Messages in this thread | | | Date | Fri, 15 Jan 2021 15:53:11 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [PATCH v7 3/3] perf-stat: enable counting events for BPF programs |
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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 <songliubraving@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 <namhyung@kernel.org>
Applied locally, testing now.
- Arnaldo
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