I need to clean a victim block from the cache instead of evicting it from the
last level of the cache (LLC). my objective is to write the block to the main
memory without removing it from the LLC.
To achieve this, I have identified the writecleanBlk() function within the base
cache class as a solution. This function is responsible for creating a write
clean request for a given block. Subsequently, I want to utilize the
doWritebacks() function to insert the generated writebacks into the write
buffer.
Considering the code snippet provided below, I kindly request your expertise in
reviewing the correctness of calling the writecleanBlk() function:
\
`CacheBlk *BaseCache::allocateBlock(const PacketPtr pkt, PacketList
&writebacks)`
`{`
` // Get address`
` const Addr addr = pkt->getAddr();`
` // Get secure bit`
` const bool is_secure = pkt->isSecure();`
` // ...`
` // Find replacement victim`
` std::vector<CacheBlk*> evict_blks;`
` CacheBlk *victim = tags->findVictim(addr, is_secure, blk_size_bits,
evict_blks);`
` if (victim && victim->isSet(CacheBlk::DirtyBit)) {`
` PacketPtr wb_pkt = writecleanBlk(victim, pkt->re->getDest(), pkt->id);`
` writebacks.push_back(wb_pkt);`
` PacketList writebacks;`
` doWritebacks(writebacks, 0);`
` }`
` // ...`
` // Custom replacement algorithm`
` // ...`
`}`\
\
My primary concern is to ensure that the writecleanBlk() function effectively
writes the dirty block from the last-level memory to the main memory, without
evicting it from the current cache. Could you please confirm if this function
aligns with my intended behavior?
Additionally, when running gem5, I encounter the following warning message
(Execution ends without error):
"bild/ARM/arch/arm/regs/misc.cc:524: warn:CP14 unimplemented crn\[15\],
opc1\[7\], CRM\[4\], opc2\[5\]"
However, it appears that the changes I have made are not being applied
correctly. I would greatly appreciate your insights on this matter and any
suggestions to resolve the issue.
Thank you for your time and assistance.
Best regards,
Zahra Moein
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