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/9.0/sys/sys/cpuset.h 223759 2011-07-04 12:18:12Z attilio $
   30  */
   31 
   32 #ifndef _SYS_CPUSET_H_
   33 #define _SYS_CPUSET_H_
   34 
   35 #include <sys/_cpuset.h>
   36 
   37 #define CPUSETBUFSIZ    ((2 + sizeof(long) * 2) * _NCPUWORDS)
   38 
   39 #define __cpuset_mask(n)        ((long)1 << ((n) % _NCPUBITS))
   40 #define CPU_CLR(n, p)   ((p)->__bits[(n)/_NCPUBITS] &= ~__cpuset_mask(n))
   41 #define CPU_COPY(f, t)  (void)(*(t) = *(f))
   42 #define CPU_ISSET(n, p) (((p)->__bits[(n)/_NCPUBITS] & __cpuset_mask(n)) != 0)
   43 #define CPU_SET(n, p)   ((p)->__bits[(n)/_NCPUBITS] |= __cpuset_mask(n))
   44 #define CPU_ZERO(p) do {                                \
   45         __size_t __i;                                   \
   46         for (__i = 0; __i < _NCPUWORDS; __i++)          \
   47                 (p)->__bits[__i] = 0;                   \
   48 } while (0)
   49 
   50 #define CPU_FILL(p) do {                                \
   51         __size_t __i;                                   \
   52         for (__i = 0; __i < _NCPUWORDS; __i++)          \
   53                 (p)->__bits[__i] = -1;                  \
   54 } while (0)
   55 
   56 #define CPU_SETOF(n, p) do {                                    \
   57         CPU_ZERO(p);                                            \
   58         ((p)->__bits[(n)/_NCPUBITS] = __cpuset_mask(n));        \
   59 } while (0)
   60 
   61 /* Is p empty. */
   62 #define CPU_EMPTY(p) __extension__ ({                   \
   63         __size_t __i;                                   \
   64         for (__i = 0; __i < _NCPUWORDS; __i++)          \
   65                 if ((p)->__bits[__i])                   \
   66                         break;                          \
   67         __i == _NCPUWORDS;                              \
   68 })
   69 
   70 /* Is p full set. */
   71 #define CPU_ISFULLSET(p) __extension__ ({               \
   72         __size_t __i;                                   \
   73         for (__i = 0; __i < _NCPUWORDS; __i++)          \
   74                 if ((p)->__bits[__i] != (long)-1)       \
   75                         break;                          \
   76         __i == _NCPUWORDS;                              \
   77 })
   78 
   79 /* Is c a subset of p. */
   80 #define CPU_SUBSET(p, c) __extension__ ({               \
   81         __size_t __i;                                   \
   82         for (__i = 0; __i < _NCPUWORDS; __i++)          \
   83                 if (((c)->__bits[__i] &                 \
   84                     (p)->__bits[__i]) !=                \
   85                     (c)->__bits[__i])                   \
   86                         break;                          \
   87         __i == _NCPUWORDS;                              \
   88 })
   89 
   90 /* Are there any common bits between b & c? */
   91 #define CPU_OVERLAP(p, c) __extension__ ({              \
   92         __size_t __i;                                   \
   93         for (__i = 0; __i < _NCPUWORDS; __i++)          \
   94                 if (((c)->__bits[__i] &                 \
   95                     (p)->__bits[__i]) != 0)             \
   96                         break;                          \
   97         __i != _NCPUWORDS;                              \
   98 })
   99 
  100 /* Compare two sets, returns 0 if equal 1 otherwise. */
  101 #define CPU_CMP(p, c) __extension__ ({                  \
  102         __size_t __i;                                   \
  103         for (__i = 0; __i < _NCPUWORDS; __i++)          \
  104                 if (((c)->__bits[__i] !=                \
  105                     (p)->__bits[__i]))                  \
  106                         break;                          \
  107         __i != _NCPUWORDS;                              \
  108 })
  109 
  110 #define CPU_OR(d, s) do {                               \
  111         __size_t __i;                                   \
  112         for (__i = 0; __i < _NCPUWORDS; __i++)          \
  113                 (d)->__bits[__i] |= (s)->__bits[__i];   \
  114 } while (0)
  115 
  116 #define CPU_AND(d, s) do {                              \
  117         __size_t __i;                                   \
  118         for (__i = 0; __i < _NCPUWORDS; __i++)          \
  119                 (d)->__bits[__i] &= (s)->__bits[__i];   \
  120 } while (0)
  121 
  122 #define CPU_NAND(d, s) do {                             \
  123         __size_t __i;                                   \
  124         for (__i = 0; __i < _NCPUWORDS; __i++)          \
  125                 (d)->__bits[__i] &= ~(s)->__bits[__i];  \
  126 } while (0)
  127 
  128 #define CPU_CLR_ATOMIC(n, p)                                            \
  129         atomic_clear_long(&(p)->__bits[(n)/_NCPUBITS], __cpuset_mask(n))
  130 
  131 #define CPU_SET_ATOMIC(n, p)                                            \
  132         atomic_set_long(&(p)->__bits[(n)/_NCPUBITS], __cpuset_mask(n))
  133 
  134 /* Convenience functions catering special cases. */ 
  135 #define CPU_OR_ATOMIC(d, s) do {                        \
  136         __size_t __i;                                   \
  137         for (__i = 0; __i < _NCPUWORDS; __i++)          \
  138                 atomic_set_long(&(d)->__bits[__i],      \
  139                     (s)->__bits[__i]);                  \
  140 } while (0)
  141 
  142 #define CPU_COPY_STORE_REL(f, t) do {                           \
  143         __size_t __i;                                           \
  144         for (__i = 0; __i < _NCPUWORDS; __i++)                  \
  145                 atomic_store_rel_long(&(t)->__bits[__i],        \
  146                     (f)->__bits[__i]);                          \
  147 } while (0)
  148 
  149 /*
  150  * Valid cpulevel_t values.
  151  */
  152 #define CPU_LEVEL_ROOT          1       /* All system cpus. */
  153 #define CPU_LEVEL_CPUSET        2       /* Available cpus for which. */
  154 #define CPU_LEVEL_WHICH         3       /* Actual mask/id for which. */
  155 
  156 /*
  157  * Valid cpuwhich_t values.
  158  */
  159 #define CPU_WHICH_TID           1       /* Specifies a thread id. */
  160 #define CPU_WHICH_PID           2       /* Specifies a process id. */
  161 #define CPU_WHICH_CPUSET        3       /* Specifies a set id. */
  162 #define CPU_WHICH_IRQ           4       /* Specifies an irq #. */
  163 #define CPU_WHICH_JAIL          5       /* Specifies a jail id. */
  164 
  165 /*
  166  * Reserved cpuset identifiers.
  167  */
  168 #define CPUSET_INVALID  -1
  169 #define CPUSET_DEFAULT  0
  170 
  171 #ifdef _KERNEL
  172 LIST_HEAD(setlist, cpuset);
  173 
  174 /*
  175  * cpusets encapsulate cpu binding information for one or more threads.
  176  *
  177  *      a - Accessed with atomics.
  178  *      s - Set at creation, never modified.  Only a ref required to read.
  179  *      c - Locked internally by a cpuset lock.
  180  *
  181  * The bitmask is only modified while holding the cpuset lock.  It may be
  182  * read while only a reference is held but the consumer must be prepared
  183  * to deal with inconsistent results.
  184  */
  185 struct cpuset {
  186         cpuset_t                cs_mask;        /* bitmask of valid cpus. */
  187         volatile u_int          cs_ref;         /* (a) Reference count. */
  188         int                     cs_flags;       /* (s) Flags from below. */
  189         cpusetid_t              cs_id;          /* (s) Id or INVALID. */
  190         struct cpuset           *cs_parent;     /* (s) Pointer to our parent. */
  191         LIST_ENTRY(cpuset)      cs_link;        /* (c) All identified sets. */
  192         LIST_ENTRY(cpuset)      cs_siblings;    /* (c) Sibling set link. */
  193         struct setlist          cs_children;    /* (c) List of children. */
  194 };
  195 
  196 #define CPU_SET_ROOT    0x0001  /* Set is a root set. */
  197 #define CPU_SET_RDONLY  0x0002  /* No modification allowed. */
  198 
  199 extern cpuset_t *cpuset_root;
  200 struct prison;
  201 struct proc;
  202 
  203 struct cpuset *cpuset_thread0(void);
  204 struct cpuset *cpuset_ref(struct cpuset *);
  205 void    cpuset_rel(struct cpuset *);
  206 int     cpuset_setthread(lwpid_t id, cpuset_t *);
  207 int     cpuset_create_root(struct prison *, struct cpuset **);
  208 int     cpuset_setproc_update_set(struct proc *, struct cpuset *);
  209 int     cpusetobj_ffs(const cpuset_t *);
  210 char    *cpusetobj_strprint(char *, const cpuset_t *);
  211 int     cpusetobj_strscan(cpuset_t *, const char *);
  212 
  213 #else
  214 __BEGIN_DECLS
  215 int     cpuset(cpusetid_t *);
  216 int     cpuset_setid(cpuwhich_t, id_t, cpusetid_t);
  217 int     cpuset_getid(cpulevel_t, cpuwhich_t, id_t, cpusetid_t *);
  218 int     cpuset_getaffinity(cpulevel_t, cpuwhich_t, id_t, size_t, cpuset_t *);
  219 int     cpuset_setaffinity(cpulevel_t, cpuwhich_t, id_t, size_t, const cpuset_t *);
  220 __END_DECLS
  221 #endif
  222 #endif /* !_SYS_CPUSET_H_ */

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

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sys/sys/cpuset.h