PERF_MEM_LVL_IO  1104 include/uapi/linux/perf_event.h #define PERF_MEM_LVL_IO		0x1000 /* I/O memory */
PERF_MEM_LVL_IO  1104 tools/include/uapi/linux/perf_event.h #define PERF_MEM_LVL_IO		0x1000 /* I/O memory */