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/10.2/sys/sys/cpuset.h 281538 2015-04-14 20:05:26Z jhb $
   30  */
   31 
   32 #ifndef _SYS_CPUSET_H_
   33 #define _SYS_CPUSET_H_
   34 
   35 #include <sys/_cpuset.h>
   36 
   37 #include <sys/bitset.h>
   38 
   39 #define CPUSETBUFSIZ    ((2 + sizeof(long) * 2) * _NCPUWORDS)
   40 
   41 #define CPU_CLR(n, p)                   BIT_CLR(CPU_SETSIZE, n, p)
   42 #define CPU_COPY(f, t)                  BIT_COPY(CPU_SETSIZE, f, t)
   43 #define CPU_ISSET(n, p)                 BIT_ISSET(CPU_SETSIZE, n, p)
   44 #define CPU_SET(n, p)                   BIT_SET(CPU_SETSIZE, n, p)
   45 #define CPU_ZERO(p)                     BIT_ZERO(CPU_SETSIZE, p)
   46 #define CPU_FILL(p)                     BIT_FILL(CPU_SETSIZE, p)
   47 #define CPU_SETOF(n, p)                 BIT_SETOF(CPU_SETSIZE, n, p)
   48 #define CPU_EMPTY(p)                    BIT_EMPTY(CPU_SETSIZE, p)
   49 #define CPU_ISFULLSET(p)                BIT_ISFULLSET(CPU_SETSIZE, p)
   50 #define CPU_SUBSET(p, c)                BIT_SUBSET(CPU_SETSIZE, p, c)
   51 #define CPU_OVERLAP(p, c)               BIT_OVERLAP(CPU_SETSIZE, p, c)
   52 #define CPU_CMP(p, c)                   BIT_CMP(CPU_SETSIZE, p, c)
   53 #define CPU_OR(d, s)                    BIT_OR(CPU_SETSIZE, d, s)
   54 #define CPU_AND(d, s)                   BIT_AND(CPU_SETSIZE, d, s)
   55 #define CPU_NAND(d, s)                  BIT_NAND(CPU_SETSIZE, d, s)
   56 #define CPU_CLR_ATOMIC(n, p)            BIT_CLR_ATOMIC(CPU_SETSIZE, n, p)
   57 #define CPU_SET_ATOMIC(n, p)            BIT_SET_ATOMIC(CPU_SETSIZE, n, p)
   58 #define CPU_SET_ATOMIC_ACQ(n, p)        BIT_SET_ATOMIC_ACQ(CPU_SETSIZE, n, p)
   59 #define CPU_AND_ATOMIC(n, p)            BIT_AND_ATOMIC(CPU_SETSIZE, n, p)
   60 #define CPU_OR_ATOMIC(d, s)             BIT_OR_ATOMIC(CPU_SETSIZE, d, s)
   61 #define CPU_COPY_STORE_REL(f, t)        BIT_COPY_STORE_REL(CPU_SETSIZE, f, t)
   62 #define CPU_FFS(p)                      BIT_FFS(CPU_SETSIZE, p)
   63 #define CPU_COUNT(p)                    BIT_COUNT(CPU_SETSIZE, p)
   64 
   65 /*
   66  * Valid cpulevel_t values.
   67  */
   68 #define CPU_LEVEL_ROOT          1       /* All system cpus. */
   69 #define CPU_LEVEL_CPUSET        2       /* Available cpus for which. */
   70 #define CPU_LEVEL_WHICH         3       /* Actual mask/id for which. */
   71 
   72 /*
   73  * Valid cpuwhich_t values.
   74  */
   75 #define CPU_WHICH_TID           1       /* Specifies a thread id. */
   76 #define CPU_WHICH_PID           2       /* Specifies a process id. */
   77 #define CPU_WHICH_CPUSET        3       /* Specifies a set id. */
   78 #define CPU_WHICH_IRQ           4       /* Specifies an irq #. */
   79 #define CPU_WHICH_JAIL          5       /* Specifies a jail id. */
   80 
   81 /*
   82  * Reserved cpuset identifiers.
   83  */
   84 #define CPUSET_INVALID  -1
   85 #define CPUSET_DEFAULT  0
   86 
   87 #ifdef _KERNEL
   88 LIST_HEAD(setlist, cpuset);
   89 
   90 /*
   91  * cpusets encapsulate cpu binding information for one or more threads.
   92  *
   93  *      a - Accessed with atomics.
   94  *      s - Set at creation, never modified.  Only a ref required to read.
   95  *      c - Locked internally by a cpuset lock.
   96  *
   97  * The bitmask is only modified while holding the cpuset lock.  It may be
   98  * read while only a reference is held but the consumer must be prepared
   99  * to deal with inconsistent results.
  100  */
  101 struct cpuset {
  102         cpuset_t                cs_mask;        /* bitmask of valid cpus. */
  103         volatile u_int          cs_ref;         /* (a) Reference count. */
  104         int                     cs_flags;       /* (s) Flags from below. */
  105         cpusetid_t              cs_id;          /* (s) Id or INVALID. */
  106         struct cpuset           *cs_parent;     /* (s) Pointer to our parent. */
  107         LIST_ENTRY(cpuset)      cs_link;        /* (c) All identified sets. */
  108         LIST_ENTRY(cpuset)      cs_siblings;    /* (c) Sibling set link. */
  109         struct setlist          cs_children;    /* (c) List of children. */
  110 };
  111 
  112 #define CPU_SET_ROOT    0x0001  /* Set is a root set. */
  113 #define CPU_SET_RDONLY  0x0002  /* No modification allowed. */
  114 
  115 extern cpuset_t *cpuset_root;
  116 struct prison;
  117 struct proc;
  118 
  119 struct cpuset *cpuset_thread0(void);
  120 struct cpuset *cpuset_ref(struct cpuset *);
  121 void    cpuset_rel(struct cpuset *);
  122 int     cpuset_setthread(lwpid_t id, cpuset_t *);
  123 int     cpuset_create_root(struct prison *, struct cpuset **);
  124 int     cpuset_setproc_update_set(struct proc *, struct cpuset *);
  125 char    *cpusetobj_strprint(char *, const cpuset_t *);
  126 int     cpusetobj_strscan(cpuset_t *, const char *);
  127 #ifdef DDB
  128 void    ddb_display_cpuset(const cpuset_t *);
  129 #endif
  130 
  131 #else
  132 __BEGIN_DECLS
  133 int     cpuset(cpusetid_t *);
  134 int     cpuset_setid(cpuwhich_t, id_t, cpusetid_t);
  135 int     cpuset_getid(cpulevel_t, cpuwhich_t, id_t, cpusetid_t *);
  136 int     cpuset_getaffinity(cpulevel_t, cpuwhich_t, id_t, size_t, cpuset_t *);
  137 int     cpuset_setaffinity(cpulevel_t, cpuwhich_t, id_t, size_t, const cpuset_t *);
  138 __END_DECLS
  139 #endif
  140 #endif /* !_SYS_CPUSET_H_ */

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