28 static int count_samples(struct perf_evlist *evlist, int *sample_count,  in count_samples()  argument
33 	for (i = 0; i < evlist->nr_mmaps; i++) {  in count_samples()
34 		struct perf_mmap *map = &evlist->overwrite_mmap[i];  in count_samples()
58 static int do_test(struct perf_evlist *evlist, int mmap_pages,  in do_test()  argument
64 	err = perf_evlist__mmap(evlist, mmap_pages);  in do_test()
71 	perf_evlist__enable(evlist);  in do_test()
73 	perf_evlist__disable(evlist);  in do_test()
75 	err = count_samples(evlist, sample_count, comm_count);  in do_test()
76 	perf_evlist__munmap(evlist);  in do_test()
85 	struct perf_evlist *evlist;  in test__backward_ring_buffer()  local
102 	evlist = perf_evlist__new();  in test__backward_ring_buffer()
103 	if (!evlist) {  in test__backward_ring_buffer()
108 	err = perf_evlist__create_maps(evlist, &opts.target);  in test__backward_ring_buffer()
119 	err = parse_events(evlist, "syscalls:sys_enter_prctl/overwrite/", &parse_error);  in test__backward_ring_buffer()
126 	perf_evlist__config(evlist, &opts, NULL);  in test__backward_ring_buffer()
128 	err = perf_evlist__open(evlist);  in test__backward_ring_buffer()
136 	err = do_test(evlist, opts.mmap_pages, &sample_count,  in test__backward_ring_buffer()
147 	err = do_test(evlist, 1, &sample_count, &comm_count);  in test__backward_ring_buffer()
153 	perf_evlist__delete(evlist);  in test__backward_ring_buffer()