arch/x86/topology.rst

28 the past a socket always contained a single package (see below), but with the
29 advent of Multi Chip Modules (MCM) a socket can hold more than one package. So
39 Package  chapter
44 Modern systems may also use the term 'Die' for package.
46 AMD nomenclature for package is 'Node'.
48 Package-related topology information in the kernel:
52     The number of cores in a package. This information is retrieved via CPUID.
56     The number of dies in a package. This information is retrieved via CPUID.
64     The physical ID of the package. This information is retrieved via CPUID
65     and deduced from the APIC IDs of the cores in the package.
72     The logical ID of the package. As we do not trust BIOSes to enumerate the
73     packages in a consistent way, we introduced the concept of logical package
80     package facilities to preallocate per package information.
103     The number of threads in a core. The number of threads in a package can be
121     The cpumask contains all online threads in the package to which a thread
133     The logical package ID to which a thread belongs.
137     The physical package ID to which a thread belongs.
156 1) Single Package, Single Core::
158    [package 0] -> [core 0] -> [thread 0] -> Linux CPU 0
160 2) Single Package, Dual Core
164 	[package 0] -> [core 0] -> [thread 0] -> Linux CPU 0
169 	[package 0] -> [core 0] -> [thread 0] -> Linux CPU 0
176 	[package 0] -> [core 0] -> [thread 0] -> Linux CPU 0
188 4) Dual Package, Dual Core
192 	[package 0] -> [core 0] -> [thread 0] -> Linux CPU 0
195 	[package 1] -> [core 0] -> [thread 0] -> Linux CPU 2
200 	[package 0] -> [core 0] -> [thread 0] -> Linux CPU 0
205 	[package 1] -> [core 0] -> [thread 0] -> Linux CPU 4
212 	[package 0] -> [core 0] -> [thread 0] -> Linux CPU 0
217 	[package 1] -> [core 0] -> [thread 0] -> Linux CPU 2