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src: adjust THP sysfs config token retrieval and file closure #37187

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Feb 17, 2021
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src: adjust THP sysfs config token retrieval and file closure #37187

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20 changes: 9 additions & 11 deletions src/large_pages/node_large_page.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -258,23 +258,21 @@ struct text_region FindNodeTextRegion() {

#if defined(__linux__)
bool IsTransparentHugePagesEnabled() {
std::ifstream ifs;

// File format reference:
// https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/mm/huge_memory.c?id=13391c60da3308ed9980de0168f74cce6c62ac1d#n163
ifs.open("/sys/kernel/mm/transparent_hugepage/enabled");
if (!ifs) {
const char* filename = "/sys/kernel/mm/transparent_hugepage/enabled";
std::ifstream config_stream(filename, std::ios::in);
if (!config_stream.good()) {
PrintWarning("could not open /sys/kernel/mm/transparent_hugepage/enabled");
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return false;
}

std::string always, madvise;
if (ifs.is_open()) {
ifs >> always >> madvise;
}
ifs.close();

return always == "[always]" || madvise == "[madvise]";
std::string token;
config_stream >> token;
if ("[always]" == token) return true;
config_stream >> token;
if ("[madvise]" == token) return true;
return false;
}
#elif defined(__FreeBSD__)
bool IsSuperPagesEnabled() {
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