[PMU相关]请问uncore是什么意思

nswcfd

最近在调查一些关于Performance Counter相关的资料，遇到了一个词汇 uncore，
例如，blog.csdn.net/zgl07/article/details/43493343的标题就是 perf uncore PEBS

PEBS是precise event based sampling，简单的了解过其工作原理，
但是uncore头一次见到，不知道哪位大侠可以提供一点线索？

感觉uncore是core的反义词 ，莫非是指core外的一些event counter？

nswcfd

在网上找了一段文字
Basic operation of a PMU
• Number of counters in the CPU
• or other devices like GPU, NIC, Uncore

看起来应该是个device的概念？

nswcfd

搜到一个pdf
web.eece.maine.edu/~vweaver/projects/perf_events/uncore/offcore_uncore.pdf

Modern processors often have many processing cores in one package (or
socket). Traditional hardware performance counters measure only values
on a single core. A chip package has many resources which are packagewide
and thus need a separate performance reporting mechanism. The
values for these shared and off-core resources are reported as “offcore”,
“uncore” or “northbridge” events.