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Currently, when 'perf test' is run by a normal user, it'll fail to access tracepoint events. The output becomes somewhat messy because it tries to be nice with long error messages and hints. IMHO this is not needed for 'perf test' by default and AFAIK 'perf test' uses pr_debug() rather than pr_err() for such messages so that one can use -v option to see further details on failed testcases if needed. Before: $ perf test 1: vmlinux symtab matches kallsyms : FAILED! 2: detect openat syscall event :Error: No permissions to read /sys/kernel/debug/tracing/events/syscalls/sys_enter_openat Hint: Try 'sudo mount -o remount,mode=755 /sys/kernel/debug/tracing' FAILED! 3: detect openat syscall event on all cpus :Error: No permissions to read /sys/kernel/debug/tracing/events/syscalls/sys_enter_openat Hint: Try 'sudo mount -o remount,mode=755 /sys/kernel/debug/tracing' FAILED! ... After: $ perf test 1: vmlinux symtab matches kallsyms : FAILED! 2: detect openat syscall event : FAILED! 3: detect openat syscall event on all cpus : FAILED! ... $ perf test -v 2 2: detect openat syscall event : --- start --- test child forked, pid 30575 Error: No permissions to read /sys/kernel/debug/tracing/events/syscalls/sys_enter_openat Hint: Try 'sudo mount -o remount,mode=755 /sys/kernel/debug/tracing' test child finished with -1 ---- end ---- detect openat syscall event: FAILED! Signed-off-by: Namhyung Kim <namhyung@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Acked-by: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/r/1445268229-1601-1-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
123 lines
2.6 KiB
C
123 lines
2.6 KiB
C
#include <linux/err.h>
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#include "perf.h"
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#include "evlist.h"
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#include "evsel.h"
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#include "thread_map.h"
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#include "tests.h"
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#include "debug.h"
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int test__syscall_openat_tp_fields(void)
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{
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struct record_opts opts = {
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.target = {
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.uid = UINT_MAX,
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.uses_mmap = true,
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},
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.no_buffering = true,
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.freq = 1,
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.mmap_pages = 256,
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.raw_samples = true,
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};
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const char *filename = "/etc/passwd";
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int flags = O_RDONLY | O_DIRECTORY;
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struct perf_evlist *evlist = perf_evlist__new();
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struct perf_evsel *evsel;
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int err = -1, i, nr_events = 0, nr_polls = 0;
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char sbuf[STRERR_BUFSIZE];
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if (evlist == NULL) {
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pr_debug("%s: perf_evlist__new\n", __func__);
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goto out;
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}
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evsel = perf_evsel__newtp("syscalls", "sys_enter_openat");
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if (IS_ERR(evsel)) {
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pr_debug("%s: perf_evsel__newtp\n", __func__);
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goto out_delete_evlist;
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}
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perf_evlist__add(evlist, evsel);
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err = perf_evlist__create_maps(evlist, &opts.target);
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if (err < 0) {
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pr_debug("%s: perf_evlist__create_maps\n", __func__);
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goto out_delete_evlist;
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}
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perf_evsel__config(evsel, &opts);
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thread_map__set_pid(evlist->threads, 0, getpid());
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err = perf_evlist__open(evlist);
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if (err < 0) {
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pr_debug("perf_evlist__open: %s\n",
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strerror_r(errno, sbuf, sizeof(sbuf)));
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goto out_delete_evlist;
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}
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err = perf_evlist__mmap(evlist, UINT_MAX, false);
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if (err < 0) {
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pr_debug("perf_evlist__mmap: %s\n",
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strerror_r(errno, sbuf, sizeof(sbuf)));
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goto out_delete_evlist;
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}
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perf_evlist__enable(evlist);
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/*
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* Generate the event:
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*/
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openat(AT_FDCWD, filename, flags);
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while (1) {
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int before = nr_events;
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for (i = 0; i < evlist->nr_mmaps; i++) {
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union perf_event *event;
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while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
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const u32 type = event->header.type;
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int tp_flags;
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struct perf_sample sample;
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++nr_events;
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if (type != PERF_RECORD_SAMPLE) {
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perf_evlist__mmap_consume(evlist, i);
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continue;
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}
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err = perf_evsel__parse_sample(evsel, event, &sample);
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if (err) {
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pr_debug("Can't parse sample, err = %d\n", err);
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goto out_delete_evlist;
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}
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tp_flags = perf_evsel__intval(evsel, &sample, "flags");
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if (flags != tp_flags) {
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pr_debug("%s: Expected flags=%#x, got %#x\n",
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__func__, flags, tp_flags);
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goto out_delete_evlist;
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}
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goto out_ok;
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}
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}
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if (nr_events == before)
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perf_evlist__poll(evlist, 10);
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if (++nr_polls > 5) {
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pr_debug("%s: no events!\n", __func__);
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goto out_delete_evlist;
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}
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}
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out_ok:
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err = 0;
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out_delete_evlist:
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perf_evlist__delete(evlist);
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out:
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return err;
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}
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