Re: HyperThreading and CPU topologies.

From: Poul-Henning Kamp (phk_at_phk.freebsd.dk)
Date: 06/12/03

  • Next message: Marcel Moolenaar: "Re: HyperThreading and CPU topologies." 
    To: Jeff Roberson <jroberson@chesapeake.net>
Date: Thu, 12 Jun 2003 13:45:52 +0200

    In message <20030612051553.J36168-100000@mail.chesapeake.net>, Jeff Roberson wr
    ites:
    >Index: smp.h
    >===================================================================
    >RCS file: /home/ncvs/src/sys/sys/smp.h,v
    >retrieving revision 1.72
    >diff -r1.72 smp.h
    >19a20,46
    >>
    >> /*
    >> * Topology of a NUMA or HTT system.
    >> *
    >> * The top level topology is an array of pointers to groups. Each group
    >> * contains a bitmask of cpus in its group or subgroups. It may also
    >> * contain a pointer to an array of child groups.
    >> *
    >> * The bitmasks at non leaf groups may be used by consumers who support
    >> * a smaller depth than the hardware provides.
    >> *
    >> * The topology may be omitted by systems where all CPUs are equal.
    >> */
    >>
    >> struct cpu_group {
    >> int cg_mask; /* Mask of cpus in this group. */

    u_int ?

    uint32_t ?

    >> int cg_count; /* Count of cpus in this group. */
    >> int cg_children; /* Number of children groups. */
    >> struct cpu_group **cg_child; /* Optional child group. */
    >> };
    >>
    >> struct cpu_top {
    >> int ct_count; /* Count of groups. */
    >> struct cpu_group **ct_group; /* Array of pointers to cpu
    >groups. */
    >> };
    >>
    >> extern struct cpu_top *smp_topology; 

    -- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.
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  • Next message: Marcel Moolenaar: "Re: HyperThreading and CPU topologies."

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