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perf tools: Show event fd in debug output
It is useful for debug to see file descriptors for each event. Before: $ perf stat -vvv -e cycles,cache-misses ls ... sys_perf_event_open: pid 12146 cpu -1 group_fd -1 flags 0x8 ... sys_perf_event_open: pid 12146 cpu -1 group_fd 3 flags 0x8 sys_perf_event_open failed, error -13 Now: $ perf stat -vvv -e cycles,cache-misses ls ... sys_perf_event_open: pid 12858 cpu -1 group_fd -1 flags 0x8 = 3 ... sys_perf_event_open: pid 12858 cpu -1 group_fd 3 flags 0x8 sys_perf_event_open failed, error -13 Signed-off-by: Jiri Olsa <jolsa@redhat.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: David Ahern <dsahern@gmail.com> Cc: Don Zickus <dzickus@redhat.com> Cc: Joe Mario <jmario@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1479764011-10732-2-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -1481,7 +1481,7 @@ retry_sample_id:
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group_fd = get_group_fd(evsel, cpu, thread);
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retry_open:
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pr_debug2("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx\n",
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pr_debug2("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx",
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pid, cpus->map[cpu], group_fd, flags);
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FD(evsel, cpu, thread) = sys_perf_event_open(&evsel->attr,
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@ -1490,11 +1490,13 @@ retry_open:
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group_fd, flags);
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if (FD(evsel, cpu, thread) < 0) {
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err = -errno;
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pr_debug2("sys_perf_event_open failed, error %d\n",
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pr_debug2("\nsys_perf_event_open failed, error %d\n",
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err);
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goto try_fallback;
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}
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pr_debug2(" = %d\n", FD(evsel, cpu, thread));
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if (evsel->bpf_fd >= 0) {
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int evt_fd = FD(evsel, cpu, thread);
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int bpf_fd = evsel->bpf_fd;
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