FreeBSD src
d443a96ffb
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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| bin | ||
| cddl | ||
| contrib | ||
| crypto | ||
| etc | ||
| games | ||
| gnu | ||
| include | ||
| kerberos5 | ||
| lib | ||
| libexec | ||
| release | ||
| rescue | ||
| sbin | ||
| secure | ||
| share | ||
| sys | ||
| tools | ||
| usr.bin | ||
| usr.sbin | ||
| COPYRIGHT | ||
| LOCKS | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc1 | ||
| Makefile.mips | ||
| ObsoleteFiles.inc | ||
| README | ||
| UPDATING | ||
This is the top level of the FreeBSD source directory. This file was last revised on: $FreeBSD$ For copyright information, please see the file COPYRIGHT in this directory (additional copyright information also exists for some sources in this tree - please see the specific source directories for more information). The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree, the most commonly used one being ``world'', which rebuilds and installs everything in the FreeBSD system from the source tree except the kernel, the kernel-modules and the contents of /etc. The ``world'' target should only be used in cases where the source tree has not changed from the currently running version. See: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html for more information, including setting make(1) variables. The ``buildkernel'' and ``installkernel'' targets build and install the kernel and the modules (see below). Please see the top of the Makefile in this directory for more information on the standard build targets and compile-time flags. Building a kernel is a somewhat more involved process, documentation for which can be found at: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html And in the config(8) man page. Note: If you want to build and install the kernel with the ``buildkernel'' and ``installkernel'' targets, you might need to build world before. More information is available in the handbook. The sample kernel configuration files reside in the sys/<arch>/conf sub-directory (assuming that you've installed the kernel sources), the file named GENERIC being the one used to build your initial installation kernel. The file NOTES contains entries and documentation for all possible devices, not just those commonly used. It is the successor of the ancient LINT file, but in contrast to LINT, it is not buildable as a kernel but a pure reference and documentation file. Source Roadmap: --------------- bin System/user commands. contrib Packages contributed by 3rd parties. crypto Cryptography stuff (see crypto/README). etc Template files for /etc. games Amusements. gnu Various commands and libraries under the GNU Public License. Please see gnu/COPYING* for more information. include System include files. kerberos5 Kerberos5 (Heimdal) package. lib System libraries. libexec System daemons. release Release building Makefile & associated tools. rescue Build system for statically linked /rescue utilities. sbin System commands. secure Cryptographic libraries and commands. share Shared resources. sys Kernel sources. tools Utilities for regression testing and miscellaneous tasks. usr.bin User commands. usr.sbin System administration commands. For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/synching.html