1/*
2 * Copyright (C) 2017 Yusuke Suzuki <utatane.tea@gmail.com>.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include <wtf/MemoryFootprint.h>
28
29#include <stdio.h>
30#include <wtf/MonotonicTime.h>
31#include <wtf/StdLibExtras.h>
32#include <wtf/text/StringView.h>
33
34namespace WTF {
35
36static const Seconds s_memoryFootprintUpdateInterval = 1_s;
37
38template<typename Functor>
39static void forEachLine(FILE* file, Functor functor)
40{
41 char* buffer = nullptr;
42 size_t size = 0;
43 while (getline(&buffer, &size, file) != -1) {
44 functor(buffer);
45 }
46 free(buffer);
47}
48
49static size_t computeMemoryFootprint()
50{
51 FILE* file = fopen("/proc/self/smaps", "r");
52 if (!file)
53 return 0;
54
55 unsigned long totalPrivateDirtyInKB = 0;
56 bool isAnonymous = false;
57 forEachLine(file, [&] (char* buffer) {
58 {
59 unsigned long start;
60 unsigned long end;
61 unsigned long offset;
62 unsigned long inode;
63 char dev[32];
64 char perms[5];
65 char path[7];
66 int scannedCount = sscanf(buffer, "%lx-%lx %4s %lx %31s %lu %6s", &start, &end, perms, &offset, dev, &inode, path);
67 if (scannedCount == 6) {
68 isAnonymous = true;
69 return;
70 }
71 if (scannedCount == 7) {
72 StringView pathString(path);
73 isAnonymous = pathString == "[heap]" || pathString.startsWith("[stack");
74 return;
75 }
76 }
77
78 if (!isAnonymous)
79 return;
80
81 unsigned long privateDirtyInKB;
82 if (sscanf(buffer, "Private_Dirty: %lu", &privateDirtyInKB) == 1)
83 totalPrivateDirtyInKB += privateDirtyInKB;
84 });
85 fclose(file);
86 return totalPrivateDirtyInKB * KB;
87}
88
89size_t memoryFootprint()
90{
91 static size_t footprint = 0;
92 static MonotonicTime previousUpdateTime = { };
93 Seconds elapsed = MonotonicTime::now() - previousUpdateTime;
94 if (elapsed >= s_memoryFootprintUpdateInterval) {
95 footprint = computeMemoryFootprint();
96 previousUpdateTime = MonotonicTime::now();
97 }
98
99 return footprint;
100}
101
102} // namespace WTF
103