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mem-ruby: Use check_on_cache_probe to protect locked lines from eviction

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This change uses check_on_cache_probe statement to check if the cacheline
subject to eviction is locked in MESI Two Level. Other protocols should
be updated accordingly.

Signed-off-by: Pouya Fotouhi <pfotouhi@ucdavis.edu>
Change-Id: Idcdbc8ee528eb5e4e2f8d56a268a3a92eadd95b1
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/16809
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>
Tested-by: kokoro <noreply+kokoro@google.com>
This commit is contained in:
Pouya Fotouhi
2019-02-27 13:47:57 -08:00
parent fd95c68485
commit e424be8281
1 changed files with 16 additions and 6 deletions
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22
src/mem/protocol/MESI_Two_Level-L1cache.sm
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@@ -472,9 +472,14 @@ machine(MachineType:L1Cache, "MESI Directory L1 Cache CMP")
L1Icache_entry, TBEs[in_msg.LineAddress]);
} else {
// No room in the L1, so we need to make room in the L1
trigger(Event:L1_Replacement, L1Icache.cacheProbe(in_msg.LineAddress),
getL1ICacheEntry(L1Icache.cacheProbe(in_msg.LineAddress)),
TBEs[L1Icache.cacheProbe(in_msg.LineAddress)]);
// Check if the line we want to evict is not locked
Addr addr := L1Icache.cacheProbe(in_msg.LineAddress);
check_on_cache_probe(mandatoryQueue_in, addr);
trigger(Event:L1_Replacement, addr,
getL1ICacheEntry(addr),
TBEs[addr]);
}
}
} else {
@@ -502,9 +507,14 @@ machine(MachineType:L1Cache, "MESI Directory L1 Cache CMP")
L1Dcache_entry, TBEs[in_msg.LineAddress]);
} else {
// No room in the L1, so we need to make room in the L1
trigger(Event:L1_Replacement, L1Dcache.cacheProbe(in_msg.LineAddress),
getL1DCacheEntry(L1Dcache.cacheProbe(in_msg.LineAddress)),
TBEs[L1Dcache.cacheProbe(in_msg.LineAddress)]);
// Check if the line we want to evict is not locked
Addr addr := L1Dcache.cacheProbe(in_msg.LineAddress);
check_on_cache_probe(mandatoryQueue_in, addr);
trigger(Event:L1_Replacement, addr,
getL1DCacheEntry(addr),
TBEs[addr]);
}
}
}