1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
/*
* Copyright (c) 2004-2008 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2005 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* Copyright (c) 2009 Cisco Systems, Inc. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "opal_config.h"
#include <string.h>
#include <stddef.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "opal/constants.h"
#include "opal/mca/maffinity/maffinity.h"
#include "opal/mca/maffinity/base/base.h"
#include "maffinity_first_use.h"
/*
* Local functions
*/
static int first_use_module_init(void);
static int first_use_module_set(opal_maffinity_base_segment_t *segments,
size_t num_segments);
/*
* First_Use maffinity module
*/
static const opal_maffinity_base_module_1_0_0_t loc_module = {
/* Initialization function */
first_use_module_init,
/* Module function pointers */
first_use_module_set,
NULL,
NULL
};
int opal_maffinity_first_use_component_query(mca_base_module_t **module, int *priority)
{
int param;
param = mca_base_param_find("maffinity", "first_use", "priority");
mca_base_param_lookup_int(param, priority);
*module = (mca_base_module_t *)&loc_module;
return OPAL_SUCCESS;
}
static int first_use_module_init(void)
{
/* Nothing to do */
return OPAL_SUCCESS;
}
static int first_use_module_set(opal_maffinity_base_segment_t *segments,
size_t num_segments)
{
size_t i;
uintptr_t pagesize = (uintptr_t)sysconf(_SC_PAGESIZE);
volatile char useless;
for (i = 0; i < num_segments; ++i) {
char* ptr = (char*)segments[i].mbs_start_addr;
char* end_ptr = ptr + segments[i].mbs_len;
/* Let's touch the first byte of the segment. If this is the
* first byte on the memory page, good. If not, at least it
* will not overwrite anything important.
*/
useless = ptr[0];
/* Compute the address of the first byte on the next page */
ptr = (char*)((uintptr_t)(ptr + pagesize) & ~pagesize);
while( ptr <= end_ptr) {
useless += ptr[0];
ptr += pagesize;
};
}
return OPAL_SUCCESS;
}
|
