On Mon, 18 Nov 2024 08:37:02 +0100 Tomasz Duszynski <tduszyn...@marvell.com> wrote:
> This series adds self monitoring support i.e allows to configure and > read performance measurement unit (PMU) counters in runtime without > using perf utility. This has certain advantages when application runs on > isolated cores running dedicated tasks. > > Events can be read directly using rte_pmu_read() or using dedicated > tracepoint rte_eal_trace_pmu_read(). The latter will cause events to be > stored inside CTF file. > > By design, all enabled events are grouped together and the same group > is attached to lcores that use self monitoring funtionality. > > Events are enabled by names, which need to be read from standard > location under sysfs i.e > > /sys/bus/event_source/devices/PMU/events > > where PMU is a core pmu i.e one measuring cpu events. As of today > raw events are not supported. It would be good to have a working useful example of what and how these could be used. Given that most DPDK applications are poll mode, it is not clear how these could be useful. There is a lot of work that perf does to go from the raw counters to useful data, and without that exposing the raw stuff doesn't seem that useful
