PERF_CMD_SSIZE
if (cmd == PERF_CMD_SSIZE || cmd == PERF_CMD_SXLAT)
case PERF_CMD_SSIZE:
case PERF_CMD_SSIZE:
perf_cmd_exec(peer, PERF_CMD_SSIZE);
if (test_and_clear_bit(PERF_CMD_SSIZE, &peer->sts))
perf_cmd_send(peer, PERF_CMD_SSIZE, peer->outbuf_size);