static void perf_session__destroy_kernel_maps(struct perf_session *self) { machines__destroy_kernel_maps(&self->machines); }
static int do_test_code_reading(bool try_kcore) { struct machines machines; struct machine *machine; struct thread *thread; struct record_opts opts = { .mmap_pages = UINT_MAX, .user_freq = UINT_MAX, .user_interval = ULLONG_MAX, .freq = 4000, .target = { .uses_mmap = true, }, }; struct state state = { .done_cnt = 0, }; struct thread_map *threads = NULL; struct cpu_map *cpus = NULL; struct perf_evlist *evlist = NULL; struct perf_evsel *evsel = NULL; int err = -1, ret; pid_t pid; struct map *map; bool have_vmlinux, have_kcore, excl_kernel = false; pid = getpid(); machines__init(&machines); machine = &machines.host; ret = machine__create_kernel_maps(machine); if (ret < 0) { pr_debug("machine__create_kernel_maps failed\n"); goto out_err; } /* Force the use of kallsyms instead of vmlinux to try kcore */ if (try_kcore) symbol_conf.kallsyms_name = "/proc/kallsyms"; /* Load kernel map */ map = machine->vmlinux_maps[MAP__FUNCTION]; ret = map__load(map, NULL); if (ret < 0) { pr_debug("map__load failed\n"); goto out_err; } have_vmlinux = dso__is_vmlinux(map->dso); have_kcore = dso__is_kcore(map->dso); /* 2nd time through we just try kcore */ if (try_kcore && !have_kcore) return TEST_CODE_READING_NO_KCORE; /* No point getting kernel events if there is no kernel object */ if (!have_vmlinux && !have_kcore) excl_kernel = true; threads = thread_map__new_by_tid(pid); if (!threads) { pr_debug("thread_map__new_by_tid failed\n"); goto out_err; } ret = perf_event__synthesize_thread_map(NULL, threads, perf_event__process, machine, false); if (ret < 0) { pr_debug("perf_event__synthesize_thread_map failed\n"); goto out_err; } thread = machine__findnew_thread(machine, pid, pid); if (!thread) { pr_debug("machine__findnew_thread failed\n"); goto out_err; } cpus = cpu_map__new(NULL); if (!cpus) { pr_debug("cpu_map__new failed\n"); goto out_err; } while (1) { const char *str; evlist = perf_evlist__new(); if (!evlist) { pr_debug("perf_evlist__new failed\n"); goto out_err; } perf_evlist__set_maps(evlist, cpus, threads); if (excl_kernel) str = "cycles:u"; else str = "cycles"; pr_debug("Parsing event '%s'\n", str); ret = parse_events(evlist, str); if (ret < 0) { pr_debug("parse_events failed\n"); goto out_err; } perf_evlist__config(evlist, &opts); evsel = perf_evlist__first(evlist); evsel->attr.comm = 1; evsel->attr.disabled = 1; evsel->attr.enable_on_exec = 0; ret = perf_evlist__open(evlist); if (ret < 0) { if (!excl_kernel) { excl_kernel = true; perf_evlist__set_maps(evlist, NULL, NULL); perf_evlist__delete(evlist); evlist = NULL; continue; } pr_debug("perf_evlist__open failed\n"); goto out_err; } break; } ret = perf_evlist__mmap(evlist, UINT_MAX, false); if (ret < 0) { pr_debug("perf_evlist__mmap failed\n"); goto out_err; } perf_evlist__enable(evlist); do_something(); perf_evlist__disable(evlist); ret = process_events(machine, evlist, &state); if (ret < 0) goto out_err; if (!have_vmlinux && !have_kcore && !try_kcore) err = TEST_CODE_READING_NO_KERNEL_OBJ; else if (!have_vmlinux && !try_kcore) err = TEST_CODE_READING_NO_VMLINUX; else if (excl_kernel) err = TEST_CODE_READING_NO_ACCESS; else err = TEST_CODE_READING_OK; out_err: if (evlist) { perf_evlist__delete(evlist); } else { cpu_map__delete(cpus); thread_map__delete(threads); } machines__destroy_kernel_maps(&machines); machine__delete_threads(machine); machines__exit(&machines); return err; } int test__code_reading(void) { int ret; ret = do_test_code_reading(false); if (!ret) ret = do_test_code_reading(true); switch (ret) { case TEST_CODE_READING_OK: return 0; case TEST_CODE_READING_NO_VMLINUX: fprintf(stderr, " (no vmlinux)"); return 0; case TEST_CODE_READING_NO_KCORE: fprintf(stderr, " (no kcore)"); return 0; case TEST_CODE_READING_NO_ACCESS: fprintf(stderr, " (no access)"); return 0; case TEST_CODE_READING_NO_KERNEL_OBJ: fprintf(stderr, " (no kernel obj)"); return 0; default: return -1; }; }