diff --git a/init/uevent_listener.cpp b/init/uevent_listener.cpp index 24b14c44dc4c82a7db3dbee65cfaad09461e8d6d..81486e1089f8185dd2dfbd187bf25b46a29dbd2d 100644 --- a/init/uevent_listener.cpp +++ b/init/uevent_listener.cpp @@ -23,7 +23,11 @@ #include <memory> +#include <android-base/chrono_utils.h> +#include <android-base/file.h> #include <android-base/logging.h> +#include <android-base/scopeguard.h> +#include <android-base/stringprintf.h> #include <cutils/uevent.h> namespace android { @@ -130,9 +134,19 @@ ListenerAction UeventListener::RegenerateUeventsForDir(DIR* d, int fd = openat(dfd, "uevent", O_WRONLY); if (fd >= 0) { + android::base::Timer t; write(fd, "add\n", 4); + const std::string fd_path = android::base::StringPrintf("/proc/self/fd/%d", fd); + std::string uevent_file_path; + android::base::Readlink(fd_path, &uevent_file_path); close(fd); + auto guard = android::base::make_scope_guard([&t, &uevent_file_path]() { + if (t.duration() > 50ms) { + LOG(WARNING) << "ReadUevent took " << t << " on '" << uevent_file_path << "'"; + } + }); + Uevent uevent; while (ReadUevent(&uevent)) { if (callback(uevent) == ListenerAction::kStop) return ListenerAction::kStop;