| ==================================================================== |
| Marvell Odyssey LLC-TAD Performance Monitoring Unit (PMU UNCORE) |
| ==================================================================== |
| |
| Each TAD provides eight 64-bit counters for monitoring |
| cache behavior.The driver always configures the same counter for |
| all the TADs. The user would end up effectively reserving one of |
| eight counters in every TAD to look across all TADs. |
| The occurrences of events are aggregated and presented to the user |
| at the end of running the workload. The driver does not provide a |
| way for the user to partition TADs so that different TADs are used for |
| different applications. |
| |
| The performance events reflect various internal or interface activities. |
| By combining the values from multiple performance counters, cache |
| performance can be measured in terms such as: cache miss rate, cache |
| allocations, interface retry rate, internal resource occupancy, etc. |
| |
| The PMU driver exposes the available events and format options under sysfs:: |
| |
| /sys/bus/event_source/devices/tad/events/ |
| /sys/bus/event_source/devices/tad/format/ |
| |
| Examples:: |
| |
| $ perf list | grep tad |
| tad/tad_alloc_any/ [Kernel PMU event] |
| tad/tad_alloc_dtg/ [Kernel PMU event] |
| tad/tad_alloc_ltg/ [Kernel PMU event] |
| tad/tad_hit_any/ [Kernel PMU event] |
| tad/tad_hit_dtg/ [Kernel PMU event] |
| tad/tad_hit_ltg/ [Kernel PMU event] |
| tad/tad_req_msh_in_exlmn/ [Kernel PMU event] |
| tad/tad_tag_rd/ [Kernel PMU event] |
| tad/tad_tot_cycle/ [Kernel PMU event] |
| |
| $ perf stat -e tad_alloc_dtg,tad_alloc_ltg,tad_alloc_any,tad_hit_dtg,tad_hit_ltg,tad_hit_any,tad_tag_rd <workload> |
