From 0c29a97ba90b6416014efee232efd9fea2f974d6 Mon Sep 17 00:00:00 2001 From: Ali Saidi Date: Tue, 13 Sep 2011 12:06:13 -0500 Subject: Prefetch: Don't prefetch if address is in the write queue. Check that we're not currently writing back an address the prefetcher is trying to prefetch before issuing it. We previously checked the mshrQueue and the cache itself, but forgot to check the writeBuffer. This fixes a memory corrucption issue with an L2 prefetcher. --- src/mem/cache/cache_impl.hh | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'src/mem/cache') diff --git a/src/mem/cache/cache_impl.hh b/src/mem/cache/cache_impl.hh index b29d52f78..a56495abb 100644 --- a/src/mem/cache/cache_impl.hh +++ b/src/mem/cache/cache_impl.hh @@ -1437,7 +1437,8 @@ Cache::getNextMSHR() PacketPtr pkt = prefetcher->getPacket(); if (pkt) { Addr pf_addr = blockAlign(pkt->getAddr()); - if (!tags->findBlock(pf_addr) && !mshrQueue.findMatch(pf_addr)) { + if (!tags->findBlock(pf_addr) && !mshrQueue.findMatch(pf_addr) && + !writeBuffer.findMatch(pf_addr)) { // Update statistic on number of prefetches issued // (hwpf_mshr_misses) mshr_misses[pkt->cmdToIndex()][0/*pkt->req->threadId()*/]++; -- cgit v1.2.3