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authorYanan Wang <wangyanan55@huawei.com>2021-12-28 17:22:09 +0800
committerPhilippe Mathieu-Daudé <philmd@redhat.com>2021-12-31 13:42:39 +0100
commit864c3b5c32f02d3507e6a63bdb8a652803c4bd1b (patch)
treecd0c8d1f276818b590bcd7b5673aa803933547af /qapi
parent0d8717852326db6deb4f10ab47d3458fb2b73529 (diff)
hw/core/machine: Introduce CPU cluster topology support
The new Cluster-Aware Scheduling support has landed in Linux 5.16, which has been proved to benefit the scheduling performance (e.g. load balance and wake_affine strategy) on both x86_64 and AArch64. So now in Linux 5.16 we have four-level arch-neutral CPU topology definition like below and a new scheduler level for clusters. struct cpu_topology { int thread_id; int core_id; int cluster_id; int package_id; int llc_id; cpumask_t thread_sibling; cpumask_t core_sibling; cpumask_t cluster_sibling; cpumask_t llc_sibling; } A cluster generally means a group of CPU cores which share L2 cache or other mid-level resources, and it is the shared resources that is used to improve scheduler's behavior. From the point of view of the size range, it's between CPU die and CPU core. For example, on some ARM64 Kunpeng servers, we have 6 clusters in each NUMA node, and 4 CPU cores in each cluster. The 4 CPU cores share a separate L2 cache and a L3 cache tag, which brings cache affinity advantage. In virtualization, on the Hosts which have pClusters (physical clusters), if we can design a vCPU topology with cluster level for guest kernel and have a dedicated vCPU pinning. A Cluster-Aware Guest kernel can also make use of the cache affinity of CPU clusters to gain similar scheduling performance. This patch adds infrastructure for CPU cluster level topology configuration and parsing, so that the user can specify cluster parameter if their machines support it. Signed-off-by: Yanan Wang <wangyanan55@huawei.com> Message-Id: <20211228092221.21068-3-wangyanan55@huawei.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> [PMD: Added '(since 7.0)' to @clusters in qapi/machine.json] Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Diffstat (limited to 'qapi')
-rw-r--r--qapi/machine.json5
1 files changed, 4 insertions, 1 deletions
diff --git a/qapi/machine.json b/qapi/machine.json
index edeab6084b..372535b348 100644
--- a/qapi/machine.json
+++ b/qapi/machine.json
@@ -1404,7 +1404,9 @@
#
# @dies: number of dies per socket in the CPU topology
#
-# @cores: number of cores per die in the CPU topology
+# @clusters: number of clusters per die in the CPU topology (since 7.0)
+#
+# @cores: number of cores per cluster in the CPU topology
#
# @threads: number of threads per core in the CPU topology
#
@@ -1416,6 +1418,7 @@
'*cpus': 'int',
'*sockets': 'int',
'*dies': 'int',
+ '*clusters': 'int',
'*cores': 'int',
'*threads': 'int',
'*maxcpus': 'int' } }