公开(公告)号：US20110153931A1

公开(公告)日：2011-06-23

申请号：US12644721

申请日：2009-12-22

申请人： Robert H. Bell, JR. ,  Men-Chow Chiang ,  Hong L. Hua ,  Mysore S. Srinivas

发明人： Robert H. Bell, JR. ,  Men-Chow Chiang ,  Hong L. Hua ,  Mysore S. Srinivas

IPC分类号： G06F12/08

CPC分类号： G06F17/30082 ,  G06F3/0611 ,  G06F3/064 ,  G06F3/0647 ,  G06F3/0685

摘要： A storage subsystem combining solid state drive (SSD) and hard disk drive (HDD) technologies provides low access latency and low complexity. Separate free lists are maintained for the SSD and the HDD and blocks of file system data are stored uniquely on either the SSD or the HDD. When a read access is made to the subsystem, if the data is present on the SSD, the data is returned, but if the block is present on the HDD, it is migrated to the SSD and the block on the HDD is returned to the HDD free list. On a write access, if the block is present in the either the SSD or HDD, the block is overwritten, but if the block is not present in the subsystem, the block is written to the HDD.

摘要翻译： 组合固态硬盘（SSD）和硬盘驱动器（HDD）技术的存储子系统提供低访问延迟和低复杂度。 为SSD保留独立的免费列表，HDD和文件系统数据块可以唯一存储在SSD或HDD上。 当对子系统进行读取访问时，如果SSD上存在数据，则返回数据，但是如果该块存在于HDD上，则迁移到SSD，并将HDD上的块返回到 硬盘免费列表。 在写访问中，如果该块存在于SSD或HDD中，则该块被覆盖，但是如果块不存在于子系统中，则该块被写入HDD。

公开(公告)号：US08438334B2

公开(公告)日：2013-05-07

申请号：US12644721

申请日：2009-12-22

申请人： Robert H. Bell, Jr. ,  Men-Chow Chiang ,  Hong L. Hua ,  Mysore S. Srinivas

发明人： Robert H. Bell, Jr. ,  Men-Chow Chiang ,  Hong L. Hua ,  Mysore S. Srinivas

IPC分类号： G06F12/00 ,  G06F13/00 ,  G06F13/28

CPC分类号： G06F17/30082 ,  G06F3/0611 ,  G06F3/064 ,  G06F3/0647 ,  G06F3/0685

摘要： A storage subsystem combining solid state drive (SSD) and hard disk drive (HDD) technologies provides low access latency and low complexity. Separate free lists are maintained for the SSD and the HDD and blocks of file system data are stored uniquely on either the SSD or the HDD. When a read access is made to the subsystem, if the data is present on the SSD, the data is returned, but if the block is present on the HDD, it is migrated to the SSD and the block on the HDD is returned to the HDD free list. On a write access, if the block is present in the either the SSD or HDD, the block is overwritten, but if the block is not present in the subsystem, the block is written to the HDD.

公开(公告)号：US20130111135A1

公开(公告)日：2013-05-02

申请号：US13286507

申请日：2011-11-01

申请人： Robert H. Bell, JR. ,  Wen-Tzer T. Chen ,  Diane G. Flemming ,  Hong L. Hua ,  William A. Maron ,  Mysore S. Srinivas

发明人： Robert H. Bell, JR. ,  Wen-Tzer T. Chen ,  Diane G. Flemming ,  Hong L. Hua ,  William A. Maron ,  Mysore S. Srinivas

IPC分类号： G06F12/08

CPC分类号： G06F12/08 ,  G06F12/0811 ,  G06F12/0897

摘要： According to one aspect of the present disclosure, a system and technique for variable cache line size management is disclosed. The system includes a processor and a cache hierarchy, where the cache hierarchy includes a sectored upper level cache and an unsectored lower level cache, and wherein the upper level cache includes a plurality of sub-sectors, each sub-sector having a cache line size corresponding to a cache line size of the lower level cache. The system also includes logic executable to, responsive to determining that a cache line from the upper level cache is to be evicted to the lower level cache: identify referenced sub-sectors of the cache line to be evicted; invalidate unreferenced sub-sectors of the cache line to be evicted; and store the referenced sub-sectors in the lower level cache.

摘要翻译： 根据本公开的一个方面，公开了一种用于可变高速缓存行大小管理的系统和技术。 该系统包括处理器和高速缓存层级，其中高速缓存分层结构包括扇区高级缓存和未被覆盖的较低级高速缓存，并且其中高级高速缓存包括多个子扇区，每个子扇区具有高速缓存行大小 对应于较低级别缓存的高速缓存行大小。 该系统还包括可执行的逻辑，用于响应于确定来自较高级别高速缓存的高速缓存线将被驱逐到较低级高速缓存：识别要驱逐的高速缓存行的参考子扇区; 使缓存行的未引用子扇区无效; 并将参考的子扇区存储在较低级别的高速缓存中。

公开(公告)号：US20120096240A1

公开(公告)日：2012-04-19

申请号：US12905176

申请日：2010-10-15

申请人： Matthew Accapadi ,  Robert H. Bell, JR. ,  Hong L. Hua ,  Ram Raghavan ,  Mysore S. Srinivas

发明人： Matthew Accapadi ,  Robert H. Bell, JR. ,  Hong L. Hua ,  Ram Raghavan ,  Mysore S. Srinivas

IPC分类号： G06F9/38 ,  G06F9/455 ,  G06F9/30

CPC分类号： G06F9/505 ,  G06F12/0862 ,  G06F2209/503 ,  G06F2212/6026

摘要： A method, system and computer-usable medium are disclosed for managing prefetch streams in a virtual machine environment. Compiled application code in a first core, which comprises a Special Purpose Register (SPR) and a plurality of first prefetch engines, initiates a prefetch stream request. If the prefetch stream request cannot be initiated due to unavailability of a first prefetch engine, then an indicator bit indicating a Prefetch Stream Dispatch Fault is set in the SPR, causing a Hypervisor to interrupt the execution of the prefetch stream request. The Hypervisor then calls its associated operating system (OS), which determines prefetch engine availability for a second core comprising a plurality of second prefetch engines. If a second prefetch engine is available, then the OS migrates the prefetch stream request from the first core to the second core, where it is initiated on an available second prefetch engine.

公开(公告)号：US09298458B2

公开(公告)日：2016-03-29

申请号：US13427083

申请日：2012-03-22

申请人： Robert H. Bell, Jr. ,  Hong L. Hua ,  Ram Raghavan ,  Mysore S. Srinivas

发明人： Robert H. Bell, Jr. ,  Hong L. Hua ,  Ram Raghavan ,  Mysore S. Srinivas

IPC分类号： G06F9/30 ,  G06F9/38

CPC分类号： G06F9/30054 ,  G06F9/30185 ,  G06F9/3802

摘要： A method, system and computer-usable medium are disclosed for managing transient instruction streams. Transient flags are defined in Branch-and-Link (BRL) instructions that are known to be infrequently executed. A bit is likewise set in a Special Purpose Register (SPR) of the hardware (e.g., a core) that is executing an instruction request thread. Subsequent fetches or prefetches in the request thread are treated as transient and are not written to lower-level caches. If an instruction is non-transient, and if a lower-level cache is non-inclusive of the L1 instruction cache, a fetch or prefetch miss that is obtained from memory may be written in both the L1 and the lower-level cache. If it is not inclusive, a cast-out from the L1 instruction cache may be written in the lower-level cache.

公开(公告)号：US08943272B2

公开(公告)日：2015-01-27

申请号：US13451742

申请日：2012-04-20

申请人： Robert H. Bell, Jr. ,  Wen-Tzer T. Chen ,  Diane G. Flemming ,  Hong L. Hua ,  William A. Maron ,  Mysore S. Srinivas

发明人： Robert H. Bell, Jr. ,  Wen-Tzer T. Chen ,  Diane G. Flemming ,  Hong L. Hua ,  William A. Maron ,  Mysore S. Srinivas

IPC分类号： G06F12/00 ,  G06F12/08

CPC分类号： G06F12/08 ,  G06F12/0811 ,  G06F12/0897

摘要： According to one aspect of the present disclosure, a method and technique for variable cache line size management is disclosed. The method includes: determining whether an eviction of a cache line from an upper level sectored cache to an unsectored lower level cache is to be performed, wherein the upper level cache includes a plurality of sub-sectors, each sub-sector having a cache line size corresponding to a cache line size of the lower level cache; responsive to determining that an eviction is to be performed, identifying referenced sub-sectors of the cache line to be evicted; invalidating unreferenced sub-sectors of the cache line to be evicted; and storing the referenced sub-sectors in the lower level cache.

摘要翻译： 根据本公开的一个方面，公开了一种用于可变高速缓存行大小管理的方法和技术。 该方法包括：确定是否执行将高速缓存行从高级扇区高速缓存驱逐到未故障的较低级高速缓存，其中高级缓存包括多个子扇区，每个子扇区具有高速缓存行 对应于较低级缓存的高速缓存行大小的大小; 响应于确定要执行驱逐，识别要被驱逐的高速缓存行的参考子扇区; 使要删除的缓存行的未引用子扇区无效; 并将所引用的子扇区存储在下级缓存中。

公开(公告)号：US08769210B2

公开(公告)日：2014-07-01

申请号：US13323076

申请日：2011-12-12

申请人： Robert H. Bell, Jr. ,  Hong L. Hua ,  William A. Maron ,  Mysore S. Srinivas

发明人： Robert H. Bell, Jr. ,  Hong L. Hua ,  William A. Maron ,  Mysore S. Srinivas

IPC分类号： G06F12/08

CPC分类号： G06F12/0815

摘要： Some embodiments of the inventive subject matter are directed to a cache comprising a tracking unit and cache state machines. In some embodiments, the tracking unit is configured to track an amount of cache resources used to service cache misses within a past period. In some embodiments, each of the cache state machines is configured to, determine whether a memory access request results in a cache miss or cache hit, and in response to a cache miss for a memory access request, query the tracking unit for the amount of cache resources used to service cache misses within the past period. In some embodiments, the each of the cache state machines is configured to service the memory access request based, at least in part, on the amount of cache resources used to service the cache misses within the past period according to the tracking unit.

摘要翻译： 本发明主题的一些实施例涉及包括跟踪单元和高速缓存状态机的高速缓存。 在一些实施例中，跟踪单元被配置为跟踪用于在过去时间段内服务高速缓存未命中的高速缓存资源的量。 在一些实施例中，每个高速缓存状态机被配置为，确定存储器访问请求是否导致高速缓存未命中或高速缓存命中，并且响应于存储器访问请求的高速缓存未命中，查询跟踪单元的数量 用于在过去一段时间内缓存未命中服务的缓存资源。 在一些实施例中，每个高速缓存状态机被配置为至少部分地基于用于根据跟踪单元在过去时段内服务高速缓存未命中的高速缓存资源的量来服务存储器访问请求。

公开(公告)号：US20130151784A1

公开(公告)日：2013-06-13

申请号：US13586518

申请日：2012-08-15

申请人： Robert H. Bell, JR. ,  Hong L. Hua ,  William A. Maron ,  Mysore S. Srinivas

发明人： Robert H. Bell, JR. ,  Hong L. Hua ,  William A. Maron ,  Mysore S. Srinivas

IPC分类号： G06F12/12

CPC分类号： G06F12/0815

摘要： Some embodiments of the inventive subject matter are directed to determining that a memory access request results in a cache miss and determining an amount of cache resources used to service cache misses within a past period in response to determining that the memory access request results in the cache miss. Some embodiments are further directed to determining that servicing the memory access request would increase the amount of cache resources used to service cache misses within the past period to exceed a threshold. In some embodiments, the threshold corresponds to reservation of a given amount of cache resources for potential cache hits. Some embodiments are further directed to rejecting the memory access request in response to the determining that servicing the memory access request would increase the amount of cache resources used to service cache misses within the past period to exceed the threshold.

摘要翻译： 本发明的一些实施例涉及确定存储器访问请求导致高速缓存未命中，并且响应于确定存储器访问请求导致高速缓存而确定用于在过去时段内服务高速缓存未命中的高速缓存资源量 小姐。 一些实施例进一步涉及确定对存储器访问请求的服务将增加用于在过去时间段内服务高速缓存未命中的高速缓存资源的数量超过阈值。 在一些实施例中，阈值对应于用于潜在高速缓存命中的给定量的高速缓存资源的预留。 响应于确定对存储器访问请求的服务会增加在过去时间段内用于服务高速缓存未命中的高速缓存资源的数量超过阈值，一些实施例进一步涉及拒绝存储器访问请求。

公开(公告)号：US20120179873A1

公开(公告)日：2012-07-12

申请号：US13427083

申请日：2012-03-22

申请人： Robert H. Bell, JR. ,  Hong L. Hua ,  Ram Raghavan ,  Mysore S. Srinivas

发明人： Robert H. Bell, JR. ,  Hong L. Hua ,  Ram Raghavan ,  Mysore S. Srinivas

IPC分类号： G06F12/08

CPC分类号： G06F9/30054 ,  G06F9/30185 ,  G06F9/3802

摘要： A method, system and computer-usable medium are disclosed for managing transient instruction streams. Transient flags are defined in Branch-and-Link (BRL) instructions that are known to be infrequently executed. A bit is likewise set in a Special Purpose Register (SPR) of the hardware (e.g., a core) that is executing an instruction request thread. Subsequent fetches or prefetches in the request thread are treated as transient and are not written to lower-level caches. If an instruction is non-transient, and if a lower-level cache is non-inclusive of the L1 instruction cache, a fetch or prefetch miss that is obtained from memory may be written in both the L1 and the lower-level cache. If it is not inclusive, a cast-out from the L1 instruction cache may be written in the lower-level cache.

摘要翻译： 公开了用于管理瞬时指令流的方法，系统和计算机可用介质。 在已知很少执行的分支和链路（BRL）指令中定义了瞬态标志。 在执行指令请求线程的硬件（例如，核心）的专用寄存器（SPR）中同样设置一个位。 请求线程中的后续提取或预取将被视为暂时的，并且不会写入低级缓存。 如果指令是非瞬态的，并且如果低级缓存不包括L1指令高速缓存，则从存储器获得的获取或预取缺失可以写入L1和低级高速缓存中。 如果不包括在内，则可以将低速缓存中的L1指令高速缓存中的退出写入。

公开(公告)号：US08935478B2

公开(公告)日：2015-01-13

申请号：US13286507

申请日：2011-11-01

申请人： Robert H. Bell, Jr. ,  Wen-Tzer T. Chen ,  Diane G. Flemming ,  Hong L. Hua ,  William A. Maron ,  Mysore S. Srinivas

发明人： Robert H. Bell, Jr. ,  Wen-Tzer T. Chen ,  Diane G. Flemming ,  Hong L. Hua ,  William A. Maron ,  Mysore S. Srinivas

IPC分类号： G06F12/00 ,  G06F12/08

CPC分类号： G06F12/08 ,  G06F12/0811 ,  G06F12/0897

摘要： According to one aspect of the present disclosure, a system and technique for variable cache line size management is disclosed. The system includes a processor and a cache hierarchy, where the cache hierarchy includes a sectored upper level cache and an unsectored lower level cache, and wherein the upper level cache includes a plurality of sub-sectors, each sub-sector having a cache line size corresponding to a cache line size of the lower level cache. The system also includes logic executable to, responsive to determining that a cache line from the upper level cache is to be evicted to the lower level cache: identify referenced sub-sectors of the cache line to be evicted; invalidate unreferenced sub-sectors of the cache line to be evicted; and store the referenced sub-sectors in the lower level cache.

摘要翻译： 根据本公开的一个方面，公开了一种用于可变高速缓存行大小管理的系统和技术。 该系统包括处理器和高速缓存层级，其中高速缓存分层结构包括扇区高级缓存和未被覆盖的较低级高速缓存，并且其中高级高速缓存包括多个子扇区，每个子扇区具有高速缓存行大小 对应于较低级别缓存的高速缓存行大小。 该系统还包括可执行的逻辑，用于响应于确定来自较高级别高速缓存的高速缓存线将被驱逐到较低级高速缓存：识别要驱逐的高速缓存行的参考子扇区; 使缓存行的未引用子扇区无效; 并将参考的子扇区存储在较低级别的高速缓存中。