diff options
| author | Brad Beckmann <Brad.Beckmann@amd.com> | 2010-08-20 11:46:13 -0700 |
|---|---|---|
| committer | Brad Beckmann <Brad.Beckmann@amd.com> | 2010-08-20 11:46:13 -0700 |
| commit | 72044e3f5a5b9455e07180806793127be2014451 (patch) | |
| tree | fe2e7f7f129a31dccf84ee2d0bfc93d9c76b7f07 /configs/ruby | |
| parent | bcdd19df03ed047e4ce03dbf81bc40173cc3217b (diff) | |
| download | gem5-72044e3f5a5b9455e07180806793127be2014451.tar.xz | |
ruby: Disable migratory sharing for token and hammer
This patch allows one to disable migratory sharing for those cache blocks that
are accessed by atomic requests. While the implementations are different
between the token and hammer protocols, the motivation is the same. For
Alpha, LLSC semantics expect that normal loads do not unlock cache blocks that
have been locked by LL accesses. Therefore, locked blocks should not transfer
write permissions when responding to these load requests. Instead, only they
only transfer read permissions so that the subsequent SC access can possibly
succeed.
Diffstat (limited to 'configs/ruby')
| -rw-r--r-- | configs/ruby/MOESI_CMP_token.py | 8 | ||||
| -rw-r--r-- | configs/ruby/MOESI_hammer.py | 7 |
2 files changed, 11 insertions, 4 deletions
diff --git a/configs/ruby/MOESI_CMP_token.py b/configs/ruby/MOESI_CMP_token.py index 3853ebbb4..ef110d682 100644 --- a/configs/ruby/MOESI_CMP_token.py +++ b/configs/ruby/MOESI_CMP_token.py @@ -51,7 +51,9 @@ def define_options(parser): help="Token_CMP: cycles until issuing again"); parser.add_option("--disable-dyn-timeouts", action="store_true", help="Token_CMP: disable dyanimc timeouts, use fixed latency instead") - + parser.add_option("--allow-atomic-migration", action="store_true", + help="allow migratory sharing for atomic only accessed blocks") + def create_system(options, system, piobus, dma_devices): if buildEnv['PROTOCOL'] != 'MOESI_CMP_token': @@ -111,7 +113,9 @@ def create_system(options, system, piobus, dma_devices): fixed_timeout_latency = \ options.timeout_latency, dynamic_timeout_enabled = \ - not options.disable_dyn_timeouts) + not options.disable_dyn_timeouts, + no_mig_atomic = not \ + options.allow_atomic_migration) exec("system.l1_cntrl%d = l1_cntrl" % i) # diff --git a/configs/ruby/MOESI_hammer.py b/configs/ruby/MOESI_hammer.py index 818600a5a..02d958b09 100644 --- a/configs/ruby/MOESI_hammer.py +++ b/configs/ruby/MOESI_hammer.py @@ -44,7 +44,8 @@ class L2Cache(RubyCache): latency = 10 def define_options(parser): - return + parser.add_option("--allow-atomic-migration", action="store_true", + help="allow migratory sharing for atomic only accessed blocks") def create_system(options, system, piobus, dma_devices): @@ -91,7 +92,9 @@ def create_system(options, system, piobus, dma_devices): sequencer = cpu_seq, L1IcacheMemory = l1i_cache, L1DcacheMemory = l1d_cache, - L2cacheMemory = l2_cache) + L2cacheMemory = l2_cache, + no_mig_atomic = not \ + options.allow_atomic_migration) exec("system.l1_cntrl%d = l1_cntrl" % i) # |