2 * Copyright (c) 2022 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * This code uses concepts and configuration based on 'synth', by
8 * John R. Marino <draco@marino.st>, which was written in ada.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
20 * 3. Neither the name of The DragonFly Project nor the names of its
21 * contributors may be used to endorse or promote products derived
22 * from this software without specific, prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
25 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
26 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
27 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
28 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
29 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
30 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
31 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
32 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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34 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * Put builders into (numa) cpu domains to improve cache interactions
39 * (This is totally optional)
44 * Number of NUMA domains or integral multiple of same. Recommend a
45 * value of 0 (disabled), 2 or 4. Set with Numa_setsize parameter.
50 * Set the domain for the given slot number. -1 == reset to default.
53 setNumaDomain(int slot
)
55 static int numa_initialized
;
56 static cpu_set_t defset
;
59 * Auto-initialization (0) -> Enabled (1) or Disabled (-1)
61 if (numa_initialized
== 0) {
62 if (NumaSetSize
<= 1) {
66 numa_initialized
= -1;
67 } else if (pthread_getaffinity_np(pthread_self(),
68 sizeof(defset
), &defset
) != 0)
71 * Missing pthreads support
74 "Warning: pthread_*affinity*() "
76 numa_initialized
= -1;
79 * Operational, default set saved
86 * Do nothing if disabled
88 if (numa_initialized
< 0)
92 * Set domain for requested slot number or -1 to return to default
98 pthread_setaffinity_np(pthread_self(), sizeof(defset
), &defset
);
99 } else if (NumCores
<= NumaSetSize
* 2) {
101 * Not enough cores to partition
106 * Set cpumask to N-way partitioned mask of cpu threads,
107 * hopefully in the same NUMA domain.
109 * XXX hacked for the moment to assume a simple partitioning
110 * in linear blocks of cores, with the second half of the
111 * cpu space being the related sibling hyperthreads.
114 int hcores
= NumCores
/ 2;
115 int count
= (hcores
+ NumaSetSize
- 1) / NumaSetSize
;
118 slot
= slot
% NumaSetSize
;
122 for (i
= 0; i
< count
; ++i
) {
123 CPU_SET(slot
+ i
, &cpuset
);
124 CPU_SET(slot
+ hcores
+ i
, &cpuset
);
126 pthread_setaffinity_np(pthread_self(), sizeof(cpuset
), &cpuset
);