Merge "logd: simpleperf inspired optimizations"

    char buffer[sizeof_log_id_t + sizeof(uint16_t) + sizeof(log_time)

        + LOGGER_ENTRY_MAX_PAYLOAD];

    struct iovec iov = { buffer, sizeof(buffer) };

    memset(buffer, 0, sizeof(buffer));

    char control[CMSG_SPACE(sizeof(struct ucred))];

    struct msghdr hdr = {

    int socket = cli->getSocket();

    // To clear the entire buffer is secure/safe, but this contributes to 1.68%

    // overhead under logging load. We are safe because we check counts.

    // memset(buffer, 0, sizeof(buffer));

    ssize_t n = recvmsg(socket, &hdr, 0);

    if (n <= (ssize_t)(sizeof(android_log_header_t))) {

        return false;