source: trunk/sys/libphoenix/scheduler.c @ 1

Last change on this file since 1 was 1, checked in by alain, 5 years ago

First import

File size: 2.9 KB
Line 
1/* Copyright (c) 2007-2009, Stanford University
2* All rights reserved.
3*
4* Redistribution and use in source and binary forms, with or without
5* modification, are permitted provided that the following conditions are met:
6*     * Redistributions of source code must retain the above copyright
7*       notice, this list of conditions and the following disclaimer.
8*     * Redistributions in binary form must reproduce the above copyright
9*       notice, this list of conditions and the following disclaimer in the
10*       documentation and/or other materials provided with the distribution.
11*     * Neither the name of Stanford University nor the names of its
12*       contributors may be used to endorse or promote products derived from
13*       this software without specific prior written permission.
14*
15* THIS SOFTWARE IS PROVIDED BY STANFORD UNIVERSITY ``AS IS'' AND ANY
16* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18* DISCLAIMED. IN NO EVENT SHALL STANFORD UNIVERSITY BE LIABLE FOR ANY
19* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
20* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
21* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
22* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
24* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25*/ 
26
27#include <assert.h>
28
29#include "scheduler.h"
30#include "locality.h"
31#include "processor.h"
32
33static int map_fill_strand(sched_policy* sp, int thr);
34static int map_fill_core(sched_policy* sp, int thr);
35static int map_fill_chip(sched_policy* sp, int thr);
36
37struct sched_policy
38{
39    int     num_cpus;
40    int     num_chips_per_sys;
41    int     (*map)(sched_policy* sp, int thr_idx);
42};
43
44struct sched_policy policies[SCHED_POLICY_LAST + 1] = {
45    { .map = map_fill_strand },
46    { .map = map_fill_core },
47    { .map = map_fill_chip },
48};
49
50sched_policy* sched_policy_get(unsigned int policy)
51{
52    assert (policy <= SCHED_POLICY_LAST);
53    /* XXX make this configurable */
54    policies[policy].num_cpus = proc_get_num_cpus();
55    policies[policy].num_chips_per_sys = loc_get_num_lgrps ();
56    return &policies[policy];
57}
58
59void sched_policy_put(sched_policy* sp)
60{
61    /* STUB */
62}
63
64/**
65 * Given a thread index, gives the cpu it should be assigned to.
66 */
67int sched_thr_to_cpu(sched_policy* sp, int thr)
68{
69    return sp->map(sp, thr);
70}
71
72static int map_fill_strand(sched_policy* sp, int thr)
73{
74    int num_cpus = sp->num_cpus;
75    return (thr % num_cpus);
76}
77
78static int map_fill_core(sched_policy* sp, int thr)
79{
80    int num_cpus = sp->num_cpus;
81
82    return thr % num_cpus;
83}
84
85static int map_fill_chip(sched_policy* sp, int thr)
86{
87    int num_cpus = sp->num_cpus;
88
89    return thr % num_cpus;
90}
Note: See TracBrowser for help on using the repository browser.