1 .\" Copyright (c) 2008 Christian Brueffer
2 .\" Copyright (c) 2008 Jeffrey Roberson
3 .\" All rights reserved.
5 .\" Redistribution and use in source and binary forms, with or without
6 .\" modification, are permitted provided that the following conditions
8 .\" 1. Redistributions of source code must retain the above copyright
9 .\" notice, this list of conditions and the following disclaimer.
10 .\" 2. Redistributions in binary form must reproduce the above copyright
11 .\" notice, this list of conditions and the following disclaimer in the
12 .\" documentation and/or other materials provided with the distribution.
14 .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 .Nm cpuset_getaffinity ,
33 .Nm cpuset_setaffinity
34 .Nd manage CPU affinity
41 .Fn cpuset_getaffinity "cpulevel_t level" "cpuwhich_t which" "id_t id" "size_t setsize" "cpuset_t *mask"
43 .Fn cpuset_setaffinity "cpulevel_t level" "cpuwhich_t which" "id_t id" "size_t setsize" "const cpuset_t *mask"
45 .Fn cpuset_getaffinity
47 .Fn cpuset_setaffinity
48 allow the manipulation of sets of CPUs available to processes, threads,
49 interrupts, jails and other resources.
50 These functions may manipulate sets of CPUs that contain many processes
51 or per-object anonymous masks that effect only a single object.
53 The valid values for the
57 arguments are documented in
59 These arguments specify which object and which set of the object we are
61 Not all possible combinations are valid.
62 For example, only processes may belong to a numbered set accessed by a
65 .Dv CPU_LEVEL_CPUSET .
66 All resources, however, have a mask which may be manipulated with
71 are composed using the
74 The kernel tolerates large sets as long as all CPUs specified
76 Sets smaller than the kernel uses generate an error on calls to
77 .Fn cpuset_getaffinity
78 even if the result set would fit within the user supplied set.
80 .Fn cpuset_setaffinity
81 tolerate small sets with no restrictions.
83 The supplied mask should have a size of
86 This size is usually provided by calling
88 which is ultimately determined by the value of
93 .Fn cpuset_getaffinity
95 mask from the object specified by
100 and stores it in the space provided by
103 .Fn cpuset_setaffinity
104 attempts to set the mask for the object specified by
115 The following error codes may be set in
123 argument was not a valid value.
126 .Fn cpuset_setaffinity
127 call would leave a thread without a valid CPU to run on because the set
128 does not overlap with the thread's anonymous mask.
130 The mask pointer passed was invalid.
132 The object specified by the
136 arguments could not be found.
140 was either preposterously large or smaller than the kernel set size.
142 The calling process did not have the credentials required to complete the
154 family of system calls first appeared in
157 .An Jeffrey Roberson Aq jeff@FreeBSD.org