong         (AArch64 Linux support, performance opt.)
Matt Horsnell        (AArch64 MP, validation)
Matt Evans           (device models, code integration, validation)
Chris Adeniyi-Jones  (AArch64 syscall-emulation)
Prakash Ramrakhyani  (validation)
Dam Sunwoo           (validation)
Chander Sudanthi     (validation)
Stephan Diestelhorst (validation)
Andreas Hansson      (code integration, performance opt.)
Eric Van Hensbergen  (performance opt.)
Gabe Black
2014-01-24 15:29:34 -06:00
Ali Saidi
f3585c841e stats: update stats for cache occupancy and clock domain changes 2014-01-24 15:29:33 -06:00
Andreas Hansson
cfc4a99982 arch: Make all register index flattening const
This patch makes all the register index flattening methods const for
all the ISAs. As part of this, readMiscRegNoEffect for ARM is also
made const.
2014-01-24 15:29:30 -06:00
Geoffrey Blake
9633282fc8 checker: CheckerCPU handling of MiscRegs was incorrect
The CheckerCPU model in pre-v8 code was not checking the
updates to miscellaneous registers due to some methods
for setting misc regs were not instrumented.  The v8 patches
exposed this by calling the instrumented misc reg update
methods and then invoking the checker before the main CPU had
updated its misc regs, leading to false positives about
register mismatches. This patch fixes the non-instrumented
misc reg update methods and places calls to the checker in
the proper places in the O3 model.
2014-01-24 15:29:30 -06:00
Ali Saidi
7d0344704a arch, cpu: Add support for flattening misc register indexes.
With ARMv8 support the same misc register id  results in accessing different
registers depending on the current mode of the processor. This patch adds
the same orthogonality to the misc register file as the others (int, float, cc).
For all the othre ISAs this is currently a null-implementation.

Additionally, a system variable is added to all the ISA objects.
2014-01-24 15:29:30 -06:00
Giacomo Gabrielli
3436de0c2a cpu: Add support for Memory+Barrier instruction types in O3 cpu. 2014-01-24 15:29:30 -06:00
Ali Saidi
90b1775a8f cpu: Add support for instructions that zero cache lines. 2014-01-24 15:29:30 -06:00
Ali Saidi
6bed6e0352 cpu: Add CPU support for generatig wake up events when LLSC adresses are snooped.
This patch add support for generating wake-up events in the CPU when an address
that is currently in the exclusive state is hit by a snoop. This mechanism is required
for ARMv8 multi-processor support.
2014-01-24 15:29:30 -06:00
Giacomo Gabrielli
d3444c6603 mem: Add flag to request if it was generated by a page table walk 2014-01-24 15:29:30 -06:00
Giacomo Gabrielli
aefe9cc624 mem: Add support for a security bit in the memory system
This patch adds the basic building blocks required to support e.g. ARM
TrustZone by discerning secure and non-secure memory accesses.
2014-01-24 15:29:30 -06:00
Chris Adeniyi-Jones
7f835a59f1 sim: Add openat/fstatat syscalls and fix mremap
This patch adds support for the openat and fstatat syscalls and
broadens the support for mremap to make it work on OS X.
2014-01-24 15:29:30 -06:00
Ali Saidi
904872a01a mem: Remove explict cast from memhelper.
Previously we were casting the result type to the the memory type which
is incorrect for things like dual-memory operations which still return a
single result.
2014-01-24 15:29:30 -06:00
Timothy M. Jones
427ceb57a9 Cache: Collect very basic stats on tag and data accesses
Adds very basic statistics on the number of tag and data accesses within the
cache, which is important for power modelling.  For the tags, simply count
the associativity of the cache each time.  For the data, this depends on
whether tags and data are accessed sequentially, which is given by a new
parameter.  In the parallel case, all data blocks are accessed each time, but
with sequential accesses, a single data block is accessed only on a hit.
2014-01-24 15:29:30 -06:00
Dam Sunwoo
85e8779de7 mem: per-thread cache occupancy and per-block ages
This patch enables tracking of cache occupancy per thread along with
ages (in buckets) per cache blocks.  Cache occupancy stats are
recalculated on each stat dump.
2014-01-24 15:29:30 -06:00
Matt Horsnell
739c6df94e base: add support for probe points and common probes
The probe patch is motivated by the desire to move analytical and trace code
away from functional code. This is achieved by the probe interface which is
essentially a glorified observer model.

What this means to users:
* add a probe point and a "notify" call at the source of an "event"
* add an isolated module, that is being used to carry out *your* analysis (e.g. generate a trace)
* register that module as a probe listener
Note: an example is given for reference in src/cpu/o3/simple_trace.[hh|cc] and src/cpu/SimpleTrace.py

What is happening under the hood:
* every SimObject maintains has a ProbeManager.
* during initialization (src/python/m5/simulate.py) first regProbePoints and
  the regProbeListeners is called on each SimObject.  this hooks up the probe
  point notify calls with the listeners.

FAQs:
Why did you develop probe points:
* to remove trace, stats gathering, analytical code out of the functional code.
* the belief that probes could be generically useful.

What is a probe point:
* a probe point is used to notify upon a given event (e.g. cpu commits an instruction)

What is a probe listener:
* a class that handles whatever the user wishes to do when they are notified
  about an event.

What can be passed on notify:
* probe points are templates, and so the user can generate probes that pass any
  type of argument (by const reference) to a listener.

What relationships can be generated (1:1, 1:N, N:M etc):
* there isn't a restriction. You can hook probe points and listeners up in a
  1:1, 1:N, N:M relationship. They become useful when a number of modules
  listen to the same probe points. The idea being that you can add a small
  number of probes into the source code and develop a larger number of useful
  analysis modules that use information passed by the probes.

Can you give examples:
* adding a probe point to the cpu's commit method allows you to build a trace
  module (outputting assembler), you could re-use this to gather instruction
  distribution (arithmetic, load/store, conditional, control flow) stats.

Why is the probe interface currently restricted to passing a const reference:
* the desire, initially at least, is to allow an interface to observe
  functionality, but not to change functionality.
* of course this can be subverted by const-casting.

What is the performance impact of adding probes:
* when nothing is actively listening to the probes they should have a
  relatively minor impact. Profiling has suggested even with a large number of
  probes (60) the impact of them (when not active) is very minimal (<1%).
2014-01-24 15:29:30 -06:00
Andreas Hansson
4de69821e6 sim: Expose the current voltage for each object as a stat 2014-01-24 15:29:30 -06:00
Andreas Hansson
1d85e914a6 sim: Expose the current clock period as a stat
This patch adds observability to the clock period of the clock domains
by including it as a stat.

As a result of adding this, the regressions will be updated in a
separate patch.
2014-01-24 15:29:30 -06:00
Matt Horsnell
ca89eba79e mem: track per-request latencies and access depths in the cache hierarchy
Add some values and methods to the request object to track the translation
and access latency for a request and which level of the cache hierarchy responded
to the request.
2014-01-24 15:29:30 -06:00
Andreas Hansson
daa781d2db config: Make the Clock a Tick parameter like Latency/Frequency
This patch makes the Clock a TickParamValue just like
Latency/Frequency. There is no longer any need to distinguish it
(originally needed to support multiplication).
2014-01-24 15:29:29 -06:00
Andreas Hansson
f2b0b551cc x86: Fix memory leak in table walker
This patch fixes a memory leak in the table walker, by ensuring that
the sender state is deleted again if the request packet cannot be
successfully sent.
2014-01-24 15:29:29 -06:00
Andreas Hansson
7db542c0dd cpu: Relax check on squashed non-speculative instructions
This patch relaxes the check performed when squashing non-speculative
instructions, as it caused problems with loads that were marked ready,
and then stalled on a blocked cache. The assertion is now allowing
memory references to be non-faulting.
2014-01-24 15:29:29 -06:00
Dam Sunwoo
6019d73db4 util: updated Streamline flow to support ARM DS-5 v5.17 protocol
The previous flow supported ARM DS-5 v5.13 protocol.
2014-01-24 15:29:29 -06:00
Dam Sunwoo
f1cd6b1ba8 cpu: remove faulty simpoint basic block inst count assertion
This patch removes an assertion in the simpoint profiling code that
asserts that a previously-seen basic block has the exact same number
of instructions executed as before. This can be false if the basic
block generates aborts or takes interrupts at different locations
within the basic block. The basic block profiling are not affected
significantly as these events are rare in general.
2014-01-24 15:29:29 -06:00
Nilay Vaish
37433d91a3 ruby: remove unused label no_vector 2014-01-17 11:02:15 -06:00
Nilay Vaish
fc6d1f3399 stats: updates due to changes to ruby 2014-01-10 16:19:58 -06:00
Nilay Vaish
407f37e15f ruby: move all statistics to stats.txt, eliminate ruby.stats 2014-01-10 16:19:47 -06:00
Nilay Vaish
cfe912a512 stats: add function for adding two histograms
This patch adds a function to the HistStor class for adding two histograms.
This functionality is required for Ruby.  It also adds support for printing
histograms in a single line.
2014-01-10 16:19:40 -06:00
Nilay Vaish
0387281e2a ruby: fix bug introduced to revision 8523754f8885 2014-01-09 10:45:50 -06:00
Nilay Vaish
8559081648 ruby: slicc: remove variable 'addr' used in calls to doTransition
This variable causes trouble if a variable of same name is declared in a
protocol file. Hence it is being eliminated.
2014-01-08 04:26:25 -06:00
Nilay Vaish
4070b00875 ruby: add a three level MESI protocol.
The first two levels (L0, L1) are private to the core, the third level (L2)is
possibly shared. The protocol supports clustered designs.  For example, one
can have two sets of two cores. Each core has an L0 and L1 cache. There are
two L2 controllers where each set accesses only one of the L2 controllers.
2014-01-04 00:03:34 -06:00
Nilay Vaish
bb6d7d402b ruby: rename MESI_CMP_directory to MESI_Two_Level
This is because the next patch introduces a three level hierarchy.

--HG--
rename : build_opts/ALPHA_MESI_CMP_directory => build_opts/ALPHA_MESI_Two_Level
rename : build_opts/X86_MESI_CMP_directory => build_opts/X86_MESI_Two_Level
rename : configs/ruby/MESI_CMP_directory.py => configs/ruby/MESI_Two_Level.py
rename : src/mem/protocol/MESI_CMP_directory-L1cache.sm => src/mem/protocol/MESI_Two_Level-L1cache.sm
rename : src/mem/protocol/MESI_CMP_directory-L2cache.sm => src/mem/protocol/MESI_Two_Level-L2cache.sm
rename : src/mem/protocol/MESI_CMP_directory-dir.sm => src/mem/protocol/MESI_Two_Level-dir.sm
rename : src/mem/protocol/MESI_CMP_directory-dma.sm => src/mem/protocol/MESI_Two_Level-dma.sm
rename : src/mem/protocol/MESI_CMP_directory-msg.sm => src/mem/protocol/MESI_Two_Level-msg.sm
rename : src/mem/protocol/MESI_CMP_directory.slicc => src/mem/protocol/MESI_Two_Level.slicc
rename : tests/long/fs/10.linux-boot/ref/x86/linux/pc-simple-timing-ruby-MESI_CMP_directory/config.ini => tests/long/fs/10.linux-boot/ref/x86/linux/pc-simple-timing-ruby-MESI_Two_Level/config.ini
rename : tests/long/fs/10.linux-boot/ref/x86/linux/pc-simple-timing-ruby-MESI_CMP_directory/ruby.stats => tests/long/fs/10.linux-boot/ref/x86/linux/pc-simple-timing-ruby-MESI_Two_Level/ruby.stats
rename : tests/long/fs/10.linux-boot/ref/x86/linux/pc-simple-timing-ruby-MESI_CMP_directory/simerr => tests/long/fs/10.linux-boot/ref/x86/linux/pc-simple-timing-ruby-MESI_Two_Level/simerr
rename : tests/long/fs/10.linux-boot/ref/x86/linux/pc-simple-timing-ruby-MESI_CMP_directory/simout => tests/long/fs/10.linux-boot/ref/x86/linux/pc-simple-timing-ruby-MESI_Two_Level/simout
rename : tests/long/fs/10.linux-boot/ref/x86/linux/pc-simple-timing-ruby-MESI_CMP_directory/stats.txt => tests/long/fs/10.linux-boot/ref/x86/linux/pc-simple-timing-ruby-MESI_Two_Level/stats.txt
rename : tests/long/fs/10.linux-boot/ref/x86/linux/pc-simple-timing-ruby-MESI_CMP_directory/system.pc.com_1.terminal => tests/long/fs/10.linux-boot/ref/x86/linux/pc-simple-timing-ruby-MESI_Two_Level/system.pc.com_1.terminal
rename : tests/quick/se/00.hello/ref/alpha/linux/simple-timing-ruby-MESI_CMP_directory/config.ini => tests/quick/se/00.hello/ref/alpha/linux/simple-timing-ruby-MESI_Two_Level/config.ini
rename : tests/quick/se/00.hello/ref/alpha/linux/simple-timing-ruby-MESI_CMP_directory/ruby.stats => tests/quick/se/00.hello/ref/alpha/linux/simple-timing-ruby-MESI_Two_Level/ruby.stats
rename : tests/quick/se/00.hello/ref/alpha/linux/simple-timing-ruby-MESI_CMP_directory/simerr => tests/quick/se/00.hello/ref/alpha/linux/simple-timing-ruby-MESI_Two_Level/simerr
rename : tests/quick/se/00.hello/ref/alpha/linux/simple-timing-ruby-MESI_CMP_directory/simout => tests/quick/se/00.hello/ref/alpha/linux/simple-timing-ruby-MESI_Two_Level/simout
rename : tests/quick/se/00.hello/ref/alpha/linux/simple-timing-ruby-MESI_CMP_directory/stats.txt => tests/quick/se/00.hello/ref/alpha/linux/simple-timing-ruby-MESI_Two_Level/stats.txt
rename : tests/quick/se/00.hello/ref/alpha/tru64/simple-timing-ruby-MESI_CMP_directory/config.ini => tests/quick/se/00.hello/ref/alpha/tru64/simple-timing-ruby-MESI_Two_Level/config.ini
rename : tests/quick/se/00.hello/ref/alpha/tru64/simple-timing-ruby-MESI_CMP_directory/ruby.stats => tests/quick/se/00.hello/ref/alpha/tru64/simple-timing-ruby-MESI_Two_Level/ruby.stats
rename : tests/quick/se/00.hello/ref/alpha/tru64/simple-timing-ruby-MESI_CMP_directory/simerr => tests/quick/se/00.hello/ref/alpha/tru64/simple-timing-ruby-MESI_Two_Level/simerr
rename : tests/quick/se/00.hello/ref/alpha/tru64/simple-timing-ruby-MESI_CMP_directory/simout => tests/quick/se/00.hello/ref/alpha/tru64/simple-timing-ruby-MESI_Two_Level/simout
rename : tests/quick/se/00.hello/ref/alpha/tru64/simple-timing-ruby-MESI_CMP_directory/stats.txt => tests/quick/se/00.hello/ref/alpha/tru64/simple-timing-ruby-MESI_Two_Level/stats.txt
rename : tests/quick/se/50.memtest/ref/alpha/linux/memtest-ruby-MESI_CMP_directory/config.ini => tests/quick/se/50.memtest/ref/alpha/linux/memtest-ruby-MESI_Two_Level/config.ini
rename : tests/quick/se/50.memtest/ref/alpha/linux/memtest-ruby-MESI_CMP_directory/ruby.stats => tests/quick/se/50.memtest/ref/alpha/linux/memtest-ruby-MESI_Two_Level/ruby.stats
rename : tests/quick/se/50.memtest/ref/alpha/linux/memtest-ruby-MESI_CMP_directory/simerr => tests/quick/se/50.memtest/ref/alpha/linux/memtest-ruby-MESI_Two_Level/simerr
rename : tests/quick/se/50.memtest/ref/alpha/linux/memtest-ruby-MESI_CMP_directory/simout => tests/quick/se/50.memtest/ref/alpha/linux/memtest-ruby-MESI_Two_Level/simout
rename : tests/quick/se/50.memtest/ref/alpha/linux/memtest-ruby-MESI_CMP_directory/stats.txt => tests/quick/se/50.memtest/ref/alpha/linux/memtest-ruby-MESI_Two_Level/stats.txt
rename : tests/quick/se/60.rubytest/ref/alpha/linux/rubytest-ruby-MESI_CMP_directory/config.ini => tests/quick/se/60.rubytest/ref/alpha/linux/rubytest-ruby-MESI_Two_Level/config.ini
rename : tests/quick/se/60.rubytest/ref/alpha/linux/rubytest-ruby-MESI_CMP_directory/ruby.stats => tests/quick/se/60.rubytest/ref/alpha/linux/rubytest-ruby-MESI_Two_Level/ruby.stats
rename : tests/quick/se/60.rubytest/ref/alpha/linux/rubytest-ruby-MESI_CMP_directory/simerr => tests/quick/se/60.rubytest/ref/alpha/linux/rubytest-ruby-MESI_Two_Level/simerr
rename : tests/quick/se/60.rubytest/ref/alpha/linux/rubytest-ruby-MESI_CMP_directory/simout => tests/quick/se/60.rubytest/ref/alpha/linux/rubytest-ruby-MESI_Two_Level/simout
rename : tests/quick/se/60.rubytest/ref/alpha/linux/rubytest-ruby-MESI_CMP_directory/stats.txt => tests/quick/se/60.rubytest/ref/alpha/linux/rubytest-ruby-MESI_Two_Level/stats.txt
2014-01-04 00:03:33 -06:00
Nilay Vaish
9ec59e8b69 ruby: remove cntrl_id from python config scripts. 2014-01-04 00:03:32 -06:00