sanchayanmaity/gem5
1
0
Fork 0
Code Issues Pull requests Packages Projects Releases Wiki Activity

mem: Remove a redundant heap allocation for a snoop packet

Browse source 
This patch changes the updards snoop packet to avoid allocating and
later deleting it. As the code executes in 0 time and the lifetime of
the packet does not extend beyond the block there is no reason to heap
allocate it.
This commit is contained in:
Andreas Hansson 2013-06-27 05:49:49 -04:00
parent 9a1169f3d7
commit f330b3c28d
1 changed files with 11 additions and 12 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

23
src/mem/cache/cache_impl.hh vendored
View file

@ -1655,23 +1655,22 @@ Cache<TagStore>::getTimingPacket()
// that, and then we'll have to figure out what to do.
assert(blk == NULL);
// We need to check the caches above us to verify that they don't have
// a copy of this block in the dirty state at the moment. Without this
// check we could get a stale copy from memory that might get used
// in place of the dirty one.
PacketPtr snoop_pkt = new Packet(tgt_pkt, true);
snoop_pkt->setExpressSnoop();
snoop_pkt->senderState = mshr;
cpuSidePort->sendTimingSnoopReq(snoop_pkt);
// We need to check the caches above us to verify that
// they don't have a copy of this block in the dirty state
// at the moment. Without this check we could get a stale
// copy from memory that might get used in place of the
// dirty one.
Packet snoop_pkt(tgt_pkt, true);
snoop_pkt.setExpressSnoop();
snoop_pkt.senderState = mshr;
cpuSidePort->sendTimingSnoopReq(&snoop_pkt);
if (snoop_pkt->memInhibitAsserted()) {
markInService(mshr, snoop_pkt);
if (snoop_pkt.memInhibitAsserted()) {
markInService(mshr, &snoop_pkt);
DPRINTF(Cache, "Upward snoop of prefetch for addr %#x hit\n",
tgt_pkt->getAddr());
delete snoop_pkt;
return NULL;
}
delete snoop_pkt;
}
pkt = getBusPacket(tgt_pkt, blk, mshr->needsExclusive());