On Sun, Feb 19, 2023 at 3:14 AM Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> wrote: > > Em Sat, Feb 18, 2023 at 10:13:23PM -0800, Namhyung Kim escreveu: > > The BPF program will be attached to a perf_event and be triggered when > > it overflows. It'd iterate the filters map and compare the sample > > value according to the expression. If any of them fails, the sample > > would be dropped. > > > > Also it needs to have the corresponding sample data for the expression > > so it compares data->sample_flags with the given value. To access the > > sample data, it uses the bpf_cast_to_kern_ctx() kfunc which was added > > in v6.2 kernel. > > CLANG /tmp/build/perf/util/bpf_skel/.tmp/sample_filter.bpf.o > util/bpf_skel/sample_filter.bpf.c:26:19: error: no member named 'sample_flags' in 'struct perf_sample_data' > if ((kctx->data->sample_flags & entry->flags) == 0) > ~~~~~~~~~~ ^ > 1 error generated. > make[2]: *** [Makefile.perf:1078: /tmp/build/perf/util/bpf_skel/.tmp/sample_filter.bpf.o] Error 1 > make[1]: *** [Makefile.perf:236: sub-make] Error 2 > make: *** [Makefile:113: install-bin] Error 2 > make: Leaving directory '/var/home/acme/git/perf/tools/perf' > > Performance counter stats for 'make -k BUILD_BPF_SKEL=1 CORESIGHT=1 O=/tmp/build/perf -C tools/perf install-bin': Hmm.. strange. In the include/linux/perf_event.h, the perf_sample_data has sample_flags, but vmlinux.h doesn't. Thanks, Namhyung
