Hi, On Wed, Dec 30, 2020 at 6:42 AM Song Liu <songliubrav...@fb.com> wrote: > > Introduce perf-stat -b option, which counts events for BPF programs, like: > > [root@localhost ~]# ~/perf stat -e ref-cycles,cycles -b 254 -I 1000 > 1.487903822 115,200 ref-cycles > 1.487903822 86,012 cycles > 2.489147029 80,560 ref-cycles > 2.489147029 73,784 cycles > 3.490341825 60,720 ref-cycles > 3.490341825 37,797 cycles > 4.491540887 37,120 ref-cycles > 4.491540887 31,963 cycles > > The example above counts cycles and ref-cycles of BPF program of id 254. > This is similar to bpftool-prog-profile command, but more flexible. > > perf-stat -b creates per-cpu perf_event and loads fentry/fexit BPF > programs (monitor-progs) to the target BPF program (target-prog). The > monitor-progs read perf_event before and after the target-prog, and > aggregate the difference in a BPF map. Then the user space reads data > from these maps. > > A new struct bpf_counter is introduced to provide common interface that > uses BPF programs/maps to count perf events.
Acked-by: Namhyung Kim <namhy...@kernel.org> Thanks, Namhyung
