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1. 发明申请

WO2007031696A1 CACHE MISS DETECTION IN A DATA PROCESSING APPARATUS 审中-公开
标题翻译：数据处理设备中的高速缓存检测
公开(公告)号：WO2007031696A1
公开(公告)日：2007-03-22
申请号：PCT/GB2005/003531
申请日：2005-09-13
申请人： ARM LIMITED , GHOSH, Mrinmoy , ÖZER, Emre , BILES, Stuard, David
发明人： GHOSH, Mrinmoy , ÖZER, Emre , BILES, Stuard, David
IPC分类号： G06F12/08 , G06F9/38
CPC分类号： G06F9/3851 , G06F9/383 , G06F12/0802 , G06F12/0897
摘要： A data processing apparatus and method are provided for detecting cache misses. The data processing apparatus has processing logic for executing a plurality of program threads, and a cache for storing data values for access by the processing logic. When access to a data value is required while executing a first program thread, the processing logic issues an access request specifying an address in memory associated with that data value, and the cache is responsive to the address to perform a lookup procedure to determine whether the data value is stored in the cache. Indication logic is provided which in response to an address portion of the address provides an indication as to whether the data value is stored in the cache, this indication being produced before a result of the lookup procedure is available, and the indication logic only issuing an indication that the data value is not stored in the cache if that indication is guaranteed to be correct. Control logic is then provided which, if the indication indicates that the data value is not stored in the cache, uses that indication to control a process having an effect on a program thread other than the first program thread.
摘要翻译：提供了一种用于检测高速缓存未命中的数据处理装置和方法。数据处理装置具有用于执行多个程序线程的处理逻辑，以及用于存储由处理逻辑进行访问的数据值的高速缓存。当执行第一程序线程时需要访问数据值时，处理逻辑发出指定与该数据值相关联的存储器中的地址的访问请求，并且高速缓冲存储器响应于地址执行查找过程以确定是否数据值存储在缓存中。指示逻辑被提供，其响应于地址的地址部分提供关于数据值是否存储在高速缓存中的指示，该指示是在查找过程的结果可用之前产生的，并且指示逻辑仅发出指示如果该指示保证正确，则数据值不存储在高速缓存中。然后提供控制逻辑，如果该指示指示数据值未被存储在高速缓存中，则使用该指示来控制对除第一程序线程之外的程序线程有影响的进程。

2. 发明申请

WO2007101969A1 ACCESSING A CACHE IN A DATA PROCESSING APPARATUS 审中-公开
标题翻译：在数据处理设备中访问缓存
公开(公告)号：WO2007101969A1
公开(公告)日：2007-09-13
申请号：PCT/GB2006/000795
申请日：2006-03-06
申请人： ARM LIMITED , FORD, Simon, Andrew , GHOSH, Mrinmoy , ÖZER, Emre , BILES, Stuart, David
发明人： FORD, Simon, Andrew , GHOSH, Mrinmoy , ÖZER, Emre , BILES, Stuart, David
IPC分类号： G06F12/08
CPC分类号： G06F12/0864 , G06F2212/1016 , G06F2212/6032 , Y02D10/13
摘要： A data processing apparatus is provided having processing logic for performing a sequence of operations, and a cache having a plurality of segments for storing data values for access by the processing logic. The processing logic is arranged, when access to a data value is required, to issue an access request specifying an address in memory associated with that data value, and the cache is responsive to the address to perform a lookup procedure during which it is determined whether the data value is stored in the cache. Indication logic is provided which, in response to an address portion of the address, provides for each of at least a subject of the segments an indication as to whether the data value is stored in that segment. The indication logic has guardian storage for storing guarding data, and hash logic for performing a hash operation on the address portion in order to reference the guarding data to determine each indication. Each indication indicates whether the data value is either definitely not stored in the associated segment or is potentially stored with the associated segment, and the cache is then operable to use the indications produced by the indication logic to affect the lookup procedure performed in respect of any segment whose associated indication indicates that the data value is definitely not stored in that segment. This technique has been found to provide a particularly power efficient mechanism for accessing the cache.
摘要翻译：提供了具有用于执行操作序列的处理逻辑的数据处理装置，以及具有多个段的高速缓存，用于存储由处理逻辑进行访问的数据值。当需要访问数据值时，处理逻辑被布置为发出指定与该数据值相关联的存储器中的地址的访问请求，并且高速缓存响应于地址以执行查找过程，在此期间确定是否确定是否数据值存储在缓存中。提供指示逻辑，响应于地址的地址部分，为段中的至少一个对象提供关于数据值是否存储在该段中的指示。指示逻辑具有用于存储保护数据的保护存储和用于对地址部分执行散列操作的散列逻辑，以引用保护数据来确定每个指示。每个指示指示数据值是否绝对不存储在相关联的段中或潜在地与相关联的段相关联，并且高速缓存然后可操作以使用由指示逻辑产生的指示来影响关于任何其相关联的指示表明数据值绝对不存储在该段中。已经发现这种技术提供了用于访问高速缓存的特别有效的机构。

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