xaizek / d2if (License: GPLv2+) (since 2018-12-07)
Simple dzen2 input formatter, which is supposed to not waste CPU time for nothing and provides a number of builtin "widgets" for displaying system information.
Clone URLs: https://code.reversed.top/user/xaizek/d2if ssh://rocketgit@code.reversed.top/user/xaizek/d2if
master
Commit 1ba6c2257f938aa1e82cd2492ca0a4516e45984c

Take SReclaimable memory into account
Before this change estimated used memory was greater than it actually
was.
Author: xaizek
Author date (UTC): 2024-04-10 11:30
Committer name: xaizek
Committer date (UTC): 2024-04-10 11:30
Parent(s): 032ba36f519699964568bc92be0d11652866706c
Signing key: 99DC5E4DB05F6BE2
Tree: 467b070dd593a20b8b0645bc8fcaeef86e9034cb
File Lines added Lines deleted
src/Memory.cpp 35 9
File src/Memory.cpp changed (mode: 100644) (index 8d01270..6182932)
... ... void Memory::update()
55 55 Field::setText(result.str()); Field::setText(result.str());
56 56 } }
57 57
58 template <std::size_t N>
59 bool startsWith(const std::string &str, const char (&prefix)[N])
60 {
61 return str.compare(0, N - 1, prefix) == 0;
62 }
63
64 template <std::size_t N>
65 bool extractUint64(const std::string &str, const char (&prefix)[N],
66 std::uint64_t &value)
67 {
68 if (!startsWith(str, prefix)) {
69 return false;
70 }
71
72 value = std::strtoull(str.c_str() + N, nullptr, 10);
73 return true;
74 }
75
58 76 int Memory::getMemoryUsage() const int Memory::getMemoryUsage() const
59 77 { {
78 // Mimicking behaviour of `free` tool from `procps`, see `man free`.
79
60 80 std::ifstream meminfo("/proc/meminfo"); std::ifstream meminfo("/proc/meminfo");
61 81 if (!meminfo.is_open()) { if (!meminfo.is_open()) {
62 82 return (-1); return (-1);
63 83 } }
64 84
65 std::uint64_t total, free, avail, buffers, cached;
66
67 meminfo.ignore(std::numeric_limits<std::streamsize>::max(), ':') >> total;
68 meminfo.ignore(std::numeric_limits<std::streamsize>::max(), ':') >> free;
69 meminfo.ignore(std::numeric_limits<std::streamsize>::max(), ':') >> avail;
70 meminfo.ignore(std::numeric_limits<std::streamsize>::max(), ':') >> buffers;
71 meminfo.ignore(std::numeric_limits<std::streamsize>::max(), ':') >> cached;
72
73 meminfo.close();
85 std::uint64_t total = 0, free = 0, buffers = 0, cached = 0;
86 for (std::string buf(64, '\0'); meminfo.getline(&buf[0], buf.size()); ) {
87 std::uint64_t value;
88 if (extractUint64(buf, "MemTotal:", value)) {
89 total = value;
90 } else if (extractUint64(buf, "MemFree:", value)) {
91 free = value;
92 } else if (extractUint64(buf, "Buffers:", value)) {
93 buffers = value;
94 } else if (extractUint64(buf, "Cached:", value)) {
95 cached += value;
96 } else if (extractUint64(buf, "SReclaimable:", value)) {
97 cached += value;
98 }
99 }
74 100
75 101 const std::uint64_t usage { const std::uint64_t usage {
76 102 100 - ((free + buffers + cached)*100)/total 100 - ((free + buffers + cached)*100)/total
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