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Implement DESKTOP_APP_REQUIRE_JEMALLOC switch #16717

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Implement DESKTOP_APP_REQUIRE_JEMALLOC switch #16717

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48 changes: 46 additions & 2 deletions Telegram/SourceFiles/platform/linux/specific_linux.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -56,6 +56,7 @@ For license and copyright information please follow this link:
#include <sys/sendfile.h>
#endif // Q_OS_LINUX
#include <cstdlib>
#include <dlfcn.h>
#include <unistd.h>
#include <dirent.h>
#include <pwd.h>
Expand Down Expand Up @@ -684,6 +685,47 @@ void HaikuAutostart(bool start) {
}
#endif // __HAIKU__

decltype(mallctl)* mallctlLoad() {
#ifdef DESKTOP_APP_REQUIRE_JEMALLOC
return &mallctl;
#elif defined(__GLIBC__)
// Despite using glibc, one can choose jemalloc via LD_PRELOAD.
// Detect the case and configure the allocator.

Dl_info info;
int rc = dladdr(reinterpret_cast<void*>(&malloc), &info);
if (!rc) {
LOG(("Can't retrieve malloc info: %1").arg(dlerror()));
return nullptr;
}
LOG(("We use allocator from %1").arg(info.dli_fname));
if (!QLatin1String(info.dli_fname)
.endsWith(QLatin1String("/libjemalloc.so.2"))) {
return nullptr;
}

void *handle = dlopen(info.dli_fname, RTLD_LAZY | RTLD_NOLOAD);
if (!handle) {
LOG(("Can't reopen jemalloc dynamic object: %1").arg(dlerror()));
return nullptr;
}

auto pointer = reinterpret_cast<decltype(mallctl)*>(
dlsym(handle, "mallctl"));
if (!pointer) {
LOG(("Can't find mallctl function: %1").arg(dlerror()));
}

rc = dlclose(handle);
if (rc) {
LOG(("Can't dlclose temporary handle: %1").arg(dlerror()));
}
return pointer;
#else // __GLIBC__
return nullptr;
#endif
}

} // namespace

QString psAppDataPath() {
Expand Down Expand Up @@ -727,8 +769,10 @@ int psFixPrevious() {
namespace Platform {

void start() {
auto backgroundThread = true;
mallctl("background_thread", nullptr, nullptr, &backgroundThread, sizeof(bool));
if (auto mallctlLoaded = mallctlLoad()) {
bool backgroundThread = true;
mallctlLoaded("background_thread", nullptr, nullptr, &backgroundThread, sizeof(bool));
}

LOG(("Launcher filename: %1").arg(QGuiApplication::desktopFileName()));

Expand Down