From 516e6046aefd486768d03ba9c58db80e5ad3fff0 Mon Sep 17 00:00:00 2001 From: Curtis Dunham Date: Tue, 23 Dec 2014 09:31:19 -0500 Subject: [PATCH] mem: Hide WriteInvalidate requests from prefetchers Without this tweak, a prefetcher will happily prefetch data that will promptly be invalidated and overwritten by a WriteInvalidate. --- src/mem/cache/prefetch/base.cc | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/src/mem/cache/prefetch/base.cc b/src/mem/cache/prefetch/base.cc index 119397bb5..3ab2d76a6 100644 --- a/src/mem/cache/prefetch/base.cc +++ b/src/mem/cache/prefetch/base.cc @@ -83,7 +83,8 @@ BasePrefetcher::observeAccess(const PacketPtr &pkt) const { Addr addr = pkt->getAddr(); bool fetch = pkt->req->isInstFetch(); - bool read= pkt->isRead(); + bool read = pkt->isRead(); + bool inv = pkt->isInvalidate(); bool is_secure = pkt->isSecure(); if (pkt->req->isUncacheable()) return false; @@ -91,6 +92,7 @@ BasePrefetcher::observeAccess(const PacketPtr &pkt) const if (!fetch && !onData) return false; if (!fetch && read && !onRead) return false; if (!fetch && !read && !onWrite) return false; + if (!fetch && !read && inv) return false; if (onMiss) { return !inCache(addr, is_secure) && -- 2.30.2