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For a transactional memory architecture, the snooping is unnecessary.
We mention the phrase Mechanical Sympathy quite a lot, in fact it's even Martin's blog title.
If you're asking why there isn't a store-by-cacheline-size instruction, cachelines vary and ISA's really shouldn't be built for implementation details.
You will, as Andrew mentioned, need to snoop the cacheline for the other CPU's.
Consider using L1 Cache Functions and L2C-310 Cache Controller Functions for cache maintenance instead of raw register usage.
A cache with a write-through policy (and write-allocate) read an entire block (cacheline) from memory on a cache miss and writes only the updated item to memory for a store. A cache with a write-back policy (and write-allocate) reads an entire block (cacheline) from memory on a cache miss, may need to write dirty cacheline first.
Technically, if you do a store-multiple of 0's to that 64 bytes of memory, you'll be doing essentially this.In benchmarks, we consider the following parameters and aspects: The design of atomics prevents any instruction-level parallelism even if there are no dependencies between the issued operations (in the paper, we discuss ways to alleviate it in future architectures).In our work, we illustrate that a simple performance model that takes into account the cache coherence state of the accessed cache line is enough to account for most performance results.Data held in internal caches is not written back to main memory.After executing this instruction, the processor does not wait for the external caches to complete their flushing oper-ation before proceeding with instruction execution.
It is the responsibility of hardware to respond to the cache flush signal. When the processor is running in protected mode, the CPL of a program or procedure must be 0 to execute this instruction.