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-rw-r--r--src/mem/cache/cache_impl.hh13
1 files changed, 12 insertions, 1 deletions
diff --git a/src/mem/cache/cache_impl.hh b/src/mem/cache/cache_impl.hh
index 115e7aeb8..cb02f7558 100644
--- a/src/mem/cache/cache_impl.hh
+++ b/src/mem/cache/cache_impl.hh
@@ -1197,6 +1197,15 @@ Cache<TagStore>::recvTimingResp(PacketPtr pkt)
if (wasFull && !mq->isFull()) {
clearBlocked((BlockedCause)mq->index);
}
+
+ // Request the bus for a prefetch if this deallocation freed enough
+ // MSHRs for a prefetch to take place
+ if (prefetcher && mq == &mshrQueue && mshrQueue.canPrefetch()) {
+ Tick next_pf_time = std::max(prefetcher->nextPrefetchReadyTime(),
+ curTick());
+ if (next_pf_time != MaxTick)
+ requestMemSideBus(Request_PF, next_pf_time);
+ }
}
// copy writebacks to write buffer
@@ -1955,7 +1964,9 @@ Cache<TagStore>::nextMSHRReadyTime() const
Tick nextReady = std::min(mshrQueue.nextMSHRReadyTime(),
writeBuffer.nextMSHRReadyTime());
- if (prefetcher) {
+ // Don't signal prefetch ready time if no MSHRs available
+ // Will signal once enoguh MSHRs are deallocated
+ if (prefetcher && mshrQueue.canPrefetch()) {
nextReady = std::min(nextReady,
prefetcher->nextPrefetchReadyTime());
}