Hi all,
We want to re-insert the evicted block from lru position into mru depending
on contextSrc (assumed to be cpu-id).
Assuming 4 cpus, cpu-id= 0,1,2,3
if contextSrc=0/1 , the block is inserted into mru of the same set, else it
is to be discarded.
We updated lru.cc as follows
-------------------------------------------------------------------------------------------
LRU::findVictim(Addr addr, PacketList &writebacks)
{
int flag=0;
unsigned set = extractSet(addr);
// grab a replacement candidate
BlkType *blk;
while(flag==0)
{
blk = sets[set].blks[assoc-1];
if (blk->isValid())
{
replacements[0]++;
totalRefs += blk->refCount;
++sampledRefs;
blk->refCount = 0;
// deal with evicted block
if(blk->contextSrc!=-1)
{
//for spiller caches
if(blk->contextSrc== 0 || blk->contextSrc==1)
{
insertBlock(addr,blk, blk->contextSrc);
flag=0;
}
// for reciever caches
else
{
occupancies[blk->contextSrc % cache->numCpus()]--;
blk->contextSrc = -1;
flag=1;
// flag is set if contexsrc = 2/3
}
}
else
{
occupancies[cache->numCpus()]--;
flag=1;
}
}
else
flag=1;
DPRINTF(CacheRepl, "set %x: selecting blk %x for replacement\n",
set, regenerateBlkAddr(blk->tag, set));
}// while end
return blk;
}
------------------------------------------------------------------------------------------------------------------------------
we wanted to see the contents of the cache set , so added printing
statements as follows in cacheset.cc
---------------------------------------------------------------------------------------------------------------------------------
void
CacheSet::moveToHead(CacheBlk *blk)
{
// nothing to do if blk is already head
if (blks[0] == blk)
return;
// write 'next' block into blks[i], moving up from MRU toward LRU
// until we overwrite the block we moved to head.
// start by setting up to write 'blk' into blks[0]
int i = 0;
CacheBlk *next = blk;
inform("before insertion\n");
for(int i=0;i<assoc;i++)
inform("blocks[%d] = %x,",i,blks[i]);
i=0;
do {
assert(i < assoc);
// swap blks[i] and next
CacheBlk *tmp = blks[i];
blks[i] = next;
next = tmp;
++i;
} while (next != blk);
inform("After insertion\n");
for(int i=0;i<assoc;i++)
inform("blocks[%d] = %x,",i,blks[i]);
}
But for the same set we saw the following status
info: before insertion
info: blocks[0] = 0xa552684,
info: blocks[1] = 0xa5526bc,
info: blocks[2] = 0xa5526f4,
info: blocks[3] = 0xa55272c,
info: blocks[4] = 0xa552764,
info: blocks[5] = 0xa55279c,
info: blocks[6] = 0xa5527d4,
info: blocks[7] = 0xa55280c,
info: after insertion
info: blocks[0] = 0xa55280c,
info: blocks[1] = 0xa552684,
info: blocks[2] = 0xa5526bc,
info: blocks[3] = 0xa5526f4,
info: blocks[4] = 0xa55272c,
info: blocks[5] = 0xa552764,
info: blocks[6] = 0xa55279c,
info: blocks[7] = 0xa5527d4,
info: before insertion
info: blocks[0] = 0xa5fd284,
For the same set, block[0] shows two different value...why?
--
Sunitha.P
9092892876
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