Cache lockdown isalmost nevera good thing for performance for general purpose application code. Caches are nearly always smaller than the total overall code/data set on a platform. If you lock down 25% of the cache to accelerate one application, you effectively make the cache 25% smaller for ...
“锁定”在cache中的块在常规的cache替换操作中不会被替换,但当通过C7控制cache中特定的块时,比如使某特定的块无效时,这些被“锁定”在cache中的块也将受到相应的影响。 用LINELEN表示cache的块大小,用ASSOCIATIVITY表示每个cache组中的块数,用NSETS表示cache中的组数。 cache的“锁定”是以锁定块(lockdown block)...
一般来说cache的数据会不断的被替换的，如果需要长期不动，可以考虑用cache lockdown的功能。arm 的a9 l2就提供了lockdown的feature。不过cache都采用易失性的memory，断电以后里面的数据就会丢失的。
ICaches的replacemnet algorithm有两种,一种是Random模式另一种Round-Robin模式,我们可以通过CP15协处理器中寄存器1的RR bit对其进行指定(0 = Random replacement 1 = Round robin replacement),如果有需要你还可以进行指令锁定(INSTRUCTION CACHE LOCKDOWN)。 虚拟cache Cache 位于MMU前面靠近CPU称为逻辑CACHE又叫虚拟C...
cache的“锁定”是以锁定块(lockdown block)为单位进行的。每个锁定块中包括cache中每个组中各一个块,这样cache中最多可有ASSOCIATIVITY个锁定块,编号为0~ASSOCIATIVITY-1。其中编号为0的锁定块中包含cache组0中的0号块、组1中的0号块,一直到ASSOCIATIVITY-1中的0号块。 “N锁定块被锁定”是指编号为0~N-1的...
The Cache Lockdown Register is a read-write register. This register prevents new addresses being allocated and also prevents the data in the set ways from being evicted. It also enables the cache controller to filter data from instructions or data transactions. ...
cache的“锁定”是以锁定块(lockdown block)为单位进行的。每个锁定块中包括cache中每个组中各一个块,这样cache中最多可有ASSOCIATIVITY个锁定块,编号为0~ASSOCIATIVITY-1。 其中编号为0的锁定块中包含cache组0中的0号块、组1中的0号块,一直到ASSOCIATIVITY-1中的0号块。
Cache lockdown is a feature provided by some ARM cores. The lockdown feature allows code and data to be loaded into cache and marked as exempt from eviction. We also provided example code showing how to clean and flush ARM cached cores, and to lock code and data in cache. ...
Cache lockdown To fix a line in cache memory so that it cannot be overwritten. Cache lockdown enables critical instructions and/or data to be loaded into the cache so that the cache lines containing them are not subsequently reallocated. This ensures that all subsequent accesses to the instru...
每个锁定块(lockdown block)包括Cache每组中的一行。这样Cache中共有A个锁定块,其编号为从0到A-1。其中编号为0的锁定块中包含Cache组0中的0#行,组1中的0#行,直到组A-1中的0#行。依此类推,锁定块1包含Cache组0中的1#行,组1中的1#行,直到组A-1中的1#行。这样每个锁定块中包含了N个Cache行。