1 /*
2 * Copyright (C) 2014 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/sysinfo.h>
30
31 #include <dirent.h>
32 #include <stdio.h>
33 #include <string.h>
34 #include <unistd.h>
35
36 #include "platform/bionic/page.h"
37 #include "private/ScopedReaddir.h"
38 #include "private/get_cpu_count_from_string.h"
39
__get_cpu_count(const char * sys_file)40 int __get_cpu_count(const char* sys_file) {
41 int cpu_count = 1;
42 FILE* fp = fopen(sys_file, "re");
43 if (fp != nullptr) {
44 char* line = nullptr;
45 size_t allocated_size = 0;
46 if (getline(&line, &allocated_size, fp) != -1) {
47 cpu_count = GetCpuCountFromString(line);
48 }
49 free(line);
50 fclose(fp);
51 }
52 return cpu_count;
53 }
54
get_nprocs_conf()55 int get_nprocs_conf() {
56 // It's unclear to me whether this is intended to be "possible" or "present",
57 // but on mobile they're unlikely to differ.
58 return __get_cpu_count("/sys/devices/system/cpu/possible");
59 }
60
get_nprocs()61 int get_nprocs() {
62 return __get_cpu_count("/sys/devices/system/cpu/online");
63 }
64
get_phys_pages()65 long get_phys_pages() {
66 struct sysinfo si;
67 sysinfo(&si);
68 return (static_cast<int64_t>(si.totalram) * si.mem_unit) / page_size();
69 }
70
get_avphys_pages()71 long get_avphys_pages() {
72 struct sysinfo si;
73 sysinfo(&si);
74 return ((static_cast<int64_t>(si.freeram) + si.bufferram) * si.mem_unit) / page_size();
75 }
76