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    • 6. 发明申请
    • METHOD AND DEVICE FOR PERFORMING COPY-ON-WRITE IN A PROCESSOR
    • 用于在处理器中执行复写的方法和设备
    • US20090248984A1
    • 2009-10-01
    • US12410325
    • 2009-03-24
    • Xiao Wei ShenHua Yong WangWen Bo ShenPeng Shao
    • Xiao Wei ShenHua Yong WangWen Bo ShenPeng Shao
    • G06F12/08G06F12/00
    • G06F12/0884G06F12/0811
    • There are disclosed a method and device for performing Copy-on-Write in a processor. The processor comprises: processor cores, L1 caches each of which is logically divided into a first L1 cache and a second L1 cache, and L2 caches. The first L1 cache is used for saving new data value, and the second L1 cache for saving old data value. The method can comprise the steps of: in response to a store operation from said processor core, judging whether a corresponding cache line in said L2 cache has been modified; if it is determined a corresponding L2 cache line in said L2 cache has not been modified, copying old data value in the corresponding L2 cache line to said second L1 cache, and writing new data value to the corresponding L2 cache line; and if it is determined a corresponding L2 cache line in said L2 cache has been modified, writing new data value to the corresponding L2 cache line directly.
    • 公开了一种用于在处理器中执行写时复制的方法和装置。 处理器包括:处理器核心,L1高速缓存,其中每个高速缓存被逻辑地划分为第一L1高速缓存和第二L1高速缓存以及L2高速缓存。 第一个L1缓存用于保存新数据值,第二个L1缓存用于保存旧数据值。 该方法可以包括以下步骤:响应于来自所述处理器核心的存储操作,判断所述L2高速缓存中的相应高速缓存行是否已被修改; 如果确定所述L2高速缓存中的对应的L2高速缓存行尚未被修改,则将相应的L2高速缓存行中的旧数据值复制到所述第二L1高速缓存,并将新的数据值写入对应的L2高速缓存行; 并且如果确定了所述L2高速缓存中的对应的L2高速缓存行已被修改,则将新的数据值直接写入对应的L2高速缓存行。