On Tue, Aug 30, 2022 at 02:49:16PM -0700, Suren Baghdasaryan wrote: > From: Kent Overstreet <kent.overstreet@xxxxxxxxx> > > This adds the ability to easily instrument code for measuring latency. > To use, add the following to calls to your code, at the start and end of > the event you wish to measure: > > code_tag_time_stats_start(start_time); > code_tag_time_stats_finish(start_time); > > Stastistics will then show up in debugfs under > /sys/kernel/debug/time_stats, listed by file and line number. > > Stastics measured include weighted averages of frequency, duration, max > duration, as well as quantiles. > > This patch also instruments all calls to init_wait and finish_wait, > which includes all calls to wait_event. Example debugfs output: How can't you do this with a simple eBPF script on top of trace_sched_stat_* and friends?
