9c29d0d1f0
This patch is significantly based on previous work by jkim. List of changes: - added comments that describe topology uniformity assumption - added reference to Intel Processor Topology Enumeration article - documented a few global variables that describe topology - retired weirdly set and used logical_cpus variable - changed fallback code for mp_ncpus > 0 case, so that CPUs are treated as being different packages rather than cores in a single package - moved AMD-specific code to topo_probe_amd [jkim] - in topo_probe_0x4() follow Intel-prescribed procedure of deriving SMT and core masks and match APIC IDs against those masks [started by jkim] - in topo_probe_0x4() drop code for double-checking topology parameters by looking at L1 cache properties [jkim] - in topo_probe_0xb() add fallback path to topo_probe_0x4() as prescribed by Intel [jkim] Still to do: - prepare for upcoming AMD CPUs by using new mechanism of uniform topology description [pointed by jkim] - probe cache topology in addition to CPU topology and probably use that for scheduler affinity topology; e.g. Core2 Duo and Athlon II X2 have the same CPU topology, but Athlon cores do not share L2 cache while Core2's do (no L3 cache in both cases) - think of supporting non-uniform topologies if they are ever implemented for platforms in question - think how to better described old HTT vs new HTT distinction, HTT vs SMT can be confusing as SMT is a generic term - more robust code for marking CPUs as "logical" and/or "hyperthreaded", use HTT mask instead of modulo operation - correct support for halting logical and/or hyperthreaded CPUs, let scheduler know that it shouldn't schedule any threads on those CPUs PR: kern/145385 (related) In collaboration with: jkim Tested by: Sergey Kandaurov <pluknet@gmail.com>, Jeremy Chadwick <freebsd@jdc.parodius.com>, Chip Camden <sterling@camdensoftware.com>, Steve Wills <steve@mouf.net>, Olivier Smedts <olivier@gid0.org>, Florian Smeets <flo@smeets.im> MFC after: 1 month |
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| acpica | ||
| bios | ||
| compile | ||
| conf | ||
| i386 | ||
| ibcs2 | ||
| include | ||
| isa | ||
| linux | ||
| pci | ||
| svr4 | ||
| xbox | ||
| xen | ||
| Makefile | ||