Em Tue, Jan 12, 2021 at 04:35:14PM +0900, Namhyung Kim escreveu: > Hi, > > On Wed, Dec 30, 2020 at 6:42 AM Song Liu <[email protected]> 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 <[email protected]>
Applied locally, testing now. - Arnaldo
