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fix(memory): provide better free memory approximation on old kernels

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The approximation should include SReclaimable, and subtract Shmem. To
prevent the parsing code from ballooning in size, this commit also
refactors the parsing into a map.
This commit is contained in:
Tudor Brindus 2020-03-20 17:37:22 -04:00
parent 37b1b35035
commit 19743f3085
2 changed files with 20 additions and 24 deletions
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3
include/modules/memory.hpp
View File

@ -17,8 +17,7 @@ class Memory : public ALabel {
static inline const std::string data_dir_ = "/proc/meminfo";
void parseMeminfo();
unsigned long memtotal_;
unsigned long memfree_;
std::unordered_map<std::string, unsigned long> meminfo_;
util::SleeperThread thread_;
};

41
src/modules/memory.cpp
View File

@ -10,11 +10,23 @@ waybar::modules::Memory::Memory(const std::string& id, const Json::Value& config
auto waybar::modules::Memory::update() -> void {
parseMeminfo();
if (memtotal_ > 0 && memfree_ >= 0) {
auto total_ram_gigabytes = memtotal_ / std::pow(1024, 2);
int used_ram_percentage = 100 * (memtotal_ - memfree_) / memtotal_;
auto used_ram_gigabytes = (memtotal_ - memfree_) / std::pow(1024, 2);
auto available_ram_gigabytes = memfree_ / std::pow(1024, 2);
unsigned long memtotal = meminfo_["MemTotal"];
unsigned long memfree;
if (meminfo_.count("MemAvailable")) {
// New kernels (3.4+) have an accurate available memory field.
memfree = meminfo_["MemAvailable"];
} else {
// Old kernel; give a best-effort approximation of available memory.
memfree = meminfo_["MemFree"] + meminfo_["Buffers"] + meminfo_["Cached"] +
meminfo_["SReclaimable"] - meminfo_["Shmem"];
}
if (memtotal > 0 && memfree >= 0) {
auto total_ram_gigabytes = memtotal / std::pow(1024, 2);
int used_ram_percentage = 100 * (memtotal - memfree) / memtotal;
auto used_ram_gigabytes = (memtotal - memfree) / std::pow(1024, 2);
auto available_ram_gigabytes = memfree / std::pow(1024, 2);
getState(used_ram_percentage);
label_.set_markup(fmt::format(format_,
@ -33,7 +45,6 @@ auto waybar::modules::Memory::update() -> void {
}
void waybar::modules::Memory::parseMeminfo() {
int64_t memfree = -1, membuffer = -1, memcache = -1, memavail = -1;
std::ifstream info(data_dir_);
if (!info.is_open()) {
throw std::runtime_error("Can't open " + data_dir_);
@ -44,23 +55,9 @@ void waybar::modules::Memory::parseMeminfo() {
if (posDelim == std::string::npos) {
continue;
}
std::string name = line.substr(0, posDelim);
int64_t value = std::stol(line.substr(posDelim + 1));
if (name.compare("MemTotal") == 0) {
memtotal_ = value;
} else if (name.compare("MemAvailable") == 0) {
memavail = value;
} else if (name.compare("MemFree") == 0) {
memfree = value;
} else if (name.compare("Buffers") == 0) {
membuffer = value;
} else if (name.compare("Cached") == 0) {
memcache = value;
}
if (memtotal_ > 0 && (memavail >= 0 || (memfree > -1 && membuffer > -1 && memcache > -1))) {
break;
}
meminfo_[name] = value;
}
memfree_ = memavail >= 0 ? memavail : memfree + membuffer + memcache;
}