The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/cpuset.h

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    1 /*-
    2  * Copyright (c) 2008,  Jeffrey Roberson <jeff@freebsd.org>
    3  * All rights reserved.
    4  *
    5  * Copyright (c) 2008 Nokia Corporation
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice unmodified, this list of conditions, and the following
   13  *    disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  *
   29  * $FreeBSD: releng/8.1/sys/sys/cpuset.h 199583 2009-11-20 15:27:52Z jhb $
   30  */
   31 
   32 #ifndef _SYS_CPUSET_H_
   33 #define _SYS_CPUSET_H_
   34 
   35 #ifdef _KERNEL
   36 #define CPU_SETSIZE     MAXCPU
   37 #endif
   38 
   39 #define CPU_MAXSIZE     128
   40 
   41 #ifndef CPU_SETSIZE
   42 #define CPU_SETSIZE     CPU_MAXSIZE
   43 #endif
   44 
   45 #define _NCPUBITS       (sizeof(long) * NBBY)   /* bits per mask */
   46 #define _NCPUWORDS      howmany(CPU_SETSIZE, _NCPUBITS)
   47 
   48 typedef struct _cpuset {
   49         long    __bits[howmany(CPU_SETSIZE, _NCPUBITS)];
   50 } cpuset_t;
   51 
   52 #define __cpuset_mask(n)        ((long)1 << ((n) % _NCPUBITS))
   53 #define CPU_CLR(n, p)   ((p)->__bits[(n)/_NCPUBITS] &= ~__cpuset_mask(n))
   54 #define CPU_COPY(f, t)  (void)(*(t) = *(f))
   55 #define CPU_ISSET(n, p) (((p)->__bits[(n)/_NCPUBITS] & __cpuset_mask(n)) != 0)
   56 #define CPU_SET(n, p)   ((p)->__bits[(n)/_NCPUBITS] |= __cpuset_mask(n))
   57 #define CPU_ZERO(p) do {                                \
   58         __size_t __i;                                   \
   59         for (__i = 0; __i < _NCPUWORDS; __i++)          \
   60                 (p)->__bits[__i] = 0;                   \
   61 } while (0)
   62 
   63 #define CPU_FILL(p) do {                                \
   64         __size_t __i;                                   \
   65         for (__i = 0; __i < _NCPUWORDS; __i++)          \
   66                 (p)->__bits[__i] = -1;                  \
   67 } while (0)
   68 
   69 /* Is p empty. */
   70 #define CPU_EMPTY(p) __extension__ ({                   \
   71         __size_t __i;                                   \
   72         for (__i = 0; __i < _NCPUWORDS; __i++)          \
   73                 if ((p)->__bits[__i])                   \
   74                         break;                          \
   75         __i == _NCPUWORDS;                              \
   76 })
   77 
   78 /* Is c a subset of p. */
   79 #define CPU_SUBSET(p, c) __extension__ ({               \
   80         __size_t __i;                                   \
   81         for (__i = 0; __i < _NCPUWORDS; __i++)          \
   82                 if (((c)->__bits[__i] &                 \
   83                     (p)->__bits[__i]) !=                \
   84                     (c)->__bits[__i])                   \
   85                         break;                          \
   86         __i == _NCPUWORDS;                              \
   87 })
   88 
   89 /* Are there any common bits between b & c? */
   90 #define CPU_OVERLAP(p, c) __extension__ ({              \
   91         __size_t __i;                                   \
   92         for (__i = 0; __i < _NCPUWORDS; __i++)          \
   93                 if (((c)->__bits[__i] &                 \
   94                     (p)->__bits[__i]) != 0)             \
   95                         break;                          \
   96         __i != _NCPUWORDS;                              \
   97 })
   98 
   99 /* Compare two sets, returns 0 if equal 1 otherwise. */
  100 #define CPU_CMP(p, c) __extension__ ({                  \
  101         __size_t __i;                                   \
  102         for (__i = 0; __i < _NCPUWORDS; __i++)          \
  103                 if (((c)->__bits[__i] !=                \
  104                     (p)->__bits[__i]))                  \
  105                         break;                          \
  106         __i != _NCPUWORDS;                              \
  107 })
  108 
  109 #define CPU_OR(d, s) do {                               \
  110         __size_t __i;                                   \
  111         for (__i = 0; __i < _NCPUWORDS; __i++)          \
  112                 (d)->__bits[__i] |= (s)->__bits[__i];   \
  113 } while (0)
  114 
  115 #define CPU_AND(d, s) do {                              \
  116         __size_t __i;                                   \
  117         for (__i = 0; __i < _NCPUWORDS; __i++)          \
  118                 (d)->__bits[__i] &= (s)->__bits[__i];   \
  119 } while (0)
  120 
  121 #define CPU_NAND(d, s) do {                             \
  122         __size_t __i;                                   \
  123         for (__i = 0; __i < _NCPUWORDS; __i++)          \
  124                 (d)->__bits[__i] &= ~(s)->__bits[__i];  \
  125 } while (0)
  126 
  127 /*
  128  * Valid cpulevel_t values.
  129  */
  130 #define CPU_LEVEL_ROOT          1       /* All system cpus. */
  131 #define CPU_LEVEL_CPUSET        2       /* Available cpus for which. */
  132 #define CPU_LEVEL_WHICH         3       /* Actual mask/id for which. */
  133 
  134 /*
  135  * Valid cpuwhich_t values.
  136  */
  137 #define CPU_WHICH_TID           1       /* Specifies a thread id. */
  138 #define CPU_WHICH_PID           2       /* Specifies a process id. */
  139 #define CPU_WHICH_CPUSET        3       /* Specifies a set id. */
  140 #define CPU_WHICH_IRQ           4       /* Specifies an irq #. */
  141 #define CPU_WHICH_JAIL          5       /* Specifies a jail id. */
  142 
  143 /*
  144  * Reserved cpuset identifiers.
  145  */
  146 #define CPUSET_INVALID  -1
  147 #define CPUSET_DEFAULT  0
  148 
  149 #ifdef _KERNEL
  150 LIST_HEAD(setlist, cpuset);
  151 
  152 /*
  153  * cpusets encapsulate cpu binding information for one or more threads.
  154  *
  155  *      a - Accessed with atomics.
  156  *      s - Set at creation, never modified.  Only a ref required to read.
  157  *      c - Locked internally by a cpuset lock.
  158  *
  159  * The bitmask is only modified while holding the cpuset lock.  It may be
  160  * read while only a reference is held but the consumer must be prepared
  161  * to deal with inconsistent results.
  162  */
  163 struct cpuset {
  164         cpuset_t                cs_mask;        /* bitmask of valid cpus. */
  165         volatile u_int          cs_ref;         /* (a) Reference count. */
  166         int                     cs_flags;       /* (s) Flags from below. */
  167         cpusetid_t              cs_id;          /* (s) Id or INVALID. */
  168         struct cpuset           *cs_parent;     /* (s) Pointer to our parent. */
  169         LIST_ENTRY(cpuset)      cs_link;        /* (c) All identified sets. */
  170         LIST_ENTRY(cpuset)      cs_siblings;    /* (c) Sibling set link. */
  171         struct setlist          cs_children;    /* (c) List of children. */
  172 };
  173 
  174 #define CPU_SET_ROOT    0x0001  /* Set is a root set. */
  175 #define CPU_SET_RDONLY  0x0002  /* No modification allowed. */
  176 
  177 extern cpuset_t *cpuset_root;
  178 struct prison;
  179 struct proc;
  180 
  181 struct cpuset *cpuset_thread0(void);
  182 struct cpuset *cpuset_ref(struct cpuset *);
  183 void    cpuset_rel(struct cpuset *);
  184 int     cpuset_setthread(lwpid_t id, cpuset_t *);
  185 int     cpuset_create_root(struct prison *, struct cpuset **);
  186 int     cpuset_setproc_update_set(struct proc *, struct cpuset *);
  187 
  188 #else
  189 __BEGIN_DECLS
  190 int     cpuset(cpusetid_t *);
  191 int     cpuset_setid(cpuwhich_t, id_t, cpusetid_t);
  192 int     cpuset_getid(cpulevel_t, cpuwhich_t, id_t, cpusetid_t *);
  193 int     cpuset_getaffinity(cpulevel_t, cpuwhich_t, id_t, size_t, cpuset_t *);
  194 int     cpuset_setaffinity(cpulevel_t, cpuwhich_t, id_t, size_t, const cpuset_t *);
  195 __END_DECLS
  196 #endif
  197 #endif /* !_SYS_CPUSET_H_ */

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