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
|
/*
* Copyright (C) 2014 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/sysinfo.h>
#include <dirent.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "platform/bionic/page.h"
#include "private/ScopedReaddir.h"
#include "private/get_cpu_count_from_string.h"
int __get_cpu_count(const char* sys_file) {
int cpu_count = 1;
FILE* fp = fopen(sys_file, "re");
if (fp != nullptr) {
char* line = nullptr;
size_t allocated_size = 0;
if (getline(&line, &allocated_size, fp) != -1) {
cpu_count = GetCpuCountFromString(line);
}
free(line);
fclose(fp);
}
return cpu_count;
}
int get_nprocs_conf() {
// It's unclear to me whether this is intended to be "possible" or "present",
// but on mobile they're unlikely to differ.
return __get_cpu_count("/sys/devices/system/cpu/possible");
}
int get_nprocs() {
return __get_cpu_count("/sys/devices/system/cpu/online");
}
long get_phys_pages() {
struct sysinfo si;
sysinfo(&si);
return (static_cast<int64_t>(si.totalram) * si.mem_unit) / page_size();
}
long get_avphys_pages() {
struct sysinfo si;
sysinfo(&si);
return ((static_cast<int64_t>(si.freeram) + si.bufferram) * si.mem_unit) / page_size();
}
|
