Hi Yanan, On 3/31/21 11:53 AM, Yanan Wang wrote: > Hi, > This series introduces the cluster cpu topology support, besides now > existing sockets, cores, and threads. > > A cluster means a group of cores that share some resources (e.g. cache) > among them under the LLC. For example, ARM64 server chip Kunpeng 920 has > 6 or 8 clusters in each NUMA, and each cluster has 4 cores. All clusters > share L3 cache data while cores within each cluster share the L2 cache. > > Also, there are some x86 CPU implementations (e.g. Jacobsville) where L2 > cache is shared among a cluster of cores instead of being exclusive to > one single core. For example, on Jacobsville there are 6 clusters of 4 > Atom cores, each cluster sharing a separate L2, and 24 cores sharing L3).
> About this series: > Note that, this series was implemented based on [3] and [4]. Although they > have not merged into qemu mainline for now, it's still meaning to post this > series to express the thoughts first. So a RFC is sent and any comments are > welcomed and appreciated. At a glance: tests/unit/test-x86-cpuid.c should be adapted to be generic (but still supporting target-specific sub-tests) and some aarch64 tests added. Similarly the ARM PPTT tables tested in tests/qtest/bios-tables-test.c. Otherwise, the overall series looks good and coherent, but it isn't my area :) Regards, Phil.
